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[PATCH] Shrinks sizeof(files_struct) and better layout

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1) Reduce the size of (struct fdtable) to exactly 64 bytes on 32bits
   platforms, lowering kmalloc() allocated space by 50%.

2) Reduce the size of (files_struct), using a special 32 bits (or
   64bits) embedded_fd_set, instead of a 1024 bits fd_set for the
   close_on_exec_init and open_fds_init fields.  This save some ram (248
   bytes per task) as most tasks dont open more than 32 files.  D-Cache
   footprint for such tasks is also reduced to the minimum.

3) Reduce size of allocated fdset.  Currently two full pages are
   allocated, that is 32768 bits on x86 for example, and way too much.  The
   minimum is now L1_CACHE_BYTES.

UP and SMP should benefit from this patch, because most tasks will touch
only one cache line when open()/close() stdin/stdout/stderr (0/1/2),
(next_fd, close_on_exec_init, open_fds_init, fd_array[0 ..  2] being in the
same cache line)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric Dumazet 2006-03-23 03:00:12 -08:00 committed by Linus Torvalds
parent d8733c2956
commit 0c9e63fd38
6 changed files with 55 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
fs/fcntl.c
View File

@ -73,8 +73,8 @@ repeat:
* orig_start..fdt->next_fd
*/
start = orig_start;
if (start < fdt->next_fd)
start = fdt->next_fd;
if (start < files->next_fd)
start = files->next_fd;
newfd = start;
if (start < fdt->max_fdset) {
@ -102,9 +102,8 @@ repeat:
* we reacquire the fdtable pointer and use it while holding
* the lock, no one can free it during that time.
*/
fdt = files_fdtable(files);
if (start <= fdt->next_fd)
fdt->next_fd = newfd + 1;
if (start <= files->next_fd)
files->next_fd = newfd + 1;
error = newfd;

34
fs/file.c
View File

@ -125,7 +125,8 @@ static void free_fdtable_rcu(struct rcu_head *rcu)
kmem_cache_free(files_cachep, fdt->free_files);
return;
}
if (fdt->max_fdset <= __FD_SETSIZE && fdt->max_fds <= NR_OPEN_DEFAULT) {
if (fdt->max_fdset <= EMBEDDED_FD_SET_SIZE &&
fdt->max_fds <= NR_OPEN_DEFAULT) {
/*
* The fdtable was embedded
*/
@ -155,8 +156,9 @@ static void free_fdtable_rcu(struct rcu_head *rcu)
void free_fdtable(struct fdtable *fdt)
{
if (fdt->free_files || fdt->max_fdset > __FD_SETSIZE ||
fdt->max_fds > NR_OPEN_DEFAULT)
if (fdt->free_files ||
fdt->max_fdset > EMBEDDED_FD_SET_SIZE ||
fdt->max_fds > NR_OPEN_DEFAULT)
call_rcu(&fdt->rcu, free_fdtable_rcu);
}
@ -199,7 +201,6 @@ static void copy_fdtable(struct fdtable *nfdt, struct fdtable *fdt)
(nfdt->max_fds - fdt->max_fds) *
sizeof(struct file *));
}
nfdt->next_fd = fdt->next_fd;
}
/*
@ -220,11 +221,9 @@ fd_set * alloc_fdset(int num)
void free_fdset(fd_set *array, int num)
{
int size = num / 8;
if (num <= __FD_SETSIZE) /* Don't free an embedded fdset */
if (num <= EMBEDDED_FD_SET_SIZE) /* Don't free an embedded fdset */
return;
else if (size <= PAGE_SIZE)
else if (num <= 8 * PAGE_SIZE)
kfree(array);
else
vfree(array);
@ -237,22 +236,17 @@ static struct fdtable *alloc_fdtable(int nr)
fd_set *new_openset = NULL, *new_execset = NULL;
struct file **new_fds;
fdt = kmalloc(sizeof(*fdt), GFP_KERNEL);
fdt = kzalloc(sizeof(*fdt), GFP_KERNEL);
if (!fdt)
goto out;
memset(fdt, 0, sizeof(*fdt));
nfds = __FD_SETSIZE;
nfds = 8 * L1_CACHE_BYTES;
/* Expand to the max in easy steps */
do {
if (nfds < (PAGE_SIZE * 8))
nfds = PAGE_SIZE * 8;
else {
nfds = nfds * 2;
if (nfds > NR_OPEN)
nfds = NR_OPEN;
}
} while (nfds <= nr);
while (nfds <= nr) {
nfds = nfds * 2;
if (nfds > NR_OPEN)
nfds = NR_OPEN;
}
new_openset = alloc_fdset(nfds);
new_execset = alloc_fdset(nfds);

