linux-kernel - [PATCH 0/1] selftests/vm: 8x compaction

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Message-ID: <20201002080621.551044-1-jhubbard@nvidia.com>
Date:   Fri, 2 Oct 2020 01:06:20 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     Shuah Khan <shuah@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-kselftest@...r.kernel.org>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH 0/1] selftests/vm: 8x compaction_test speedup

Hi,

Maybe this should really be an RFC, given that I don't fully understand
why the compaction_test.c program was mmap'ing 1 MB at a time. So
apologies in advance if I've mucked up something important, but if so,
maybe we can still find a way to get this fixed up to something better.

Anyway: there are 20+ tests in tools/testing/selftests/vm/. The entire
running time for these (via run_vmtest.sh) is about 56 seconds, of which
over half is due to just one test: compaction_test, which takes 27 sec!
(A runner-up is HMM, at 11 sec, so it's up for a look next.) The other
tests mostly take a few ms, and a few take 1.0 sec.

This drops the compaction_test run time from 27, to 3.3 sec. Enjoy. :)

thanks,
John Hubbard
NVIDIA

John Hubbard (1):
  selftests/vm: 8x compaction_test speedup

 tools/testing/selftests/vm/compaction_test.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

-- 
2.28.0