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sysctl changes for v5.19-rc1

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For two kernel releases now kernel/sysctl.c has been being cleaned up
 slowly, since the tables were grossly long, sprinkled with tons of #ifdefs and
 all this caused merge conflicts with one susbystem or another.
 
 This tree was put together to help try to avoid conflicts with these cleanups
 going on different trees at time. So nothing exciting on this pull request,
 just cleanups.
 
 I actually had this sysctl-next tree up since v5.18 but I missed sending a
 pull request for it on time during the last merge window. And so these changes
 have been being soaking up on sysctl-next and so linux-next for a while.
 The last change was merged May 4th.
 
 Most of the compile issues were reported by 0day and fixed.
 
 To help avoid a conflict with bpf folks at Daniel Borkmann's request
 I merged bpf-next/pr/bpf-sysctl into sysctl-next to get the effor which
 moves the BPF sysctls from kernel/sysctl.c to BPF core.
 
 Possible merge conflicts and known resolutions as per linux-next:
 
 bfp:
 https://lkml.kernel.org/r/20220414112812.652190b5@canb.auug.org.au
 
 rcu:
 https://lkml.kernel.org/r/20220420153746.4790d532@canb.auug.org.au
 
 powerpc:
 https://lkml.kernel.org/r/20220520154055.7f964b76@canb.auug.org.au
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Merge tag 'sysctl-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux

Pull sysctl updates from Luis Chamberlain:
 "For two kernel releases now kernel/sysctl.c has been being cleaned up
  slowly, since the tables were grossly long, sprinkled with tons of
  #ifdefs and all this caused merge conflicts with one susbystem or
  another.

  This tree was put together to help try to avoid conflicts with these
  cleanups going on different trees at time. So nothing exciting on this
  pull request, just cleanups.

  Thanks a lot to the Uniontech and Huawei folks for doing some of this
  nasty work"

* tag 'sysctl-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux: (28 commits)
  sched: Fix build warning without CONFIG_SYSCTL
  reboot: Fix build warning without CONFIG_SYSCTL
  kernel/kexec_core: move kexec_core sysctls into its own file
  sysctl: minor cleanup in new_dir()
  ftrace: fix building with SYSCTL=y but DYNAMIC_FTRACE=n
  fs/proc: Introduce list_for_each_table_entry for proc sysctl
  mm: fix unused variable kernel warning when SYSCTL=n
  latencytop: move sysctl to its own file
  ftrace: fix building with SYSCTL=n but DYNAMIC_FTRACE=y
  ftrace: Fix build warning
  ftrace: move sysctl_ftrace_enabled to ftrace.c
  kernel/do_mount_initrd: move real_root_dev sysctls to its own file
  kernel/delayacct: move delayacct sysctls to its own file
  kernel/acct: move acct sysctls to its own file
  kernel/panic: move panic sysctls to its own file
  kernel/lockdep: move lockdep sysctls to its own file
  mm: move page-writeback sysctls to their own file
  mm: move oom_kill sysctls to their own file
  kernel/reboot: move reboot sysctls to its own file
  sched: Move energy_aware sysctls to topology.c
  ...
This commit is contained in:
Linus Torvalds 2022-05-26 16:57:20 -07:00
commit 44d35720c9
31 changed files with 741 additions and 610 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

87
fs/proc/proc_sysctl.c
View File

@ -19,6 +19,9 @@
#include <linux/kmemleak.h>
#include "internal.h"
#define list_for_each_table_entry(entry, table) \
for ((entry) = (table); (entry)->procname; (entry)++)
static const struct dentry_operations proc_sys_dentry_operations;
static const struct file_operations proc_sys_file_operations;
static const struct inode_operations proc_sys_inode_operations;
@ -215,15 +218,19 @@ static void init_header(struct ctl_table_header *head,
INIT_HLIST_HEAD(&head->inodes);
if (node) {
struct ctl_table *entry;
for (entry = table; entry->procname; entry++, node++)
list_for_each_table_entry(entry, table) {
node->header = head;
node++;
}
}
}
static void erase_header(struct ctl_table_header *head)
{
struct ctl_table *entry;
for (entry = head->ctl_table; entry->procname; entry++)
list_for_each_table_entry(entry, head->ctl_table)
erase_entry(head, entry);
}
@ -248,7 +255,7 @@ static int insert_header(struct ctl_dir *dir, struct ctl_table_header *header)
err = insert_links(header);
if (err)
goto fail_links;
for (entry = header->ctl_table; entry->procname; entry++) {
list_for_each_table_entry(entry, header->ctl_table) {
err = insert_entry(header, entry);
if (err)
goto fail;
@ -978,7 +985,6 @@ static struct ctl_dir *new_dir(struct ctl_table_set *set,
table = (struct ctl_table *)(node + 1);
new_name = (char *)(table + 2);
memcpy(new_name, name, namelen);
new_name[namelen] = '\0';
table[0].procname = new_name;
table[0].mode = S_IFDIR|S_IRUGO|S_IXUGO;
init_header(&new->header, set->dir.header.root, set, node, table);
@ -1130,35 +1136,36 @@ static int sysctl_check_table_array(const char *path, struct ctl_table *table)
static int sysctl_check_table(const char *path, struct ctl_table *table)
{
struct ctl_table *entry;
int err = 0;
for (; table->procname; table++) {
if (table->child)
err |= sysctl_err(path, table, "Not a file");
list_for_each_table_entry(entry, table) {
if (entry->child)
err |= sysctl_err(path, entry, "Not a file");
if ((table->proc_handler == proc_dostring) ||
(table->proc_handler == proc_dointvec) ||
(table->proc_handler == proc_douintvec) ||
(table->proc_handler == proc_douintvec_minmax) ||
(table->proc_handler == proc_dointvec_minmax) ||
(table->proc_handler == proc_dou8vec_minmax) ||
(table->proc_handler == proc_dointvec_jiffies) ||
(table->proc_handler == proc_dointvec_userhz_jiffies) ||
(table->proc_handler == proc_dointvec_ms_jiffies) ||
(table->proc_handler == proc_doulongvec_minmax) ||
(table->proc_handler == proc_doulongvec_ms_jiffies_minmax)) {
if (!table->data)
err |= sysctl_err(path, table, "No data");
if (!table->maxlen)
err |= sysctl_err(path, table, "No maxlen");
if ((entry->proc_handler == proc_dostring) ||
(entry->proc_handler == proc_dointvec) ||
(entry->proc_handler == proc_douintvec) ||
(entry->proc_handler == proc_douintvec_minmax) ||
(entry->proc_handler == proc_dointvec_minmax) ||
(entry->proc_handler == proc_dou8vec_minmax) ||
(entry->proc_handler == proc_dointvec_jiffies) ||
(entry->proc_handler == proc_dointvec_userhz_jiffies) ||
(entry->proc_handler == proc_dointvec_ms_jiffies) ||
(entry->proc_handler == proc_doulongvec_minmax) ||
(entry->proc_handler == proc_doulongvec_ms_jiffies_minmax)) {
if (!entry->data)
err |= sysctl_err(path, entry, "No data");
if (!entry->maxlen)
err |= sysctl_err(path, entry, "No maxlen");
else
err |= sysctl_check_table_array(path, table);
err |= sysctl_check_table_array(path, entry);
}
if (!table->proc_handler)
err |= sysctl_err(path, table, "No proc_handler");
if (!entry->proc_handler)
err |= sysctl_err(path, entry, "No proc_handler");
if ((table->mode & (S_IRUGO|S_IWUGO)) != table->mode)
err |= sysctl_err(path, table, "bogus .mode 0%o",
table->mode);
if ((entry->mode & (S_IRUGO|S_IWUGO)) != entry->mode)
err |= sysctl_err(path, entry, "bogus .mode 0%o",
entry->mode);
}
return err;
}
@ -1174,7 +1181,7 @@ static struct ctl_table_header *new_links(struct ctl_dir *dir, struct ctl_table
name_bytes = 0;
nr_entries = 0;
for (entry = table; entry->procname; entry++) {
list_for_each_table_entry(entry, table) {
nr_entries++;
name_bytes += strlen(entry->procname) + 1;
}
@ -1191,14 +1198,16 @@ static struct ctl_table_header *new_links(struct ctl_dir *dir, struct ctl_table
node = (struct ctl_node *)(links + 1);
link_table = (struct ctl_table *)(node + nr_entries);
link_name = (char *)&link_table[nr_entries + 1];
link = link_table;
for (link = link_table, entry = table; entry->procname; link++, entry++) {
list_for_each_table_entry(entry, table) {
int len = strlen(entry->procname) + 1;
memcpy(link_name, entry->procname, len);
link->procname = link_name;
link->mode = S_IFLNK|S_IRWXUGO;
link->data = link_root;
link_name += len;
link++;
}
init_header(links, dir->header.root, dir->header.set, node, link_table);
links->nreg = nr_entries;
@ -1213,7 +1222,7 @@ static bool get_links(struct ctl_dir *dir,
struct ctl_table *entry, *link;
/* Are there links available for every entry in table? */
for (entry = table; entry->procname; entry++) {
list_for_each_table_entry(entry, table) {
const char *procname = entry->procname;
link = find_entry(&head, dir, procname, strlen(procname));
if (!link)
@ -1226,7 +1235,7 @@ static bool get_links(struct ctl_dir *dir,
}
/* The checks passed. Increase the registration count on the links */
for (entry = table; entry->procname; entry++) {
list_for_each_table_entry(entry, table) {
const char *procname = entry->procname;
link = find_entry(&head, dir, procname, strlen(procname));
head->nreg++;
@ -1329,7 +1338,7 @@ struct ctl_table_header *__register_sysctl_table(
struct ctl_node *node;
int nr_entries = 0;
for (entry = table; entry->procname; entry++)
list_for_each_table_entry(entry, table)
nr_entries++;
header = kzalloc(sizeof(struct ctl_table_header) +
@ -1456,7 +1465,7 @@ static int count_subheaders(struct ctl_table *table)
if (!table || !table->procname)
return 1;
for (entry = table; entry->procname; entry++) {
list_for_each_table_entry(entry, table) {
if (entry->child)
nr_subheaders += count_subheaders(entry->child);
else
@ -1475,7 +1484,7 @@ static int register_leaf_sysctl_tables(const char *path, char *pos,
int nr_dirs = 0;
int err = -ENOMEM;
for (entry = table; entry->procname; entry++) {
list_for_each_table_entry(entry, table) {
if (entry->child)
nr_dirs++;
else
@ -1492,7 +1501,9 @@ static int register_leaf_sysctl_tables(const char *path, char *pos,
goto out;
ctl_table_arg = files;
for (new = files, entry = table; entry->procname; entry++) {
new = files;
list_for_each_table_entry(entry, table) {
if (entry->child)
continue;
*new = *entry;
@ -1516,7 +1527,7 @@ static int register_leaf_sysctl_tables(const char *path, char *pos,
}
/* Recurse into the subdirectories. */
for (entry = table; entry->procname; entry++) {
list_for_each_table_entry(entry, table) {
char *child_pos;
if (!entry->child)
@ -1670,7 +1681,7 @@ static void put_links(struct ctl_table_header *header)
if (IS_ERR(core_parent))
return;
for (entry = header->ctl_table; entry->procname; entry++) {
list_for_each_table_entry(entry, header->ctl_table) {
struct ctl_table_header *link_head;
struct ctl_table *link;
const char *name = entry->procname;

