Checking for required dependencies of the last commit above:
---
Commits in-between the first offender and final fix, in the development
branch:
$ git log --oneline origin/master --
sysdeps/unix/sysv/linux/getsysstats.c | grep -v 'Update copyright dates'
472894d2cfee malloc: Use __get_nprocs on arena_get2 (BZ 30945)
97a912f7a832 linux: Use /sys/devices/system/cpu on __get_nprocs_conf
(BZ#28991)
e1d32b836410 linux: fix accuracy of get_nprocs and get_nprocs_conf [BZ
#28865]
97ba273b5057 linux: __get_nprocs_sched: do not feed CPU_COUNT_S with
garbage [BZ #28850]
(below: same commit IDs)
137ed5ac440a linux: Use /proc/stat fallback for __get_nprocs_conf (BZ
#28624)
342298278eab linux: Revert the use of sched_getaffinity on get_nproc
(BZ #28310)
33099d72e41c linux: Simplify get_nprocs
11a02b035b46 misc: Add __get_nprocs_sched
30891f35fa7d Remove "Contributed by" lines
eb68d7d23cc4 Linux: Avoid calling malloc indirectly from __get_nprocs
f13fb81ad315 linux: Remove /proc/cpuinfo fallback on alpha and sparc
903bc7dcc2ac linux: Use sched_getaffinity for __get_nprocs (BZ #27645)
<...>
Likewise, in the 2.35 release branch (used by Jammy).
All commits present, the most-recent 3 are backports.
(commit 97a912f7a832 has not been backported to 2.35.)
$ git log --oneline origin/release/2.35/master --
sysdeps/unix/sysv/linux/getsysstats.c | grep -v 'Update copyright da
tes'
d47c5e4db792 malloc: Use __get_nprocs on arena_get2 (BZ 30945)
491f2ef1f0ff linux: fix accuracy of get_nprocs and get_nprocs_conf [BZ
#28865]
a2f1675634b3 linux: __get_nprocs_sched: do not feed CPU_COUNT_S with
garbage [BZ #28850]
(below: same commit IDs)
137ed5ac440a linux: Use /proc/stat fallback for __get_nprocs_conf (BZ
#28624)
342298278eab linux: Revert the use of sched_getaffinity on get_nproc
(BZ #28310)
33099d72e41c linux: Simplify get_nprocs
11a02b035b46 misc: Add __get_nprocs_sched
30891f35fa7d Remove "Contributed by" lines
eb68d7d23cc4 Linux: Avoid calling malloc indirectly from __get_nprocs
f13fb81ad315 linux: Remove /proc/cpuinfo fallback on alpha and sparc
903bc7dcc2ac linux: Use sched_getaffinity for __get_nprocs (BZ #27645)
Applied in jammy (glibc 2.35-0ubuntu3.8)
491f2ef1f0ff linux: fix accuracy of get_nprocs and get_nprocs_conf [BZ
#28865]
a2f1675634b3 linux: __get_nprocs_sched: do not feed CPU_COUNT_S with
garbage [BZ #28850]
Missing in jammy
d47c5e4db792 malloc: Use __get_nprocs on arena_get2 (BZ 30945)
So, from the 2.35 branch, only this commit (which is the desired commit) is
missing.
Its dependencies (prior commits to improve __get_nprocs) are already applied.
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https://bugs.launchpad.net/bugs/2089789
Title:
malloc performance degradation with CPU affinity masks
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