mirror of
https://github.com/torvalds/linux.git
synced 2024-11-21 19:41:42 +00:00
A mirror of the official Linux kernel repository just in case
85f0d8e39a
For unbound workqueue, pwqs usually map to just a few pools. Most of the time, pwqs will be linked sequentially to wq->pwqs list by cpu index. Usually, consecutive CPUs have the same workqueue attribute (e.g. belong to the same NUMA node). This makes pwqs with the same pool cluster together in the pwq list. Only do lock/unlock if the pool has changed in flush_workqueue_prep_pwqs(). This reduces the number of expensive lock operations. The performance data shows this change boosts FIO by 65x in some cases when multiple concurrent threads write to xfs mount points with fsync. FIO Benchmark Details - FIO version: v3.35 - FIO Options: ioengine=libaio,iodepth=64,norandommap=1,rw=write, size=128M,bs=4k,fsync=1 - FIO Job Configs: 64 jobs in total writing to 4 mount points (ramdisks formatted as xfs file system). - Kernel Codebase: v6.12-rc5 - Test Platform: Xeon 8380 (2 sockets) Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com> Signed-off-by: Wangyang Guo <wangyang.guo@intel.com> Reviewed-by: Lai Jiangshan <jiangshanlai@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org> |
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 reStructuredText 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.