1
include/linux/acct.h
View File

@ -21,7 +21,6 @@
#ifdef CONFIG_BSD_PROCESS_ACCT
struct pid_namespace;
extern int acct_parm[]; /* for sysctl */
extern void acct_collect(long exitcode, int group_dead);
extern void acct_process(void);
extern void acct_exit_ns(struct pid_namespace *);

3
include/linux/delayacct.h
View File

@ -61,9 +61,6 @@ extern int delayacct_on; /* Delay accounting turned on/off */
extern struct kmem_cache *delayacct_cache;
extern void delayacct_init(void);
extern int sysctl_delayacct(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
extern void __delayacct_tsk_init(struct task_struct *);
extern void __delayacct_tsk_exit(struct task_struct *);
extern void __delayacct_blkio_start(void);

3
include/linux/ftrace.h
View File

@ -101,9 +101,6 @@ static inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *val
#ifdef CONFIG_FUNCTION_TRACER
extern int ftrace_enabled;
extern int
ftrace_enable_sysctl(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS

2
include/linux/initrd.h
View File

@ -29,8 +29,6 @@ static inline void wait_for_initramfs(void) {}
extern phys_addr_t phys_initrd_start;
extern unsigned long phys_initrd_size;
extern unsigned int real_root_dev;
extern char __initramfs_start[];
extern unsigned long __initramfs_size;

3
include/linux/latencytop.h
View File

@ -38,9 +38,6 @@ account_scheduler_latency(struct task_struct *task, int usecs, int inter)
void clear_tsk_latency_tracing(struct task_struct *p);
int sysctl_latencytop(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
#else
static inline void

4
include/linux/lockdep.h
View File

@ -16,10 +16,6 @@
struct task_struct;
/* for sysctl */
extern int prove_locking;
extern int lock_stat;
#ifdef CONFIG_LOCKDEP
#include <linux/linkage.h>

4
include/linux/oom.h
View File

@ -123,8 +123,4 @@ extern void oom_killer_enable(void);
extern struct task_struct *find_lock_task_mm(struct task_struct *p);
/* sysctls */
extern int sysctl_oom_dump_tasks;
extern int sysctl_oom_kill_allocating_task;
extern int sysctl_panic_on_oom;
#endif /* _INCLUDE_LINUX_OOM_H */

6
include/linux/panic.h
View File

@ -15,12 +15,6 @@ extern void oops_enter(void);
extern void oops_exit(void);
extern bool oops_may_print(void);
#ifdef CONFIG_SMP
extern unsigned int sysctl_oops_all_cpu_backtrace;
#else
#define sysctl_oops_all_cpu_backtrace 0
#endif /* CONFIG_SMP */
extern int panic_timeout;
extern unsigned long panic_print;
extern int panic_on_oops;

4
include/linux/reboot.h
View File

@ -71,12 +71,8 @@ extern void kernel_restart(char *cmd);
extern void kernel_halt(void);
extern void kernel_power_off(void);
extern int C_A_D; /* for sysctl */
void ctrl_alt_del(void);
#define POWEROFF_CMD_PATH_LEN 256
extern char poweroff_cmd[POWEROFF_CMD_PATH_LEN];
extern void orderly_poweroff(bool force);
extern void orderly_reboot(void);
void hw_protection_shutdown(const char *reason, int ms_until_forced);

41
include/linux/sched/sysctl.h
View File

@ -14,8 +14,6 @@ extern unsigned long sysctl_hung_task_timeout_secs;
enum { sysctl_hung_task_timeout_secs = 0 };
#endif
extern unsigned int sysctl_sched_child_runs_first;
enum sched_tunable_scaling {
SCHED_TUNABLESCALING_NONE,
SCHED_TUNABLESCALING_LOG,
@ -33,46 +31,7 @@ extern int sysctl_numa_balancing_mode;
#define sysctl_numa_balancing_mode 0
#endif
/*
* control realtime throttling:
*
* /proc/sys/kernel/sched_rt_period_us
* /proc/sys/kernel/sched_rt_runtime_us
*/
extern unsigned int sysctl_sched_rt_period;
extern int sysctl_sched_rt_runtime;
extern unsigned int sysctl_sched_dl_period_max;
extern unsigned int sysctl_sched_dl_period_min;
#ifdef CONFIG_UCLAMP_TASK
extern unsigned int sysctl_sched_uclamp_util_min;
extern unsigned int sysctl_sched_uclamp_util_max;
extern unsigned int sysctl_sched_uclamp_util_min_rt_default;
#endif
#ifdef CONFIG_CFS_BANDWIDTH
extern unsigned int sysctl_sched_cfs_bandwidth_slice;
#endif
extern int sysctl_sched_rr_timeslice;
extern int sched_rr_timeslice;
int sched_rr_handler(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
int sched_rt_handler(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
int sysctl_numa_balancing(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
int sysctl_schedstats(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
extern unsigned int sysctl_sched_energy_aware;
int sched_energy_aware_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
#endif
#endif /* _LINUX_SCHED_SYSCTL_H */

