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

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Message-ID: <050F889A-AE47-47E4-8334-0D6FC7170721@akamai.com>
Date:   Fri, 2 Oct 2020 23:25:25 +0000
From:   "Jayaramappa, Srilakshmi" <sjayaram@...mai.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        John Hubbard <jhubbard@...dia.com>
CC:     Shuah Khan <shuah@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH 1/1] selftests/vm: 8x compaction_test speedup


On 10/2/20, 6:05 PM, "Andrew Morton" <akpm@...ux-foundation.org> wrote:

    On Fri, 2 Oct 2020 01:06:21 -0700 John Hubbard <jhubbard@...dia.com> wrote:

    > This patch reduces the running time for compaction_test from about 27
    > sec, to 3.3 sec, which is about an 8x speedup.
    > 
    > These numbers are for an Intel x86_64 system with 32 GB of DRAM.
    > 
    > The compaction_test.c program was spending most of its time doing
    > mmap(), 1 MB at a time, on about 25 GB of memory.
    > 
    > Instead, do the mmaps 100 MB at a time. (Going past 100 MB doesn't make
    > things go much faster, because other parts of the program are using the
    > remaining time.)

    Seems nice.  It's been 5 years, but hopefully Sri is still at Akamai?

    Looks good to me.

    Thanks
    -Sri