From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B263FC3A59E for ; Wed, 21 Aug 2019 19:33:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8E83B2064A for ; Wed, 21 Aug 2019 19:33:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729915AbfHUTas (ORCPT ); Wed, 21 Aug 2019 15:30:48 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:57153 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729841AbfHUTar (ORCPT ); Wed, 21 Aug 2019 15:30:47 -0400 Received: from localhost ([127.0.0.1] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1i0WJg-00049t-V8; Wed, 21 Aug 2019 21:30:45 +0200 Message-Id: <20190821192919.780348088@linutronix.de> User-Agent: quilt/0.65 Date: Wed, 21 Aug 2019 21:08:53 +0200 From: Thomas Gleixner To: LKML Cc: Oleg Nesterov , Ingo Molnar , Peter Zijlstra , John Stultz , Frederic Weisbecker , Anna-Maria Behnsen , Christoph Hellwig Subject: [patch V2 06/38] posix-cpu-timers: Sample directly in timer check References: <20190821190847.665673890@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- kernel/time/posix-cpu-timers.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -914,16 +914,17 @@ static void check_process_timers(struct 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;