From: Mel Gorman <mgorman@techsingularity.net>
To: LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>,
Mel Gorman <mgorman@techsingularity.net>
Cc: Dave Chinner <david@fromorbit.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ying Huang <ying.huang@intel.com>,
Michal Hocko <mhocko@kernel.org>
Subject: [RFC PATCH 0/4] Reduce tree_lock contention during swap and reclaim of a single file v1
Date: Fri, 9 Sep 2016 10:59:31 +0100 [thread overview]
Message-ID: <1473415175-20807-1-git-send-email-mgorman@techsingularity.net> (raw)
This is a follow-on series from the thread "[lkp] [xfs] 68a9f5e700:
aim7.jobs-per-min -13.6% regression" with active parties cc'd. I've
pushed the series to git.kernel.org where the LKP robot should pick it
up automatically.
git://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git mm-reclaim-contention-v1r15
The progression of this series has been unsatisfactory. Dave originally
reported a problem with tree_lock contention and while it can be fixed
by pushing reclaim to direct reclaim, it slows swap considerably and was
not a universal win. This series is the best balance I've found so far
between the swapping and large rewriter cases.
I never reliably produced the same contentions that Dave did so testing
is needed. Dave, ideally you would test patches 1+2 and patches 1+4 but
a test of patches 1+3 would also be nice if you have the time. Minimally,
I'm expected that patches 1+2 will help the swapping-to-fast-storage case
(LKP to confirm independently) and may be worth considering on their own
even if Dave's test case is not helped.
drivers/block/brd.c | 1 +
mm/vmscan.c | 209 +++++++++++++++++++++++++++++++++++++++++++++-------
2 files changed, 182 insertions(+), 28 deletions(-)
--
2.6.4
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next reply other threads:[~2016-09-09 9:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-09 9:59 Mel Gorman [this message]
2016-09-09 9:59 ` [PATCH 1/4] mm, vmscan: Batch removal of mappings under a single lock during reclaim Mel Gorman
2016-09-16 13:25 ` Peter Zijlstra
2016-09-16 14:07 ` Peter Zijlstra
2016-09-16 18:33 ` Linus Torvalds
2016-09-17 1:36 ` Peter Zijlstra
2016-09-09 9:59 ` [PATCH 2/4] block, brd: Treat storage as non-rotational Mel Gorman
2016-09-09 9:59 ` [PATCH 3/4] mm, vmscan: Stall kswapd if contending on tree_lock Mel Gorman
2016-09-09 9:59 ` [PATCH 4/4] mm, vmscan: Potentially stall direct reclaimers on tree_lock contention Mel Gorman
2016-09-09 15:31 ` [RFC PATCH 0/4] Reduce tree_lock contention during swap and reclaim of a single file v1 Linus Torvalds
2016-09-09 16:19 ` Mel Gorman
2016-09-09 18:16 ` Huang, Ying
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