15
include/linux/writeback.h
View File

@ -352,28 +352,13 @@ void wb_domain_exit(struct wb_domain *dom);
extern struct wb_domain global_wb_domain;
/* These are exported to sysctl. */
extern int dirty_background_ratio;
extern unsigned long dirty_background_bytes;
extern int vm_dirty_ratio;
extern unsigned long vm_dirty_bytes;
extern unsigned int dirty_writeback_interval;
extern unsigned int dirty_expire_interval;
extern unsigned int dirtytime_expire_interval;
extern int vm_highmem_is_dirtyable;
extern int laptop_mode;
int dirty_background_ratio_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
int dirty_background_bytes_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
int dirty_ratio_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
int dirty_bytes_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
int dirtytime_interval_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty);
unsigned long wb_calc_thresh(struct bdi_writeback *wb, unsigned long thresh);

22
init/do_mounts_initrd.c
View File

@ -14,12 +14,32 @@
unsigned long initrd_start, initrd_end;
int initrd_below_start_ok;
unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
static unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
static int __initdata mount_initrd = 1;
phys_addr_t phys_initrd_start __initdata;
unsigned long phys_initrd_size __initdata;
#ifdef CONFIG_SYSCTL
static struct ctl_table kern_do_mounts_initrd_table[] = {
{
.procname = "real-root-dev",
.data = &real_root_dev,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{ }
};
static __init int kernel_do_mounts_initrd_sysctls_init(void)
{
register_sysctl_init("kernel", kern_do_mounts_initrd_table);
return 0;
}
late_initcall(kernel_do_mounts_initrd_sysctls_init);
#endif /* CONFIG_SYSCTL */
static int __init no_initrd(char *str)
{
mount_initrd = 0;

22
kernel/acct.c
View File

@ -70,11 +70,31 @@
* Turned into sysctl-controllable parameters. AV, 12/11/98
*/
int acct_parm[3] = {4, 2, 30};
static int acct_parm[3] = {4, 2, 30};
#define RESUME (acct_parm[0]) /* >foo% free space - resume */
#define SUSPEND (acct_parm[1]) /* <foo% free space - suspend */
#define ACCT_TIMEOUT (acct_parm[2]) /* foo second timeout between checks */
#ifdef CONFIG_SYSCTL
static struct ctl_table kern_acct_table[] = {
{
.procname = "acct",
.data = &acct_parm,
.maxlen = 3*sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{ }
};
static __init int kernel_acct_sysctls_init(void)
{
register_sysctl_init("kernel", kern_acct_table);
return 0;
}
late_initcall(kernel_acct_sysctls_init);
#endif /* CONFIG_SYSCTL */
/*
* External references and all of the globals.
*/

22
kernel/delayacct.c
View File

@ -44,7 +44,7 @@ void delayacct_init(void)
}
#ifdef CONFIG_PROC_SYSCTL
int sysctl_delayacct(struct ctl_table *table, int write, void *buffer,
static int sysctl_delayacct(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
int state = delayacct_on;
@ -63,6 +63,26 @@ int sysctl_delayacct(struct ctl_table *table, int write, void *buffer,
set_delayacct(state);
return err;
}
static struct ctl_table kern_delayacct_table[] = {
{
.procname = "task_delayacct",
.data = NULL,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sysctl_delayacct,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
{ }
};
static __init int kernel_delayacct_sysctls_init(void)
{
register_sysctl_init("kernel", kern_delayacct_table);
return 0;
}
late_initcall(kernel_delayacct_sysctls_init);
#endif
void __delayacct_tsk_init(struct task_struct *tsk)

22
kernel/kexec_core.c
View File

@ -936,6 +936,28 @@ int kimage_load_segment(struct kimage *image,
struct kimage *kexec_image;
struct kimage *kexec_crash_image;
int kexec_load_disabled;
#ifdef CONFIG_SYSCTL
static struct ctl_table kexec_core_sysctls[] = {
{
.procname = "kexec_load_disabled",
.data = &kexec_load_disabled,
.maxlen = sizeof(int),
.mode = 0644,
/* only handle a transition from default "0" to "1" */
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ONE,
.extra2 = SYSCTL_ONE,
},
{ }
};
static int __init kexec_core_sysctl_init(void)
{
register_sysctl_init("kernel", kexec_core_sysctls);
return 0;
}
late_initcall(kexec_core_sysctl_init);
#endif
/*
* No panic_cpu check version of crash_kexec(). This function is called

41
kernel/latencytop.c
View File

@ -55,6 +55,7 @@
#include <linux/sched/stat.h>
#include <linux/list.h>
#include <linux/stacktrace.h>
#include <linux/sysctl.h>
static DEFINE_RAW_SPINLOCK(latency_lock);
@ -63,6 +64,31 @@ static struct latency_record latency_record[MAXLR];
int latencytop_enabled;
#ifdef CONFIG_SYSCTL
static int sysctl_latencytop(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
int err;
err = proc_dointvec(table, write, buffer, lenp, ppos);
if (latencytop_enabled)
force_schedstat_enabled();
return err;
}
static struct ctl_table latencytop_sysctl[] = {
{
.procname = "latencytop",
.data = &latencytop_enabled,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = sysctl_latencytop,
},
{}
};
#endif
void clear_tsk_latency_tracing(struct task_struct *p)
{
unsigned long flags;
@ -266,18 +292,9 @@ static const struct proc_ops lstats_proc_ops = {
static int __init init_lstats_procfs(void)
{
proc_create("latency_stats", 0644, NULL, &lstats_proc_ops);
#ifdef CONFIG_SYSCTL
register_sysctl_init("kernel", latencytop_sysctl);
#endif
return 0;
}
int sysctl_latencytop(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
int err;
err = proc_dointvec(table, write, buffer, lenp, ppos);
if (latencytop_enabled)
force_schedstat_enabled();
return err;
}
device_initcall(init_lstats_procfs);

35
kernel/locking/lockdep.c
View File

@ -63,19 +63,50 @@
#include <trace/events/lock.h>
#ifdef CONFIG_PROVE_LOCKING
int prove_locking = 1;
static int prove_locking = 1;
module_param(prove_locking, int, 0644);
#else
#define prove_locking 0
#endif
#ifdef CONFIG_LOCK_STAT
int lock_stat = 1;
static int lock_stat = 1;
module_param(lock_stat, int, 0644);
#else
#define lock_stat 0
#endif
#ifdef CONFIG_SYSCTL
static struct ctl_table kern_lockdep_table[] = {
#ifdef CONFIG_PROVE_LOCKING
{
.procname = "prove_locking",
.data = &prove_locking,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif /* CONFIG_PROVE_LOCKING */
#ifdef CONFIG_LOCK_STAT
{
.procname = "lock_stat",
.data = &lock_stat,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif /* CONFIG_LOCK_STAT */
{ }
};
static __init int kernel_lockdep_sysctls_init(void)
{
register_sysctl_init("kernel", kern_lockdep_table);
return 0;
}
late_initcall(kernel_lockdep_sysctls_init);
#endif /* CONFIG_SYSCTL */
DEFINE_PER_CPU(unsigned int, lockdep_recursion);
EXPORT_PER_CPU_SYMBOL_GPL(lockdep_recursion);

26
kernel/panic.c
View File

@ -43,7 +43,9 @@
* Should we dump all CPUs backtraces in an oops event?
* Defaults to 0, can be changed via sysctl.
*/
unsigned int __read_mostly sysctl_oops_all_cpu_backtrace;
static unsigned int __read_mostly sysctl_oops_all_cpu_backtrace;
#else
#define sysctl_oops_all_cpu_backtrace 0
#endif /* CONFIG_SMP */
int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE;
@ -73,6 +75,28 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
EXPORT_SYMBOL(panic_notifier_list);
#if defined(CONFIG_SMP) && defined(CONFIG_SYSCTL)
static struct ctl_table kern_panic_table[] = {
{
.procname = "oops_all_cpu_backtrace",
.data = &sysctl_oops_all_cpu_backtrace,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
{ }
};
static __init int kernel_panic_sysctls_init(void)
{
register_sysctl_init("kernel", kern_panic_table);
return 0;
}
late_initcall(kernel_panic_sysctls_init);
#endif
static long no_blink(int state)
{
return 0;

2
kernel/rcu/rcu.h
View File

@ -23,6 +23,8 @@
#define RCU_SEQ_CTR_SHIFT 2
#define RCU_SEQ_STATE_MASK ((1 << RCU_SEQ_CTR_SHIFT) - 1)
extern int sysctl_sched_rt_runtime;
/*
* Return the counter portion of a sequence number previously returned
* by rcu_seq_snap() or rcu_seq_current().

