linux-kernel - [patch V2 05/38] itimers: Use quick sample function

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Message-Id: <20190821192919.689713638@linutronix.de>
Date:   Wed, 21 Aug 2019 21:08:52 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        John Stultz <john.stultz@...aro.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        Christoph Hellwig <hch@....de>
Subject: [patch V2 05/38] itimers: Use quick sample function

get_itimer() locks sighand lock and checks whether the timer is already
expired. If it is not expired then the thread group cputime accounting is
already enabled. Use the sampling function not the one which is meant for
starting a timer.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/itimer.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/time/itimer.c
+++ b/kernel/time/itimer.c
@@ -58,7 +58,7 @@ static void get_cpu_itimer(struct task_s
 		struct task_cputime cputime;
 		u64 t;
 
-		thread_group_cputimer(tsk, &cputime);
+		thread_group_sample_cputime(tsk, &cputime);
 		if (clock_id == CPUCLOCK_PROF)
 			t = cputime.utime + cputime.stime;
 		else