Re: [PATCH 0/3] Reduce amount of time kswapd sleeps prematurely

On Wed, 15 Feb 2017 21:29:06 +0000 Mel Gorman [off-list ref] wrote:

On Wed, Feb 15, 2017 at 12:30:55PM -0800, Andrew Morton wrote:

quoted

On Wed, 15 Feb 2017 09:22:44 +0000 Mel Gorman [off-list ref] wrote:

quoted

This patchset is based on mmots as of Feb 9th, 2016. The baseline is
important as there are a number of kswapd-related fixes in that tree and
a comparison against v4.10-rc7 would be almost meaningless as a result.

It's very late to squeeze this into 4.10.  We can make it 4.11 material
and perhaps tag it for backporting into 4.10.1?

It would be important that Johannes's patches go along with then because
I'm relied on Johannes' fixes to deal with pages being inappropriately
written back from reclaim context when I was analysing the workload.
I'm thinking specifically about these patches

mm-vmscan-scan-dirty-pages-even-in-laptop-mode.patch
mm-vmscan-kick-flushers-when-we-encounter-dirty-pages-on-the-lru.patch
mm-vmscan-kick-flushers-when-we-encounter-dirty-pages-on-the-lru-fix.patch
mm-vmscan-remove-old-flusher-wakeup-from-direct-reclaim-path.patch
mm-vmscan-only-write-dirty-pages-that-the-scanner-has-seen-twice.patch
mm-vmscan-move-dirty-pages-out-of-the-way-until-theyre-flushed.patch
mm-vmscan-move-dirty-pages-out-of-the-way-until-theyre-flushed-fix.patch

This is 4.11 material for sure but I would not automatically try merging
them to 4.10 unless those patches were also included, ideally with a rerun
of just those patches against 4.10 to make sure there are no surprises
lurking in there.

Head spinning a bit.  You're saying that if the three patches in the
series "Reduce amount of time kswapd sleeps prematurely" are held off
until 4.11 then the above 6 patches from Johannes should also be held
off for 4.11?

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>