34
kernel/reboot.c
View File

@ -23,7 +23,7 @@
* this indicates whether you can reboot with ctrl-alt-del: the default is yes
*/
int C_A_D = 1;
static int C_A_D = 1;
struct pid *cad_pid;
EXPORT_SYMBOL(cad_pid);
@ -417,7 +417,8 @@ void ctrl_alt_del(void)
kill_cad_pid(SIGINT, 1);
}
char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
#define POWEROFF_CMD_PATH_LEN 256
static char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
static const char reboot_cmd[] = "/sbin/reboot";
static int run_cmd(const char *cmd)
@ -879,6 +880,33 @@ static struct attribute *reboot_attrs[] = {
NULL,
};
#ifdef CONFIG_SYSCTL
static struct ctl_table kern_reboot_table[] = {
{
.procname = "poweroff_cmd",
.data = &poweroff_cmd,
.maxlen = POWEROFF_CMD_PATH_LEN,
.mode = 0644,
.proc_handler = proc_dostring,
},
{
.procname = "ctrl-alt-del",
.data = &C_A_D,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{ }
};
static void __init kernel_reboot_sysctls_init(void)
{
register_sysctl_init("kernel", kern_reboot_table);
}
#else
#define kernel_reboot_sysctls_init() do { } while (0)
#endif /* CONFIG_SYSCTL */
static const struct attribute_group reboot_attr_group = {
.attrs = reboot_attrs,
};
@ -898,6 +926,8 @@ static int __init reboot_ksysfs_init(void)
return ret;
}
kernel_reboot_sysctls_init();
return 0;
}
late_initcall(reboot_ksysfs_init);

130
kernel/sched/core.c
View File

@ -148,12 +148,6 @@ const_debug unsigned int sysctl_sched_nr_migrate = 8;
const_debug unsigned int sysctl_sched_nr_migrate = 32;
#endif
/*
* period over which we measure -rt task CPU usage in us.
* default: 1s
*/
unsigned int sysctl_sched_rt_period = 1000000;
__read_mostly int scheduler_running;
#ifdef CONFIG_SCHED_CORE
@ -447,13 +441,6 @@ sched_core_dequeue(struct rq *rq, struct task_struct *p, int flags) { }
#endif /* CONFIG_SCHED_CORE */
/*
* part of the period that we allow rt tasks to run in us.
* default: 0.95s
*/
int sysctl_sched_rt_runtime = 950000;
/*
* Serialization rules:
*
@ -1322,10 +1309,10 @@ static void set_load_weight(struct task_struct *p, bool update_load)
static DEFINE_MUTEX(uclamp_mutex);
/* Max allowed minimum utilization */
unsigned int sysctl_sched_uclamp_util_min = SCHED_CAPACITY_SCALE;
static unsigned int __maybe_unused sysctl_sched_uclamp_util_min = SCHED_CAPACITY_SCALE;
/* Max allowed maximum utilization */
unsigned int sysctl_sched_uclamp_util_max = SCHED_CAPACITY_SCALE;
static unsigned int __maybe_unused sysctl_sched_uclamp_util_max = SCHED_CAPACITY_SCALE;
/*
* By default RT tasks run at the maximum performance point/capacity of the
@ -1342,7 +1329,7 @@ unsigned int sysctl_sched_uclamp_util_max = SCHED_CAPACITY_SCALE;
* This knob will not override the system default sched_util_clamp_min defined
* above.
*/
unsigned int sysctl_sched_uclamp_util_min_rt_default = SCHED_CAPACITY_SCALE;
static unsigned int sysctl_sched_uclamp_util_min_rt_default = SCHED_CAPACITY_SCALE;
/* All clamps are required to be less or equal than these values */
static struct uclamp_se uclamp_default[UCLAMP_CNT];
@ -1472,33 +1459,6 @@ static void uclamp_update_util_min_rt_default(struct task_struct *p)
task_rq_unlock(rq, p, &rf);
}
static void uclamp_sync_util_min_rt_default(void)
{
struct task_struct *g, *p;
/*
* copy_process() sysctl_uclamp
* uclamp_min_rt = X;
* write_lock(&tasklist_lock) read_lock(&tasklist_lock)
* // link thread smp_mb__after_spinlock()
* write_unlock(&tasklist_lock) read_unlock(&tasklist_lock);
* sched_post_fork() for_each_process_thread()
* __uclamp_sync_rt() __uclamp_sync_rt()
*
* Ensures that either sched_post_fork() will observe the new
* uclamp_min_rt or for_each_process_thread() will observe the new
* task.
*/
read_lock(&tasklist_lock);
smp_mb__after_spinlock();
read_unlock(&tasklist_lock);
rcu_read_lock();
for_each_process_thread(g, p)
uclamp_update_util_min_rt_default(p);
rcu_read_unlock();
}
static inline struct uclamp_se
uclamp_tg_restrict(struct task_struct *p, enum uclamp_id clamp_id)
{
@ -1778,6 +1738,11 @@ uclamp_update_active_tasks(struct cgroup_subsys_state *css)
}
static void cpu_util_update_eff(struct cgroup_subsys_state *css);
#endif
#ifdef CONFIG_SYSCTL
#ifdef CONFIG_UCLAMP_TASK
#ifdef CONFIG_UCLAMP_TASK_GROUP
static void uclamp_update_root_tg(void)
{
struct task_group *tg = &root_task_group;
@ -1795,7 +1760,34 @@ static void uclamp_update_root_tg(void)
static void uclamp_update_root_tg(void) { }
#endif
int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
static void uclamp_sync_util_min_rt_default(void)
{
struct task_struct *g, *p;
/*
* copy_process() sysctl_uclamp
* uclamp_min_rt = X;
* write_lock(&tasklist_lock) read_lock(&tasklist_lock)
* // link thread smp_mb__after_spinlock()
* write_unlock(&tasklist_lock) read_unlock(&tasklist_lock);
* sched_post_fork() for_each_process_thread()
* __uclamp_sync_rt() __uclamp_sync_rt()
*
* Ensures that either sched_post_fork() will observe the new
* uclamp_min_rt or for_each_process_thread() will observe the new
* task.
*/
read_lock(&tasklist_lock);
smp_mb__after_spinlock();
read_unlock(&tasklist_lock);
rcu_read_lock();
for_each_process_thread(g, p)
uclamp_update_util_min_rt_default(p);
rcu_read_unlock();
}
static int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
bool update_root_tg = false;
@ -1859,6 +1851,8 @@ done:
return result;
}
#endif
#endif
static int uclamp_validate(struct task_struct *p,
const struct sched_attr *attr)
@ -4433,7 +4427,7 @@ out:
__setup("schedstats=", setup_schedstats);
#ifdef CONFIG_PROC_SYSCTL
int sysctl_schedstats(struct ctl_table *table, int write, void *buffer,
static int sysctl_schedstats(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
struct ctl_table t;
@ -4455,6 +4449,52 @@ int sysctl_schedstats(struct ctl_table *table, int write, void *buffer,
#endif /* CONFIG_PROC_SYSCTL */
#endif /* CONFIG_SCHEDSTATS */
#ifdef CONFIG_SYSCTL
static struct ctl_table sched_core_sysctls[] = {
#ifdef CONFIG_SCHEDSTATS
{
.procname = "sched_schedstats",
.data = NULL,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sysctl_schedstats,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
#endif /* CONFIG_SCHEDSTATS */
#ifdef CONFIG_UCLAMP_TASK
{
.procname = "sched_util_clamp_min",
.data = &sysctl_sched_uclamp_util_min,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sysctl_sched_uclamp_handler,
},
{
.procname = "sched_util_clamp_max",
.data = &sysctl_sched_uclamp_util_max,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sysctl_sched_uclamp_handler,
},
{
.procname = "sched_util_clamp_min_rt_default",
.data = &sysctl_sched_uclamp_util_min_rt_default,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sysctl_sched_uclamp_handler,
},
#endif /* CONFIG_UCLAMP_TASK */
{}
};
static int __init sched_core_sysctl_init(void)
{
register_sysctl_init("kernel", sched_core_sysctls);
return 0;
}
late_initcall(sched_core_sysctl_init);
#endif /* CONFIG_SYSCTL */
/*
* fork()/clone()-time setup:
*/

