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s390: move cputime accounting fields from thread_info to thread_struct

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The user_timer and system_timer fields are used for the per-thread
cputime accounting code. The access to these values is simpler if
they are moved to the thread_struct as the task_thread_info(tsk)
indirection is not needed anymore.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2016-11-08 12:15:59 +01:00
parent f8fc82b471
commit 90c53e6580
6 changed files with 16 additions and 27 deletions
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2
arch/s390/include/asm/processor.h
View File

@ -110,6 +110,8 @@ typedef struct {
struct thread_struct {
unsigned int acrs[NUM_ACRS];
unsigned long ksp; /* kernel stack pointer */
unsigned long user_timer; /* task cputime in user space */
unsigned long system_timer; /* task cputime in kernel space */
mm_segment_t mm_segment;
unsigned long gmap_addr; /* address of last gmap fault. */
unsigned int gmap_write_flag; /* gmap fault write indication */

2
arch/s390/include/asm/thread_info.h
View File

@ -32,8 +32,6 @@
struct thread_info {
unsigned long flags; /* low level flags */
unsigned long sys_call_table; /* System call table address */
__u64 user_timer;
__u64 system_timer;
unsigned long last_break; /* last breaking-event-address. */
};

2
arch/s390/kernel/asm-offsets.c
View File

@ -41,8 +41,6 @@ int main(void)
/* thread info offsets */
OFFSET(__TI_flags, task_struct, thread_info.flags);
OFFSET(__TI_sysc_table, task_struct, thread_info.sys_call_table);
OFFSET(__TI_user_timer, task_struct, thread_info.user_timer);
OFFSET(__TI_system_timer, task_struct, thread_info.system_timer);
OFFSET(__TI_last_break, task_struct, thread_info.last_break);
BLANK();
/* pt_regs offsets */

6
arch/s390/kernel/process.c
View File

@ -103,7 +103,6 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
unsigned long arg, struct task_struct *p)
{
struct thread_info *ti;
struct fake_frame
{
struct stack_frame sf;
@ -121,9 +120,8 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
memset(&p->thread.per_event, 0, sizeof(p->thread.per_event));
clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
/* Initialize per thread user and system timer values */
ti = task_thread_info(p);
ti->user_timer = 0;
ti->system_timer = 0;
p->thread.user_timer = 0;
p->thread.system_timer = 0;
frame->sf.back_chain = 0;
/* new return point is ret_from_fork */

5
arch/s390/kernel/smp.c
View File

@ -259,15 +259,14 @@ static void pcpu_prepare_secondary(struct pcpu *pcpu, int cpu)
static void pcpu_attach_task(struct pcpu *pcpu, struct task_struct *tsk)
{
struct lowcore *lc = pcpu->lowcore;
struct thread_info *ti = task_thread_info(tsk);
lc->kernel_stack = (unsigned long) task_stack_page(tsk)
+ THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
lc->current_task = (unsigned long) tsk;
lc->lpp = LPP_MAGIC;
lc->current_pid = tsk->pid;
lc->user_timer = ti->user_timer;
lc->system_timer = ti->system_timer;
lc->user_timer = tsk->thread.user_timer;
lc->system_timer = tsk->thread.system_timer;
lc->steal_timer = 0;
}

26
arch/s390/kernel/vtime.c
View File

@ -96,7 +96,6 @@ static void update_mt_scaling(void)
*/
static int do_account_vtime(struct task_struct *tsk, int hardirq_offset)
{
struct thread_info *ti = task_thread_info(tsk);
u64 timer, clock, user, system, steal;
u64 user_scaled, system_scaled;
@ -119,13 +118,13 @@ static int do_account_vtime(struct task_struct *tsk, int hardirq_offset)
time_after64(jiffies_64, this_cpu_read(mt_scaling_jiffies)))
update_mt_scaling();
user = S390_lowcore.user_timer - ti->user_timer;
user = S390_lowcore.user_timer - tsk->thread.user_timer;
S390_lowcore.steal_timer -= user;
ti->user_timer = S390_lowcore.user_timer;
tsk->thread.user_timer = S390_lowcore.user_timer;
system = S390_lowcore.system_timer - ti->system_timer;
system = S390_lowcore.system_timer - tsk->thread.system_timer;
S390_lowcore.steal_timer -= system;
ti->system_timer = S390_lowcore.system_timer;
tsk->thread.system_timer = S390_lowcore.system_timer;
user_scaled = user;
system_scaled = system;
@ -151,15 +150,11 @@ static int do_account_vtime(struct task_struct *tsk, int hardirq_offset)
void vtime_task_switch(struct task_struct *prev)
{
struct thread_info *ti;
do_account_vtime(prev, 0);
ti = task_thread_info(prev);
ti->user_timer = S390_lowcore.user_timer;
ti->system_timer = S390_lowcore.system_timer;
ti = task_thread_info(current);
S390_lowcore.user_timer = ti->user_timer;
S390_lowcore.system_timer = ti->system_timer;
prev->thread.user_timer = S390_lowcore.user_timer;
prev->thread.system_timer = S390_lowcore.system_timer;
S390_lowcore.user_timer = current->thread.user_timer;
S390_lowcore.system_timer = current->thread.system_timer;
}
/*
@ -179,7 +174,6 @@ void vtime_account_user(struct task_struct *tsk)
*/
void vtime_account_irq_enter(struct task_struct *tsk)
{
struct thread_info *ti = task_thread_info(tsk);
u64 timer, system, system_scaled;
timer = S390_lowcore.last_update_timer;
@ -191,9 +185,9 @@ void vtime_account_irq_enter(struct task_struct *tsk)
time_after64(jiffies_64, this_cpu_read(mt_scaling_jiffies)))
update_mt_scaling();
system = S390_lowcore.system_timer - ti->system_timer;
system = S390_lowcore.system_timer - tsk->thread.system_timer;
S390_lowcore.steal_timer -= system;
ti->system_timer = S390_lowcore.system_timer;
tsk->thread.system_timer = S390_lowcore.system_timer;
system_scaled = system;
/* Do MT utilization scaling */
if (smp_cpu_mtid) {