mirror of
https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9.git
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CKI KWF Bot
406e208e0c
MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/8401 JIRA: https://redhat.atlassian.net/browse/RHEL-212733 MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/8401 Omitted-fix: fa188edc671d ("linux/bitfield.h: replace __auto_type with auto") Omitted-fix: 8fedac321fb0 ("mm/mempolicy: fix weighted interleave auto sysfs name") Not needed because RHEL9 doesn't have commit e341f9c3c841 ("mm/mempolicy: Weighted Interleave Auto-tuning") which introduces the "auto" sysfs file. This MR backports commit a734d9fca84e ("futex: Optimize futex hash bucket access patterns") to improve the futex hashing performance as measured by the "perf bench futex hash" benchmark to a level comparable with that of RHEL 9.7. Patch 1 is a dependency that is used to simplify the backport. When running the “perf bench futex hash” benchmark on a 2-sock 96-thread CascadeLake test system, the test results before and after the patch are as follows: ``` Baseline Patched Delta -b 16 143,724 158,095 +10.0% -b 64 214,471 282,900 +32.0% -b 256 540,852 716,517 +32.5% -b 512 768,584 1,041,867 +35.6% -b 1024 964,341 1,277,484 +32.5% -b 4096 1,625,843 1,671,285 + 2.8% -b 16384 1,663,403 1,710,355 + 2.8% -b 65536 1,747,447 1,819,797 + 4.1% ``` Signed-off-by: Waiman Long <longman@redhat.com> Approved-by: Rafael Aquini <raquini@redhat.com> Approved-by: Phil Auld <pauld@redhat.com> Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com> Merged-by: CKI GitLab Kmaint Pipeline Bot <26919896-cki-kmaint-pipeline-bot@users.noreply.gitlab.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.