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From: "adhemerval.zanella at linaro dot org"
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Subject: [Bug malloc/20646] sysmalloc incorrectly fails with custom morecore
 function
Date: Tue, 31 Aug 2021 12:49:02 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D20646

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |adhemerval.zanella at lina=
ro dot o
                   |                            |rg

--- Comment #10 from Adhemerval Zanella <adhemerval.zanella at linaro dot o=
rg> ---
To give libhugetlsfs users a way forward, I think we should move the huge p=
ages
morecore functionatily to a tunable [1].  The __morecore returning
non-contiguous memory is not really well tests and have corner cases
specifically with memory trimming (specially because we set MORECORE_CONTIG=
UOUS
as default).

The approach I did [1] was that same as used for aarch64 memory tagging, wh=
ich
forces __glibc_morecore to always fails and makes sysmalloc fallbacks to
mmap().  I still need to check if all corner cases are handled correclty
(specially trimming).

[1] https://patchwork.sourceware.org/project/glibc/list/?series=3D2732
[2]
https://patchwork.sourceware.org/project/glibc/patch/20210830185215.449572-=
8-adhemerval.zanella@linaro.org/

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