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posix-cpu-timers: Switch check_*_timers() to array cache 

Use the array based expiry cache in check_thread_timers() and convert the
store in check_process_timers() for consistency.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lkml.kernel.org/r/20190821192921.408222378@linutronix.de
This commit is contained in:
Thomas Gleixner 2019-08-21 21:09:10 +02:00
parent 1b0dd96d0f
commit c02b078e63
1 changed files with 11 additions and 15 deletions
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26
kernel/time/posix-cpu-timers.c
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@ -778,8 +778,7 @@ static void check_thread_timers(struct task_struct *tsk,
struct list_head *firing)
{
struct list_head *timers = tsk->posix_cputimers.cpu_timers;
struct task_cputime *tsk_expires = &tsk->posix_cputimers.cputime_expires;
u64 expires, stime, utime;
u64 stime, utime, *expires = tsk->posix_cputimers.expiries;
unsigned long soft;
if (dl_task(tsk))
@ -789,19 +788,14 @@ static void check_thread_timers(struct task_struct *tsk,
* If cputime_expires is zero, then there are no active
* per thread CPU timers.
*/
if (task_cputime_zero(tsk_expires))
if (task_cputime_zero(&tsk->posix_cputimers.cputime_expires))
return;
task_cputime(tsk, &utime, &stime);
expires = check_timers_list(timers, firing, utime + stime);
tsk_expires->prof_exp = expires;
expires = check_timers_list(++timers, firing, utime);
tsk_expires->virt_exp = expires;
tsk_expires->sched_exp = check_timers_list(++timers, firing,
tsk->se.sum_exec_runtime);
*expires++ = check_timers_list(timers, firing, utime + stime);
*expires++ = check_timers_list(++timers, firing, utime);
*expires = check_timers_list(++timers, firing, tsk->se.sum_exec_runtime);
/*
* Check for the special case thread timers.
@ -839,7 +833,8 @@ static void check_thread_timers(struct task_struct *tsk,
__group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk);
}
}
if (task_cputime_zero(tsk_expires))
if (task_cputime_zero(&tsk->posix_cputimers.cputime_expires))
tick_dep_clear_task(tsk, TICK_DEP_BIT_POSIX_TIMER);
}
@ -958,9 +953,10 @@ static void check_process_timers(struct task_struct *tsk,
prof_expires = x;
}
sig->posix_cputimers.cputime_expires.prof_exp = prof_expires;
sig->posix_cputimers.cputime_expires.virt_exp = virt_expires;
sig->posix_cputimers.cputime_expires.sched_exp = sched_expires;
sig->posix_cputimers.expiries[CPUCLOCK_PROF] = prof_expires;
sig->posix_cputimers.expiries[CPUCLOCK_VIRT] = virt_expires;
sig->posix_cputimers.expiries[CPUCLOCK_SCHED] = sched_expires;
if (task_cputime_zero(&sig->posix_cputimers.cputime_expires))
stop_process_timers(sig);