| From: |
| Mel Gorman <mgorman-AT-techsingularity.net> |
| To: |
| LKML <linux-kernel-AT-vger.kernel.org>, Linux-MM <linux-mm-AT-kvack.org>, Mel Gorman <mgorman-AT-techsingularity.net> |
| 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 |
| Message-ID: |
| <1473415175-20807-1-git-send-email-mgorman@techsingularity.net> |
| Cc: |
| Dave Chinner <david-AT-fromorbit.com>, Linus Torvalds <torvalds-AT-linux-foundation.org>, Ying Huang <ying.huang-AT-intel.com>, Michal Hocko <mhocko-AT-kernel.org> |
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
