linux-kernel - [PATCH 0/1] sched/cputime: Mitigate performance regression in times()/clock

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Message-Id: <1470385316-15027-1-git-send-email-ggherdovich@suse.cz>
Date:	Fri,  5 Aug 2016 10:21:55 +0200
From:	Giovanni Gherdovich <ggherdovich@...e.cz>
To:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Galbraith <mgalbraith@...e.de>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	linux-kernel@...r.kernel.org,
	Mel Gorman <mgorman@...hsingularity.net>,
	Giovanni Gherdovich <ggherdovich@...e.cz>
Subject: [PATCH 0/1] sched/cputime: Mitigate performance regression in times()/clock_gettime()

As per Peter Zijlstra's review, these are the difference wrt V1:

* inclusion of appropriate header file linux/prefetch.h
* factorized the calls to prefetch into a separate function
* introduction of the local variable curr as a form of compiler
  subexpression elimination (CSE)
* fixed Signed-off-by chain
* added comment as per why the prefetches are needed

Giovanni Gherdovich (1):
  sched/cputime: Mitigate performance regression in
    times()/clock_gettime()

 kernel/sched/core.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

-- 
2.6.6