[Bug 2089789] Re: malloc performance degradation with CPU affinity masks

[Mauricio Faria de Oliveira]

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.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to glibc in Ubuntu.
https://bugs.launchpad.net/bugs/2089789

Title:
  malloc performance degradation with CPU affinity masks

Status in glibc package in Ubuntu:
  Fix Released
Status in glibc source package in Jammy:
  Confirmed

Bug description:
  https://sourceware.org/bugzilla/show_bug.cgi?id=30945

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/2089789/+subscriptions