[Bug malloc/31556] New: Malloc is not cgroup aware

[Bug malloc/31556] New: Malloc is not cgroup aware

[Sean.Dukehart at ssa dot gov]

https://sourceware.org/bugzilla/show_bug.cgi?id=31556

            Bug ID: 31556
           Summary: Malloc is not cgroup aware
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: malloc
          Assignee: unassigned at sourceware dot org
          Reporter: Sean.Dukehart at ssa dot gov
  Target Milestone: ---

I'm not 100% sure that this is genuinely a bug or if it's by design. 

But my Java application running in a Kubernetes environment with calls out to
native code via JNI eventually runs out of native memory. Eventually, I came
across https://github.com/prestodb/presto/issues/8993 &
https://www.gnu.org/software/libc/manual/html_node/Memory-Allocation-Tunables.html#index-glibc_002emalloc_002earena_005fmax,
which indicates the default of glibc.malloc.arena_max is "The default value of
this tunable is 0, meaning that the limit on the number of arenas is determined
by the number of CPU cores online. For 32-bit systems the limit is twice the
number of cores online and on 64-bit systems, it is 8 times the number of cores
online."

Digging into the code:
*
https://github.com/bminor/glibc/blob/1ea051145612f199d8716ecdf78b084b00b5a727/malloc/arena.c#L834-L841
* https://github.com/bminor/glibc/blob/master/malloc/malloc.c#L1921
*
https://github.com/bminor/glibc/blob/dc1a77269c971652a8a5167ec366792eae052e65/sysdeps/unix/sysv/linux/getsysstats.c#L213-L222

it doesn't appear that the malloc arena logic is taking into consideration
cgroup CPU limits. 

I'm out of my league here, but was wondering if this was by design, or if there
was an alternative cgroup-aware version of malloc or approach that should be
used.

Thanks!

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[Bug malloc/31556] Malloc is not cgroup aware

[Sean.Dukehart at ssa dot gov]

https://sourceware.org/bugzilla/show_bug.cgi?id=31556

Sean Dukehart <Sean.Dukehart at ssa dot gov> changed:

           What    |Removed                     |Added
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                 CC|                            |Sean.Dukehart at ssa dot gov

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