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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug malloc/30723] Repeated posix_memalign calls produce long free
 lists, high fragmentation
Date: Tue, 15 Aug 2023 06:25:29 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30723

--- Comment #5 from Florian Weimer <fweimer at redhat dot com> ---
Second part committed:

commit 0dc7fc1cf094406a138e4d1bcf9553e59edcf89d
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Aug 10 19:36:56 2023 +0200

    malloc: Remove bin scanning from memalign (bug 30723)

    On the test workload (mpv --cache=3Dyes with VP9 video decoding), the
    bin scanning has a very poor success rate (less than 2%).  The tcache
    scanning has about 50% success rate, so keep that.

    Update comments in malloc/tst-memalign-2 to indicate the purpose
    of the tests.  Even with the scanning removed, the additional
    merging opportunities since commit 542b1105852568c3ebc712225ae78b
    ("malloc: Enable merging of remainders in memalign (bug 30723)")
    are sufficient to pass the existing large bins test.

    Remove leftover variables from _int_free from refactoring in the
    same commit.

    Reviewed-by: DJ Delorie <dj@redhat.com>

I will handle the 2.38 backport after a brief delay.

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