From: Peter Zijlstra <peterz@infradead.org>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: Ingo Molnar <mingo@redhat.com>,
quic_stummala@quicinc.com, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, quic_pkondeti@quicinc.com,
quic_sayalil@quicinc.com, quic_aiquny@quicinc.com,
quic_zljing@quicinc.com, quic_blong@quicinc.com,
quic_richardp@quicinc.com, quic_cdevired@quicinc.com,
Pradeep P V K <quic_pragalla@quicinc.com>
Subject: Re: [PATCH V1] fuse: give wakeup hints to the scheduler
Date: Tue, 7 Dec 2021 14:51:12 +0100 [thread overview]
Message-ID: <Ya9m0ME1pom49b+D@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <Ya9ljdrOkhBhhnJX@hirez.programming.kicks-ass.net>
On Tue, Dec 07, 2021 at 02:45:49PM +0100, Peter Zijlstra wrote:
> > What would be much nicer, is to look at all the threads on the waitq
> > and pick one that previously ran on the current CPU if there's one.
> > Could this be implemented?
>
> It would violate the FIFO semantics of _exclusive.
That said, look at
kernel/locking/percpu-rwsem.c:percpu_rwsem_wake_function() for how to do
really terrible things with waitqueues, possibly including what you
suggest.
next prev parent reply other threads:[~2021-12-07 13:51 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-06 8:46 [PATCH V1] fuse: give wakeup hints to the scheduler Pradeep P V K
2021-12-07 9:07 ` Miklos Szeredi
2021-12-07 10:07 ` Peter Zijlstra
2021-12-07 10:20 ` Miklos Szeredi
2021-12-07 10:41 ` Peter Zijlstra
2021-12-07 12:44 ` Miklos Szeredi
2021-12-07 13:45 ` Peter Zijlstra
2021-12-07 13:51 ` Peter Zijlstra [this message]
2021-12-07 14:03 ` Miklos Szeredi
2021-12-07 14:25 ` Peter Zijlstra
2021-12-08 15:46 ` Miklos Szeredi
2021-12-09 13:23 ` Shachar Sharon
2022-12-22 9:34 ` qixiaoyu
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