42
kernel/sched/deadline.c
View File

@ -16,6 +16,40 @@
* Fabio Checconi <fchecconi@gmail.com>
*/
/*
* Default limits for DL period; on the top end we guard against small util
* tasks still getting ridiculously long effective runtimes, on the bottom end we
* guard against timer DoS.
*/
static unsigned int sysctl_sched_dl_period_max = 1 << 22; /* ~4 seconds */
static unsigned int sysctl_sched_dl_period_min = 100; /* 100 us */
#ifdef CONFIG_SYSCTL
static struct ctl_table sched_dl_sysctls[] = {
{
.procname = "sched_deadline_period_max_us",
.data = &sysctl_sched_dl_period_max,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "sched_deadline_period_min_us",
.data = &sysctl_sched_dl_period_min,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{}
};
static int __init sched_dl_sysctl_init(void)
{
register_sysctl_init("kernel", sched_dl_sysctls);
return 0;
}
late_initcall(sched_dl_sysctl_init);
#endif
static inline struct task_struct *dl_task_of(struct sched_dl_entity *dl_se)
{
return container_of(dl_se, struct task_struct, dl);
@ -2872,14 +2906,6 @@ void __getparam_dl(struct task_struct *p, struct sched_attr *attr)
attr->sched_flags |= dl_se->flags;
}
/*
* Default limits for DL period; on the top end we guard against small util
* tasks still getting ridiculously long effective runtimes, on the bottom end we
* guard against timer DoS.
*/
unsigned int sysctl_sched_dl_period_max = 1 << 22; /* ~4 seconds */
unsigned int sysctl_sched_dl_period_min = 100; /* 100 us */
/*
* This function validates the new parameters of a -deadline task.
* We ask for the deadline not being zero, and greater or equal

32
kernel/sched/fair.c
View File

@ -174,7 +174,37 @@ int __weak arch_asym_cpu_priority(int cpu)
*
* (default: 5 msec, units: microseconds)
*/
unsigned int sysctl_sched_cfs_bandwidth_slice = 5000UL;
static unsigned int sysctl_sched_cfs_bandwidth_slice = 5000UL;
#endif
#ifdef CONFIG_SYSCTL
static struct ctl_table sched_fair_sysctls[] = {
{
.procname = "sched_child_runs_first",
.data = &sysctl_sched_child_runs_first,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#ifdef CONFIG_CFS_BANDWIDTH
{
.procname = "sched_cfs_bandwidth_slice_us",
.data = &sysctl_sched_cfs_bandwidth_slice,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ONE,
},
#endif
{}
};
static int __init sched_fair_sysctl_init(void)
{
register_sysctl_init("kernel", sched_fair_sysctls);
return 0;
}
late_initcall(sched_fair_sysctl_init);
#endif
static inline void update_load_add(struct load_weight *lw, unsigned long inc)

63
kernel/sched/rt.c
View File

@ -5,7 +5,6 @@
*/
int sched_rr_timeslice = RR_TIMESLICE;
int sysctl_sched_rr_timeslice = (MSEC_PER_SEC / HZ) * RR_TIMESLICE;
/* More than 4 hours if BW_SHIFT equals 20. */
static const u64 max_rt_runtime = MAX_BW;
@ -13,6 +12,57 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun);
struct rt_bandwidth def_rt_bandwidth;
/*
* period over which we measure -rt task CPU usage in us.
* default: 1s
*/
unsigned int sysctl_sched_rt_period = 1000000;
/*
* part of the period that we allow rt tasks to run in us.
* default: 0.95s
*/
int sysctl_sched_rt_runtime = 950000;
#ifdef CONFIG_SYSCTL
static int sysctl_sched_rr_timeslice = (MSEC_PER_SEC / HZ) * RR_TIMESLICE;
static int sched_rt_handler(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
static int sched_rr_handler(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
static struct ctl_table sched_rt_sysctls[] = {
{
.procname = "sched_rt_period_us",
.data = &sysctl_sched_rt_period,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sched_rt_handler,
},
{
.procname = "sched_rt_runtime_us",
.data = &sysctl_sched_rt_runtime,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = sched_rt_handler,
},
{
.procname = "sched_rr_timeslice_ms",
.data = &sysctl_sched_rr_timeslice,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = sched_rr_handler,
},
{}
};
static int __init sched_rt_sysctl_init(void)
{
register_sysctl_init("kernel", sched_rt_sysctls);
return 0;
}
late_initcall(sched_rt_sysctl_init);
#endif
static enum hrtimer_restart sched_rt_period_timer(struct hrtimer *timer)
{
struct rt_bandwidth *rt_b =
@ -2862,6 +2912,7 @@ long sched_group_rt_period(struct task_group *tg)
return rt_period_us;
}
#ifdef CONFIG_SYSCTL
static int sched_rt_global_constraints(void)
{
int ret = 0;
@ -2872,6 +2923,7 @@ static int sched_rt_global_constraints(void)
return ret;
}
#endif /* CONFIG_SYSCTL */
int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk)
{
@ -2883,6 +2935,8 @@ int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk)
}
#else /* !CONFIG_RT_GROUP_SCHED */
#ifdef CONFIG_SYSCTL
static int sched_rt_global_constraints(void)
{
unsigned long flags;
@ -2900,8 +2954,10 @@ static int sched_rt_global_constraints(void)
return 0;
}
#endif /* CONFIG_SYSCTL */
#endif /* CONFIG_RT_GROUP_SCHED */
#ifdef CONFIG_SYSCTL
static int sched_rt_global_validate(void)
{
if (sysctl_sched_rt_period <= 0)
@ -2926,7 +2982,7 @@ static void sched_rt_do_global(void)
raw_spin_unlock_irqrestore(&def_rt_bandwidth.rt_runtime_lock, flags);
}
int sched_rt_handler(struct ctl_table *table, int write, void *buffer,
static int sched_rt_handler(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
int old_period, old_runtime;
@ -2965,7 +3021,7 @@ undo:
return ret;
}
int sched_rr_handler(struct ctl_table *table, int write, void *buffer,
static int sched_rr_handler(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
int ret;
@ -2986,6 +3042,7 @@ int sched_rr_handler(struct ctl_table *table, int write, void *buffer,
return ret;
}
#endif /* CONFIG_SYSCTL */
#ifdef CONFIG_SCHED_DEBUG
void print_rt_stats(struct seq_file *m, int cpu)

7
kernel/sched/sched.h
View File

@ -108,10 +108,17 @@ extern __read_mostly int scheduler_running;
extern unsigned long calc_load_update;
extern atomic_long_t calc_load_tasks;
extern unsigned int sysctl_sched_child_runs_first;
extern void calc_global_load_tick(struct rq *this_rq);
extern long calc_load_fold_active(struct rq *this_rq, long adjust);
extern void call_trace_sched_update_nr_running(struct rq *rq, int count);
extern unsigned int sysctl_sched_rt_period;
extern int sysctl_sched_rt_runtime;
extern int sched_rr_timeslice;
/*
* Helpers for converting nanosecond timing to jiffy resolution
*/

