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kthread: Comment on the purpose and placement of kthread_affine_node() call

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It may not appear obvious why kthread_affine_node() is not called before
the kthread creation completion instead of after the first wake-up.

The reason is that kthread_affine_node() applies a default affinity
behaviour that only takes place if no affinity preference have already
been passed by the kthread creation call site.

Add a comment to clarify that.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Marco Crivellari <marco.crivellari@suse.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Waiman Long <longman@redhat.com>
This commit is contained in:
Frederic Weisbecker
2025-06-18 16:52:04 +02:00
parent e894f63398
commit 60ba9c38b9
1 changed files with 4 additions and 0 deletions
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4
kernel/kthread.c
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@@ -453,6 +453,10 @@ static int kthread(void *_create)
self->started = 1;
/*
* Apply default node affinity if no call to kthread_bind[_mask]() nor
* kthread_affine_preferred() was issued before the first wake-up.
*/
if (!(current->flags & PF_NO_SETAFFINITY) && !self->preferred_affinity)
kthread_affine_node();