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posix-cpu-timers: Sample directly in timer check 

The thread group accounting is active, otherwise the expiry function would
not be running. Sample the thread group time directly.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lkml.kernel.org/r/20190821192919.780348088@linutronix.de
This commit is contained in:
Thomas Gleixner 2019-08-21 21:08:53 +02:00
parent a34360d424
commit a324956fae
1 changed files with 4 additions and 3 deletions
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7
kernel/time/posix-cpu-timers.c
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@ -914,16 +914,17 @@ static void check_process_timers(struct task_struct *tsk,
if (!READ_ONCE(tsk->signal->cputimer.running))
return;
/*
/*
* Signify that a thread is checking for process timers.
* Write access to this field is protected by the sighand lock.
*/
sig->cputimer.checking_timer = true;
/*
* Collect the current process totals.
* Collect the current process totals. Group accounting is active
* so the sample can be taken directly.
*/
thread_group_cputimer(tsk, &cputime);
sample_cputime_atomic(&cputime, &sig->cputimer.cputime_atomic);
utime = cputime.utime;
ptime = utime + cputime.stime;
sum_sched_runtime = cputime.sum_exec_runtime;