25
kernel/sched/topology.c
View File

@ -206,7 +206,7 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
DEFINE_STATIC_KEY_FALSE(sched_energy_present);
unsigned int sysctl_sched_energy_aware = 1;
static unsigned int sysctl_sched_energy_aware = 1;
DEFINE_MUTEX(sched_energy_mutex);
bool sched_energy_update;
@ -220,7 +220,7 @@ void rebuild_sched_domains_energy(void)
}
#ifdef CONFIG_PROC_SYSCTL
int sched_energy_aware_handler(struct ctl_table *table, int write,
static int sched_energy_aware_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int ret, state;
@ -237,6 +237,27 @@ int sched_energy_aware_handler(struct ctl_table *table, int write,
return ret;
}
static struct ctl_table sched_energy_aware_sysctls[] = {
{
.procname = "sched_energy_aware",
.data = &sysctl_sched_energy_aware,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sched_energy_aware_handler,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
{}
};
static int __init sched_energy_aware_sysctl_init(void)
{
register_sysctl_init("kernel", sched_energy_aware_sysctls);
return 0;
}
late_initcall(sched_energy_aware_sysctl_init);
#endif
static void free_pd(struct perf_domain *pd)

300
kernel/sysctl.c
View File

@ -61,12 +61,9 @@
#include <linux/capability.h>
#include <linux/binfmts.h>
#include <linux/sched/sysctl.h>
#include <linux/kexec.h>
#include <linux/mount.h>
#include <linux/userfaultfd_k.h>
#include <linux/latencytop.h>
#include <linux/pid.h>
#include <linux/delayacct.h>
#include "../lib/kstrtox.h"
@ -81,15 +78,9 @@
#ifdef CONFIG_SPARC
#include <asm/setup.h>
#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
#include <linux/acct.h>
#endif
#ifdef CONFIG_RT_MUTEXES
#include <linux/rtmutex.h>
#endif
#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
#include <linux/lockdep.h>
#endif
#if defined(CONFIG_SYSCTL)
@ -99,8 +90,6 @@
static const int six_hundred_forty_kb = 640 * 1024;
#endif
/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
static const unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
static const int ngroups_max = NGROUPS_MAX;
static const int cap_last_cap = CAP_LAST_CAP;
@ -1598,35 +1587,6 @@ int proc_do_static_key(struct ctl_table *table, int write,
}
static struct ctl_table kern_table[] = {
{
.procname = "sched_child_runs_first",
.data = &sysctl_sched_child_runs_first,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#ifdef CONFIG_SCHEDSTATS
{
.procname = "sched_schedstats",
.data = NULL,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sysctl_schedstats,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
#endif /* CONFIG_SCHEDSTATS */
#ifdef CONFIG_TASK_DELAY_ACCT
{
.procname = "task_delayacct",
.data = NULL,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sysctl_delayacct,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
#endif /* CONFIG_TASK_DELAY_ACCT */
#ifdef CONFIG_NUMA_BALANCING
{
.procname = "numa_balancing",
@ -1638,103 +1598,6 @@ static struct ctl_table kern_table[] = {
.extra2 = SYSCTL_FOUR,
},
#endif /* CONFIG_NUMA_BALANCING */
{
.procname = "sched_rt_period_us",
.data = &sysctl_sched_rt_period,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sched_rt_handler,
},
{
.procname = "sched_rt_runtime_us",
.data = &sysctl_sched_rt_runtime,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = sched_rt_handler,
},
{
.procname = "sched_deadline_period_max_us",
.data = &sysctl_sched_dl_period_max,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "sched_deadline_period_min_us",
.data = &sysctl_sched_dl_period_min,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "sched_rr_timeslice_ms",
.data = &sysctl_sched_rr_timeslice,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = sched_rr_handler,
},
#ifdef CONFIG_UCLAMP_TASK
{
.procname = "sched_util_clamp_min",
.data = &sysctl_sched_uclamp_util_min,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sysctl_sched_uclamp_handler,
},
{
.procname = "sched_util_clamp_max",
.data = &sysctl_sched_uclamp_util_max,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sysctl_sched_uclamp_handler,
},
{
.procname = "sched_util_clamp_min_rt_default",
.data = &sysctl_sched_uclamp_util_min_rt_default,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sysctl_sched_uclamp_handler,
},
#endif
#ifdef CONFIG_CFS_BANDWIDTH
{
.procname = "sched_cfs_bandwidth_slice_us",
.data = &sysctl_sched_cfs_bandwidth_slice,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ONE,
},
#endif
#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
{
.procname = "sched_energy_aware",
.data = &sysctl_sched_energy_aware,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sched_energy_aware_handler,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
#endif
#ifdef CONFIG_PROVE_LOCKING
{
.procname = "prove_locking",
.data = &prove_locking,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
#ifdef CONFIG_LOCK_STAT
{
.procname = "lock_stat",
.data = &lock_stat,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
{
.procname = "panic",
.data = &panic_timeout,
@ -1758,24 +1621,6 @@ static struct ctl_table kern_table[] = {
.extra1 = SYSCTL_NEG_ONE,
.extra2 = SYSCTL_ONE,
},
#endif
#ifdef CONFIG_LATENCYTOP
{
.procname = "latencytop",
.data = &latencytop_enabled,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = sysctl_latencytop,
},
#endif
#ifdef CONFIG_BLK_DEV_INITRD
{
.procname = "real-root-dev",
.data = &real_root_dev,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
{
.procname = "print-fatal-signals",
@ -1833,22 +1678,6 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
{
.procname = "ctrl-alt-del",
.data = &C_A_D,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#ifdef CONFIG_FUNCTION_TRACER
{
.procname = "ftrace_enabled",
.data = &ftrace_enabled,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = ftrace_enable_sysctl,
},
#endif
#ifdef CONFIG_STACK_TRACER
{
@ -1882,18 +1711,6 @@ static struct ctl_table kern_table[] = {
.proc_handler = tracepoint_printk_sysctl,
},
#endif
#ifdef CONFIG_KEXEC_CORE
{
.procname = "kexec_load_disabled",
.data = &kexec_load_disabled,
.maxlen = sizeof(int),
.mode = 0644,
/* only handle a transition from default "0" to "1" */
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ONE,
.extra2 = SYSCTL_ONE,
},
#endif
#ifdef CONFIG_MODULES
{
.procname = "modprobe",
@ -1922,15 +1739,6 @@ static struct ctl_table kern_table[] = {
.proc_handler = proc_dostring,
},
#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
{
.procname = "acct",
.data = &acct_parm,
.maxlen = 3*sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
#ifdef CONFIG_MAGIC_SYSRQ
{
.procname = "sysrq",
@ -1988,17 +1796,6 @@ static struct ctl_table kern_table[] = {
.proc_handler = proc_dointvec,
},
#endif
#ifdef CONFIG_SMP
{
.procname = "oops_all_cpu_backtrace",
.data = &sysctl_oops_all_cpu_backtrace,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
#endif /* CONFIG_SMP */
{
.procname = "pid_max",
.data = &pid_max,
@ -2147,13 +1944,6 @@ static struct ctl_table kern_table[] = {
.proc_handler = proc_dointvec,
},
#endif
{
.procname = "poweroff_cmd",
.data = &poweroff_cmd,
.maxlen = POWEROFF_CMD_PATH_LEN,
.mode = 0644,
.proc_handler = proc_dostring,
},
#ifdef CONFIG_KEYS
{
.procname = "keys",
@ -2262,29 +2052,6 @@ static struct ctl_table vm_table[] = {
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_TWO,
},
{
.procname = "panic_on_oom",
.data = &sysctl_panic_on_oom,
.maxlen = sizeof(sysctl_panic_on_oom),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_TWO,
},
{
.procname = "oom_kill_allocating_task",
.data = &sysctl_oom_kill_allocating_task,
.maxlen = sizeof(sysctl_oom_kill_allocating_task),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "oom_dump_tasks",
.data = &sysctl_oom_dump_tasks,
.maxlen = sizeof(sysctl_oom_dump_tasks),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "overcommit_ratio",
.data = &sysctl_overcommit_ratio,
@ -2307,55 +2074,6 @@ static struct ctl_table vm_table[] = {
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
},
{
.procname = "dirty_background_ratio",
.data = &dirty_background_ratio,
.maxlen = sizeof(dirty_background_ratio),
.mode = 0644,
.proc_handler = dirty_background_ratio_handler,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE_HUNDRED,
},
{
.procname = "dirty_background_bytes",
.data = &dirty_background_bytes,
.maxlen = sizeof(dirty_background_bytes),
.mode = 0644,
.proc_handler = dirty_background_bytes_handler,
.extra1 = SYSCTL_LONG_ONE,
},
{
.procname = "dirty_ratio",
.data = &vm_dirty_ratio,
.maxlen = sizeof(vm_dirty_ratio),
.mode = 0644,
.proc_handler = dirty_ratio_handler,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE_HUNDRED,
},
{
.procname = "dirty_bytes",
.data = &vm_dirty_bytes,
.maxlen = sizeof(vm_dirty_bytes),
.mode = 0644,
.proc_handler = dirty_bytes_handler,
.extra1 = (void *)&dirty_bytes_min,
},
{
.procname = "dirty_writeback_centisecs",
.data = &dirty_writeback_interval,
.maxlen = sizeof(dirty_writeback_interval),
.mode = 0644,
.proc_handler = dirty_writeback_centisecs_handler,
},
{
.procname = "dirty_expire_centisecs",
.data = &dirty_expire_interval,
.maxlen = sizeof(dirty_expire_interval),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
},
{
.procname = "dirtytime_expire_seconds",
.data = &dirtytime_expire_interval,
@ -2527,13 +2245,6 @@ static struct ctl_table vm_table[] = {
.extra1 = SYSCTL_ZERO,
},
#endif
{
.procname = "laptop_mode",
.data = &laptop_mode,
.maxlen = sizeof(laptop_mode),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "vfs_cache_pressure",
.data = &sysctl_vfs_cache_pressure,
@ -2631,17 +2342,6 @@ static struct ctl_table vm_table[] = {
.extra1 = SYSCTL_ZERO,
},
#endif
#ifdef CONFIG_HIGHMEM
{
.procname = "highmem_is_dirtyable",
.data = &vm_highmem_is_dirtyable,
.maxlen = sizeof(vm_highmem_is_dirtyable),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
#endif
#ifdef CONFIG_MEMORY_FAILURE
{
.procname = "memory_failure_early_kill",

