From a324956fae05d863386c682830e917f6685f1d4f Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 21 Aug 2019 21:08:53 +0200 Subject: [PATCH] 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 Reviewed-by: Frederic Weisbecker Link: https://lkml.kernel.org/r/20190821192919.780348088@linutronix.de --- kernel/time/posix-cpu-timers.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c index c22b6b604a95..cb736787145b 100644 --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -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;