8
fs/open.c
View File

@ -973,7 +973,7 @@ repeat:
fdt = files_fdtable(files);
fd = find_next_zero_bit(fdt->open_fds->fds_bits,
fdt->max_fdset,
fdt->next_fd);
files->next_fd);
/*
* N.B. For clone tasks sharing a files structure, this test
@ -998,7 +998,7 @@ repeat:
FD_SET(fd, fdt->open_fds);
FD_CLR(fd, fdt->close_on_exec);
fdt->next_fd = fd + 1;
files->next_fd = fd + 1;
#if 1
/* Sanity check */
if (fdt->fd[fd] != NULL) {
@ -1019,8 +1019,8 @@ static void __put_unused_fd(struct files_struct *files, unsigned int fd)
{
struct fdtable *fdt = files_fdtable(files);
__FD_CLR(fd, fdt->open_fds);
if (fd < fdt->next_fd)
fdt->next_fd = fd;
if (fd < files->next_fd)
files->next_fd = fd;
}
void fastcall put_unused_fd(unsigned int fd)

28
include/linux/file.h
View File

@ -10,6 +10,7 @@
#include <linux/compiler.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/types.h>
/*
* The default fd array needs to be at least BITS_PER_LONG,
@ -17,10 +18,22 @@
*/
#define NR_OPEN_DEFAULT BITS_PER_LONG
/*
* The embedded_fd_set is a small fd_set,
* suitable for most tasks (which open <= BITS_PER_LONG files)
*/
struct embedded_fd_set {
unsigned long fds_bits[1];
};
/*
* More than this number of fds: we use a separately allocated fd_set
*/
#define EMBEDDED_FD_SET_SIZE (BITS_PER_BYTE * sizeof(struct embedded_fd_set))
struct fdtable {
unsigned int max_fds;
int max_fdset;
int next_fd;
struct file ** fd; /* current fd array */
fd_set *close_on_exec;
fd_set *open_fds;
@ -33,13 +46,20 @@ struct fdtable {
* Open file table structure
*/
struct files_struct {
/*
* read mostly part
*/
atomic_t count;
struct fdtable *fdt;
struct fdtable fdtab;
fd_set close_on_exec_init;
fd_set open_fds_init;
/*
* written part on a separate cache line in SMP
*/
spinlock_t file_lock ____cacheline_aligned_in_smp;
int next_fd;
struct embedded_fd_set close_on_exec_init;
struct embedded_fd_set open_fds_init;
struct file * fd_array[NR_OPEN_DEFAULT];
spinlock_t file_lock; /* Protects concurrent writers. Nests inside tsk->alloc_lock */
};
#define files_fdtable(files) (rcu_dereference((files)->fdt))

10
include/linux/init_task.h
View File

@ -7,11 +7,10 @@
#define INIT_FDTABLE \
{ \
.max_fds = NR_OPEN_DEFAULT, \
.max_fdset = __FD_SETSIZE, \
.next_fd = 0, \
.max_fdset = EMBEDDED_FD_SET_SIZE, \
.fd = &init_files.fd_array[0], \
.close_on_exec = &init_files.close_on_exec_init, \
.open_fds = &init_files.open_fds_init, \
.close_on_exec = (fd_set *)&init_files.close_on_exec_init, \
.open_fds = (fd_set *)&init_files.open_fds_init, \
.rcu = RCU_HEAD_INIT, \
.free_files = NULL, \
.next = NULL, \
@ -20,9 +19,10 @@
#define INIT_FILES \
{ \
.count = ATOMIC_INIT(1), \
.file_lock = SPIN_LOCK_UNLOCKED, \
.fdt = &init_files.fdtab, \
.fdtab = INIT_FDTABLE, \
.file_lock = SPIN_LOCK_UNLOCKED, \
.next_fd = 0, \
.close_on_exec_init = { { 0, } }, \
.open_fds_init = { { 0, } }, \
.fd_array = { NULL, } \

8
kernel/fork.c
View File

@ -607,12 +607,12 @@ static struct files_struct *alloc_files(void)
atomic_set(&newf->count, 1);
spin_lock_init(&newf->file_lock);
newf->next_fd = 0;
fdt = &newf->fdtab;
fdt->next_fd = 0;
fdt->max_fds = NR_OPEN_DEFAULT;
fdt->max_fdset = __FD_SETSIZE;
fdt->close_on_exec = &newf->close_on_exec_init;
fdt->open_fds = &newf->open_fds_init;
fdt->max_fdset = EMBEDDED_FD_SET_SIZE;
fdt->close_on_exec = (fd_set *)&newf->close_on_exec_init;
fdt->open_fds = (fd_set *)&newf->open_fds_init;
fdt->fd = &newf->fd_array[0];
INIT_RCU_HEAD(&fdt->rcu);
fdt->free_files = NULL;