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3514309e03
Now in cpuset_attach(), we need to synchronously wait for flush_workqueue to complete. The execution time of flushing cpuset_migrate_mm_wq depends on the amount of mm migration initiated by cpusets at that time. When the cpuset.mems of a cgroup occupying a large amount of memory is modified, it may trigger extensive mm migration, causing cpuset_attach() to block on flush_workqueue for an extended period. This could be dangerous because cpuset_attach() is within the critical section of cgroup_mutex, which may ultimately cause all cgroup-related operations in the system to be blocked. This patch attempts to defer the flush_workqueue() operation until returning to userspace using the task_work which is originally proposed by tejun[1], so that flush happens after cgroup_mutex is dropped. That way we maintain the operation synchronicity while avoiding bothering anyone else. [1]: https://lore.kernel.org/cgroups/ZgMFPMjZRZCsq9Q-@slm.duckdns.org/T/#m117f606fa24f66f0823a60f211b36f24bd9e1883 Originally-by: Tejun Heo <tj@kernel.org> Signed-off-by: Chuyi Zhou <zhouchuyi@bytedance.com> Reviewed-by: Waiman Long <longman@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org> |
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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.