211
kernel/trace/ftrace.c
View File

@ -86,7 +86,7 @@ struct ftrace_ops ftrace_list_end __read_mostly = {
/* ftrace_enabled is a method to turn ftrace on or off */
int ftrace_enabled __read_mostly;
static int last_ftrace_enabled;
static int __maybe_unused last_ftrace_enabled;
/* Current function tracing op */
struct ftrace_ops *function_trace_op __read_mostly = &ftrace_list_end;
@ -3065,40 +3065,6 @@ int ftrace_shutdown(struct ftrace_ops *ops, int command)
return 0;
}
static void ftrace_startup_sysctl(void)
{
int command;
if (unlikely(ftrace_disabled))
return;
/* Force update next time */
saved_ftrace_func = NULL;
/* ftrace_start_up is true if we want ftrace running */
if (ftrace_start_up) {
command = FTRACE_UPDATE_CALLS;
if (ftrace_graph_active)
command |= FTRACE_START_FUNC_RET;
ftrace_startup_enable(command);
}
}
static void ftrace_shutdown_sysctl(void)
{
int command;
if (unlikely(ftrace_disabled))
return;
/* ftrace_start_up is true if ftrace is running */
if (ftrace_start_up) {
command = FTRACE_DISABLE_CALLS;
if (ftrace_graph_active)
command |= FTRACE_STOP_FUNC_RET;
ftrace_run_update_code(command);
}
}
static u64 ftrace_update_time;
unsigned long ftrace_update_tot_cnt;
unsigned long ftrace_number_of_pages;
@ -7267,9 +7233,6 @@ core_initcall(ftrace_nodyn_init);
static inline int ftrace_init_dyn_tracefs(struct dentry *d_tracer) { return 0; }
static inline void ftrace_startup_all(int command) { }
# define ftrace_startup_sysctl() do { } while (0)
# define ftrace_shutdown_sysctl() do { } while (0)
static void ftrace_update_trampoline(struct ftrace_ops *ops)
{
}
@ -7909,62 +7872,6 @@ int unregister_ftrace_function(struct ftrace_ops *ops)
}
EXPORT_SYMBOL_GPL(unregister_ftrace_function);
static bool is_permanent_ops_registered(void)
{
struct ftrace_ops *op;
do_for_each_ftrace_op(op, ftrace_ops_list) {
if (op->flags & FTRACE_OPS_FL_PERMANENT)
return true;
} while_for_each_ftrace_op(op);
return false;
}
int
ftrace_enable_sysctl(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int ret = -ENODEV;
mutex_lock(&ftrace_lock);
if (unlikely(ftrace_disabled))
goto out;
ret = proc_dointvec(table, write, buffer, lenp, ppos);
if (ret || !write || (last_ftrace_enabled == !!ftrace_enabled))
goto out;
if (ftrace_enabled) {
/* we are starting ftrace again */
if (rcu_dereference_protected(ftrace_ops_list,
lockdep_is_held(&ftrace_lock)) != &ftrace_list_end)
update_ftrace_function();
ftrace_startup_sysctl();
} else {
if (is_permanent_ops_registered()) {
ftrace_enabled = true;
ret = -EBUSY;
goto out;
}
/* stopping ftrace calls (just send to ftrace_stub) */
ftrace_trace_function = ftrace_stub;
ftrace_shutdown_sysctl();
}
last_ftrace_enabled = !!ftrace_enabled;
out:
mutex_unlock(&ftrace_lock);
return ret;
}
static int symbols_cmp(const void *a, const void *b)
{
const char **str_a = (const char **) a;
@ -8026,3 +7933,119 @@ int ftrace_lookup_symbols(const char **sorted_syms, size_t cnt, unsigned long *a
return err;
return args.found == args.cnt ? 0 : -ESRCH;
}
#ifdef CONFIG_SYSCTL
#ifdef CONFIG_DYNAMIC_FTRACE
static void ftrace_startup_sysctl(void)
{
int command;
if (unlikely(ftrace_disabled))
return;
/* Force update next time */
saved_ftrace_func = NULL;
/* ftrace_start_up is true if we want ftrace running */
if (ftrace_start_up) {
command = FTRACE_UPDATE_CALLS;
if (ftrace_graph_active)
command |= FTRACE_START_FUNC_RET;
ftrace_startup_enable(command);
}
}
static void ftrace_shutdown_sysctl(void)
{
int command;
if (unlikely(ftrace_disabled))
return;
/* ftrace_start_up is true if ftrace is running */
if (ftrace_start_up) {
command = FTRACE_DISABLE_CALLS;
if (ftrace_graph_active)
command |= FTRACE_STOP_FUNC_RET;
ftrace_run_update_code(command);
}
}
#else
# define ftrace_startup_sysctl() do { } while (0)
# define ftrace_shutdown_sysctl() do { } while (0)
#endif /* CONFIG_DYNAMIC_FTRACE */
static bool is_permanent_ops_registered(void)
{
struct ftrace_ops *op;
do_for_each_ftrace_op(op, ftrace_ops_list) {
if (op->flags & FTRACE_OPS_FL_PERMANENT)
return true;
} while_for_each_ftrace_op(op);
return false;
}
static int
ftrace_enable_sysctl(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int ret = -ENODEV;
mutex_lock(&ftrace_lock);
if (unlikely(ftrace_disabled))
goto out;
ret = proc_dointvec(table, write, buffer, lenp, ppos);
if (ret || !write || (last_ftrace_enabled == !!ftrace_enabled))
goto out;
if (ftrace_enabled) {
/* we are starting ftrace again */
if (rcu_dereference_protected(ftrace_ops_list,
lockdep_is_held(&ftrace_lock)) != &ftrace_list_end)
update_ftrace_function();
ftrace_startup_sysctl();
} else {
if (is_permanent_ops_registered()) {
ftrace_enabled = true;
ret = -EBUSY;
goto out;
}
/* stopping ftrace calls (just send to ftrace_stub) */
ftrace_trace_function = ftrace_stub;
ftrace_shutdown_sysctl();
}
last_ftrace_enabled = !!ftrace_enabled;
out:
mutex_unlock(&ftrace_lock);
return ret;
}
static struct ctl_table ftrace_sysctls[] = {
{
.procname = "ftrace_enabled",
.data = &ftrace_enabled,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = ftrace_enable_sysctl,
},
{}
};
static int __init ftrace_sysctl_init(void)
{
register_sysctl_init("kernel", ftrace_sysctls);
return 0;
}
late_initcall(ftrace_sysctl_init);
#endif

