From: Mel Gorman <mgorman@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@suse.cz>, Mel Gorman <mgorman@suse.de>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>
Subject: [PATCH 0/2] Avoid unnecessary overhead in fault paths due to memcg and rss stats
Date: Wed, 23 Jul 2014 12:24:14 +0100 [thread overview]
Message-ID: <1406114656-16350-1-git-send-email-mgorman@suse.de> (raw)
While looking for something else entirely I spotted two small issues in the
page fault fast path. Enabling memcg takes the RCU read lock unnecessarily
even when the task is not part of a memcg and we fiddle with RSS stats
more than necessary. Details in the patches.
include/linux/memcontrol.h | 8 ++++++++
include/linux/mm_types.h | 1 -
mm/memory.c | 32 +++++++++++++-------------------
3 files changed, 21 insertions(+), 20 deletions(-)
--
1.8.4.5
next reply other threads:[~2014-07-23 11:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-23 11:24 Mel Gorman [this message]
2014-07-23 11:24 ` [PATCH 1/2] mm: Avoid full RCU lookup of memcg for statistics updates Mel Gorman
2014-07-23 11:44 ` Johannes Weiner
2014-07-23 12:58 ` Mel Gorman
2014-07-23 11:24 ` [PATCH 2/2] mm: Move RSS stat event count synchronisation out of the fast path Mel Gorman
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