mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-07 19:49:33 -04:00
2285e1496d
Once there is a heavy IO load, so many encrypt/decrypt work will occupy all of the cpu, which may lead to the poor performance for other service. So the improved visibility and controls over dm-crypt workqueues, as was offered with commita2b8b2d975("dm crypt: export sysfs of kcryptd workqueue"), seems necessary. By exporting dm-crypt's workqueues in sysfs, the entry like cpumask/max_active and so on can help us to limit the CPU usage for encrypt/decrypt work. However, commita2b8b2d975did not consider that DM table reload will call .ctr before .dtr, so the reload for dm-crypt failed because the same sysfs name was present. This was the original need for commit48b0777cd9("Revert "dm crypt: export sysfs of kcryptd workqueue""). Reintroduce the use of WQ_SYSFS, and use it for both the IO and crypt workqueues, but make the workqueue names include a unique id (via ida) to allow both old and new sysfs entries to coexist. Signed-off-by: yangerkun <yangerkun@huawei.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
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.