From: Lai Jiangshan <[email protected]>
Patch1-3 are fixes for prematurely wakeups and patch4-8 are cleanups.
Patch2 fixes when prematurely wakeup happens after kthread_bind_mask().
Patch3 fixes when prematurely wakeup happens before kthread_bind_mask().
Patch1 prepares for patch2-3.
Like Petr's patch[1], a completion is introduced to do the synchronization,
but the synchronization is done in a different direction which allows the
newly created worker itself do some initialization instead of the manager
and allows for a more simplified code.
(The changed synchronization direction is not necessarily better.)
And make workqueue code less dependence on the semantics that kthread
provides.
[1]: https://lore.kernel.org/all/[email protected]/
Cc: Linus Torvalds <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Tejun Heo <[email protected]>,
Cc: Petr Mladek <[email protected]>
Cc: Michal Hocko <[email protected]>,
Cc: Peter Zijlstra <[email protected]>,
Cc: Wedson Almeida Filho <[email protected]>
Lai Jiangshan (8):
workqueue: Unconditionally set cpumask in worker_attach_to_pool()
workqueue: Make create_worker() safe against prematurely wakeups
workqueue: Set PF_NO_SETAFFINITY instead of kthread_bind_mask()
workqueue: Set/Clear PF_WQ_WORKER while attaching/detaching
workqueue: Use worker_set_flags() in worker_enter_idle()
workqueue: Simplify the starting of the newly created worker
workqueue: Remove the outer loop in maybe_create_worker()
workqueue: Move the locking out of maybe_create_worker()
kernel/workqueue.c | 123 +++++++++++++++---------------------
kernel/workqueue_internal.h | 11 +++-
2 files changed, 60 insertions(+), 74 deletions(-)
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2.19.1.6.gb485710b