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Message-ID: <20211201010348.31e99637@mail.inbox.lv>
Date: Wed, 1 Dec 2021 01:03:48 +0900
From: Alexey Avramov <hakavlad@...ox.lv>
To: Mel Gorman <mgorman@...hsingularity.net>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Michal Hocko <mhocko@...e.com>,
Vlastimil Babka <vbabka@...e.cz>,
Rik van Riel <riel@...riel.com>,
Mike Galbraith <efault@....de>,
Darrick Wong <djwong@...nel.org>, regressions@...ts.linux.dev,
Linux-fsdevel <linux-fsdevel@...r.kernel.org>,
Linux-MM <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] mm: vmscan: Reduce throttling due to a failure to
make progress
I tested this [1] patch on top of 5.16-rc2. It's the same test with 10 tails.
- with noswap
Summary:
2021-11-30 23:32:36,890: Stall times for the last 548.6s:
2021-11-30 23:32:36,890: -----------
2021-11-30 23:32:36,891: some cpu 3.7s, avg 0.7%
2021-11-30 23:32:36,891: -----------
2021-11-30 23:32:36,891: some io 187.6s, avg 34.2%
2021-11-30 23:32:36,891: full io 178.3s, avg 32.5%
2021-11-30 23:32:36,891: -----------
2021-11-30 23:32:36,892: some memory 392.2s, avg 71.5%
2021-11-30 23:32:36,892: full memory 390.7s, avg 71.2%
full psi:
https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/noswap/psi
mem:
https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/noswap/mem
- with swappiness=0
Summary:
2021-11-30 23:51:48,969: Stall times for the last 919.4s:
2021-11-30 23:51:48,969: -----------
2021-11-30 23:51:48,969: some cpu 5.5s, avg 0.6%
2021-11-30 23:51:48,970: -----------
2021-11-30 23:51:48,970: some io 240.4s, avg 26.2%
2021-11-30 23:51:48,970: full io 230.6s, avg 25.1%
2021-11-30 23:51:48,970: -----------
2021-11-30 23:51:48,970: some memory 806.1s, avg 87.7%
2021-11-30 23:51:48,971: full memory 800.5s, avg 87.1%
psi log:
https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/swappiness0/psi
mem log:
https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/swappiness0/mem
In some cases stalls was very short, but in many cases stalls was long.
The result is still not good enough.
offtop
======
The same test with the patch [1] on top of 5.16-rc2 + le9 patch [2]
with vm.clean_min_kbytes=99000.
- with noswap
Summary:
2021-11-30 23:59:32,209: Stall times for the last 73.1s:
2021-11-30 23:59:32,209: -----------
2021-11-30 23:59:32,209: some cpu 0.4s, avg 0.5%
2021-11-30 23:59:32,209: -----------
2021-11-30 23:59:32,210: some io 5.8s, avg 8.0%
2021-11-30 23:59:32,210: full io 5.3s, avg 7.3%
2021-11-30 23:59:32,210: -----------
2021-11-30 23:59:32,210: some memory 3.3s, avg 4.5%
2021-11-30 23:59:32,210: full memory 3.1s, avg 4.2%
This is just an example of what a result close to the expected
result might be (especially note io pressure values).
full psi:
https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/noswap_le9_min99k/psi
mem:
https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/noswap_le9_min99k/mem
[1] https://lore.kernel.org/lkml/20211129150117.GO3366@techsingularity.net/
[2] https://lore.kernel.org/all/20211130201652.2218636d@mail.inbox.lv/
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