Re: [PATCH v2 1/1] psi: stop relying on timer_pending for poll_work rescheduling
From: Suren Baghdasaryan <surenb@google.com>
Date: 2021-07-01 16:09:40
Also in:
linux-mediatek, lkml
On Thu, Jul 1, 2021 at 1:59 AM Peter Zijlstra [off-list ref] wrote:
On Wed, Jun 30, 2021 at 01:51:51PM -0700, Suren Baghdasaryan wrote:quoted
+ /* cmpxchg should be called even when !force to set poll_scheduled */ + if (atomic_cmpxchg(&group->poll_scheduled, 0, 1) && !force) return;Why is that a cmpxchg() ?
We want to set poll_scheduled and proceed with rescheduling the timer unless it's already scheduled, so cmpxchg helps us to make that decision atomically. Or did I misunderstand your question?
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