Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755727Ab2K1Rwj (ORCPT ); Wed, 28 Nov 2012 12:52:39 -0500 Received: from mail-qc0-f174.google.com ([209.85.216.174]:57921 "EHLO mail-qc0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754416Ab2K1Rwf (ORCPT ); Wed, 28 Nov 2012 12:52:35 -0500 From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Ingo Molnar , Peter Zijlstra , Thomas Gleixner , Steven Rostedt , Paul Gortmaker Subject: [PATCH 3/4] cputime: Consolidate cputime adjustment code Date: Wed, 28 Nov 2012 18:52:19 +0100 Message-Id: <1354125140-9294-4-git-send-email-fweisbec@gmail.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1354125140-9294-1-git-send-email-fweisbec@gmail.com> References: <1354125140-9294-1-git-send-email-fweisbec@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5998 Lines: 180 task_cputime_adjusted() and thread_group_cputime_adjusted() essentially share the same code. They just don't use the same source: * The first function uses the cputime in the task struct and the previous adjusted snapshot that ensures monotonicity. * The second adds the cputime of all tasks in the group and the previous adjusted snapshot of the whole group from the signal structure. Just consolidate the common code that does the adjustment. These functions just need to fetch the values from the appropriate source. Signed-off-by: Frederic Weisbecker Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Steven Rostedt Cc: Paul Gortmaker --- include/linux/sched.h | 23 +++++++++++++++++++---- kernel/fork.c | 2 +- kernel/sched/cputime.c | 46 +++++++++++++++++++++++----------------------- 3 files changed, 43 insertions(+), 28 deletions(-) diff --git a/include/linux/sched.h b/include/linux/sched.h index e75cab5..5dafac36 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -434,13 +434,28 @@ struct cpu_itimer { }; /** + * struct cputime - snaphsot of system and user cputime + * @utime: time spent in user mode + * @stime: time spent in system mode + * + * Gathers a generic snapshot of user and system time. + */ +struct cputime { + cputime_t utime; + cputime_t stime; +}; + +/** * struct task_cputime - collected CPU time counts * @utime: time spent in user mode, in &cputime_t units * @stime: time spent in kernel mode, in &cputime_t units * @sum_exec_runtime: total time spent on the CPU, in nanoseconds * - * This structure groups together three kinds of CPU time that are - * tracked for threads and thread groups. Most things considering + * This is an extension of struct cputime that includes the total runtime + * spent by the task from the scheduler point of view. + * + * As a result, this structure groups together three kinds of CPU time + * that are tracked for threads and thread groups. Most things considering * CPU time want to group these counts together and treat all three * of them in parallel. */ @@ -581,7 +596,7 @@ struct signal_struct { cputime_t gtime; cputime_t cgtime; #ifndef CONFIG_VIRT_CPU_ACCOUNTING - cputime_t prev_utime, prev_stime; + struct cputime prev_cputime; #endif unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; @@ -1340,7 +1355,7 @@ struct task_struct { cputime_t utime, stime, utimescaled, stimescaled; cputime_t gtime; #ifndef CONFIG_VIRT_CPU_ACCOUNTING - cputime_t prev_utime, prev_stime; + struct cputime prev_cputime; #endif unsigned long nvcsw, nivcsw; /* context switch counts */ struct timespec start_time; /* monotonic time */ diff --git a/kernel/fork.c b/kernel/fork.c index 8b20ab7..0e7cdb9 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1222,7 +1222,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, p->utime = p->stime = p->gtime = 0; p->utimescaled = p->stimescaled = 0; #ifndef CONFIG_VIRT_CPU_ACCOUNTING - p->prev_utime = p->prev_stime = 0; + p->prev_cputime.utime = p->prev_cputime.stime = 0; #endif #if defined(SPLIT_RSS_COUNTING) memset(&p->rss_stat, 0, sizeof(p->rss_stat)); diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c index 7dc1553..220fdc4 100644 --- a/kernel/sched/cputime.c +++ b/kernel/sched/cputime.c @@ -516,14 +516,18 @@ static cputime_t scale_utime(cputime_t utime, cputime_t rtime, cputime_t total) return (__force cputime_t) temp; } -void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st) +static void cputime_adjust(struct task_cputime *curr, + struct cputime *prev, + cputime_t *ut, cputime_t *st) { - cputime_t rtime, utime = p->utime, total = utime + p->stime; + cputime_t rtime, utime, total; + utime = curr->utime; + total = utime + curr->stime; /* * Use CFS's precise accounting: */ - rtime = nsecs_to_cputime(p->se.sum_exec_runtime); + rtime = nsecs_to_cputime(curr->sum_exec_runtime); if (total) utime = scale_utime(utime, rtime, total); @@ -533,11 +537,22 @@ void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st) /* * Compare with previous values, to keep monotonicity: */ - p->prev_utime = max(p->prev_utime, utime); - p->prev_stime = max(p->prev_stime, rtime - p->prev_utime); + prev->utime = max(prev->utime, utime); + prev->stime = max(prev->stime, rtime - prev->utime); + + *ut = prev->utime; + *st = prev->stime; +} - *ut = p->prev_utime; - *st = p->prev_stime; +void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st) +{ + struct task_cputime cputime = { + .utime = p->utime, + .stime = p->stime, + .sum_exec_runtime = p->se.sum_exec_runtime, + }; + + cputime_adjust(&cputime, &p->prev_cputime, ut, st); } /* @@ -545,24 +560,9 @@ void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st) */ void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st) { - struct signal_struct *sig = p->signal; struct task_cputime cputime; - cputime_t rtime, utime, total; thread_group_cputime(p, &cputime); - - total = cputime.utime + cputime.stime; - rtime = nsecs_to_cputime(cputime.sum_exec_runtime); - - if (total) - utime = scale_utime(cputime.utime, rtime, total); - else - utime = rtime; - - sig->prev_utime = max(sig->prev_utime, utime); - sig->prev_stime = max(sig->prev_stime, rtime - sig->prev_utime); - - *ut = sig->prev_utime; - *st = sig->prev_stime; + cputime_adjust(&cputime, &p->signal->prev_cputime, ut, st); } #endif -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/