38
mm/oom_kill.c
View File

@ -52,9 +52,38 @@
#define CREATE_TRACE_POINTS
#include <trace/events/oom.h>
int sysctl_panic_on_oom;
int sysctl_oom_kill_allocating_task;
int sysctl_oom_dump_tasks = 1;
static int sysctl_panic_on_oom;
static int sysctl_oom_kill_allocating_task;
static int sysctl_oom_dump_tasks = 1;
#ifdef CONFIG_SYSCTL
static struct ctl_table vm_oom_kill_table[] = {
{
.procname = "panic_on_oom",
.data = &sysctl_panic_on_oom,
.maxlen = sizeof(sysctl_panic_on_oom),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_TWO,
},
{
.procname = "oom_kill_allocating_task",
.data = &sysctl_oom_kill_allocating_task,
.maxlen = sizeof(sysctl_oom_kill_allocating_task),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "oom_dump_tasks",
.data = &sysctl_oom_dump_tasks,
.maxlen = sizeof(sysctl_oom_dump_tasks),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{}
};
#endif
/*
* Serializes oom killer invocations (out_of_memory()) from all contexts to
@ -703,6 +732,9 @@ static void queue_oom_reaper(struct task_struct *tsk)
static int __init oom_init(void)
{
oom_reaper_th = kthread_run(oom_reaper, NULL, "oom_reaper");
#ifdef CONFIG_SYSCTL
register_sysctl_init("vm", vm_oom_kill_table);
#endif
return 0;
}
subsys_initcall(oom_init)

104
mm/page-writeback.c
View File

@ -70,30 +70,30 @@ static long ratelimit_pages = 32;
/*
* Start background writeback (via writeback threads) at this percentage
*/
int dirty_background_ratio = 10;
static int dirty_background_ratio = 10;
/*
* dirty_background_bytes starts at 0 (disabled) so that it is a function of
* dirty_background_ratio * the amount of dirtyable memory
*/
unsigned long dirty_background_bytes;
static unsigned long dirty_background_bytes;
/*
* free highmem will not be subtracted from the total free memory
* for calculating free ratios if vm_highmem_is_dirtyable is true
*/
int vm_highmem_is_dirtyable;
static int vm_highmem_is_dirtyable;
/*
* The generator of dirty data starts writeback at this percentage
*/
int vm_dirty_ratio = 20;
static int vm_dirty_ratio = 20;
/*
* vm_dirty_bytes starts at 0 (disabled) so that it is a function of
* vm_dirty_ratio * the amount of dirtyable memory
*/
unsigned long vm_dirty_bytes;
static unsigned long vm_dirty_bytes;
/*
* The interval between `kupdate'-style writebacks
@ -491,7 +491,8 @@ bool node_dirty_ok(struct pglist_data *pgdat)
return nr_pages <= limit;
}
int dirty_background_ratio_handler(struct ctl_table *table, int write,
#ifdef CONFIG_SYSCTL
static int dirty_background_ratio_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int ret;
@ -502,7 +503,7 @@ int dirty_background_ratio_handler(struct ctl_table *table, int write,
return ret;
}
int dirty_background_bytes_handler(struct ctl_table *table, int write,
static int dirty_background_bytes_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int ret;
@ -513,7 +514,7 @@ int dirty_background_bytes_handler(struct ctl_table *table, int write,
return ret;
}
int dirty_ratio_handler(struct ctl_table *table, int write, void *buffer,
static int dirty_ratio_handler(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
int old_ratio = vm_dirty_ratio;
@ -527,7 +528,7 @@ int dirty_ratio_handler(struct ctl_table *table, int write, void *buffer,
return ret;
}
int dirty_bytes_handler(struct ctl_table *table, int write,
static int dirty_bytes_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
unsigned long old_bytes = vm_dirty_bytes;
@ -540,6 +541,7 @@ int dirty_bytes_handler(struct ctl_table *table, int write,
}
return ret;
}
#endif
static unsigned long wp_next_time(unsigned long cur_time)
{
@ -1988,10 +1990,11 @@ bool wb_over_bg_thresh(struct bdi_writeback *wb)
return false;
}
#ifdef CONFIG_SYSCTL
/*
* sysctl handler for /proc/sys/vm/dirty_writeback_centisecs
*/
int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
static int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
void *buffer, size_t *length, loff_t *ppos)
{
unsigned int old_interval = dirty_writeback_interval;
@ -2012,6 +2015,7 @@ int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
return ret;
}
#endif
void laptop_mode_timer_fn(struct timer_list *t)
{
@ -2076,6 +2080,83 @@ static int page_writeback_cpu_online(unsigned int cpu)
return 0;
}
#ifdef CONFIG_SYSCTL
/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
static const unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
static struct ctl_table vm_page_writeback_sysctls[] = {
{
.procname = "dirty_background_ratio",
.data = &dirty_background_ratio,
.maxlen = sizeof(dirty_background_ratio),
.mode = 0644,
.proc_handler = dirty_background_ratio_handler,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE_HUNDRED,
},
{
.procname = "dirty_background_bytes",
.data = &dirty_background_bytes,
.maxlen = sizeof(dirty_background_bytes),
.mode = 0644,
.proc_handler = dirty_background_bytes_handler,
.extra1 = SYSCTL_LONG_ONE,
},
{
.procname = "dirty_ratio",
.data = &vm_dirty_ratio,
.maxlen = sizeof(vm_dirty_ratio),
.mode = 0644,
.proc_handler = dirty_ratio_handler,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE_HUNDRED,
},
{
.procname = "dirty_bytes",
.data = &vm_dirty_bytes,
.maxlen = sizeof(vm_dirty_bytes),
.mode = 0644,
.proc_handler = dirty_bytes_handler,
.extra1 = (void *)&dirty_bytes_min,
},
{
.procname = "dirty_writeback_centisecs",
.data = &dirty_writeback_interval,
.maxlen = sizeof(dirty_writeback_interval),
.mode = 0644,
.proc_handler = dirty_writeback_centisecs_handler,
},
{
.procname = "dirty_expire_centisecs",
.data = &dirty_expire_interval,
.maxlen = sizeof(dirty_expire_interval),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
},
#ifdef CONFIG_HIGHMEM
{
.procname = "highmem_is_dirtyable",
.data = &vm_highmem_is_dirtyable,
.maxlen = sizeof(vm_highmem_is_dirtyable),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
#endif
{
.procname = "laptop_mode",
.data = &laptop_mode,
.maxlen = sizeof(laptop_mode),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{}
};
#endif
/*
* Called early on to tune the page writeback dirty limits.
*
@ -2100,6 +2181,9 @@ void __init page_writeback_init(void)
page_writeback_cpu_online, NULL);
cpuhp_setup_state(CPUHP_MM_WRITEBACK_DEAD, "mm/writeback:dead", NULL,
page_writeback_cpu_online);
#ifdef CONFIG_SYSCTL
register_sysctl_init("vm", vm_page_writeback_sysctls);
#endif
}
/**