From: Peter Zijlstra <peterz@infradead.org>
To: Tejun Heo <htejun@fb.com>
Cc: Tejun Heo <tj@kernel.org>,
torvalds@linux-foundation.org, akpm@linux-foundation.org,
mingo@redhat.com, axboe@kernel.dk, tytso@mit.edu, jack@suse.com,
adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-team@fb.com, mingbo@fb.com
Subject: Re: [PATCH 1/4] sched: move IO scheduling accounting from io_schedule_timeout() to __schedule()
Date: Sat, 29 Oct 2016 05:21:26 +0200 [thread overview]
Message-ID: <20161029032126.GH3568@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <20161028191231.GA29044@htj.duckdns.org>
On Fri, Oct 28, 2016 at 03:12:32PM -0400, Tejun Heo wrote:
> Hello, Peter.
>
> On Fri, Oct 28, 2016 at 09:07:02PM +0200, Peter Zijlstra wrote:
> > One alternative is to inherit the iowait state of the task we block on.
> > That'll not get rid of the branches much, but it will remove the new
> > mutex APIs.
>
> Yeah, thought about that briefly but we don't necessarily track mutex
This one I actually fixed and should be in -next. And it would be
sufficient to cover the use case here.
> or other synchronization construct owners, things get gnarly with
> rwsems (the inode ones sometimes end up in a similar situation), and
> we'll probably end up dealing with some surprising propagations down
> the line.
rwsems could be done for writers only.
next prev parent reply other threads:[~2016-10-29 3:21 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-28 16:58 [PATCHSET RFC] sched, jbd2: mark sleeps on journal->j_checkpoint_mutex as iowait Tejun Heo
2016-10-28 16:58 ` [PATCH 1/4] sched: move IO scheduling accounting from io_schedule_timeout() to __schedule() Tejun Heo
2016-10-28 18:27 ` Peter Zijlstra
2016-10-28 19:07 ` Peter Zijlstra
2016-10-28 19:12 ` Tejun Heo
2016-10-29 3:21 ` Peter Zijlstra [this message]
2016-10-31 16:45 ` Tejun Heo
2016-12-06 21:30 ` Tejun Heo
2016-11-03 15:33 ` Pavan Kondeti
2016-11-08 22:51 ` Tejun Heo
2016-12-06 21:29 ` [PATCH v2 " Tejun Heo
2016-12-07 9:35 ` Peter Zijlstra
2016-12-07 20:48 ` [PATCH v3 1/4] sched: move IO scheduling accounting from io_schedule_timeout() into scheduler Tejun Heo
2017-01-14 12:49 ` [tip:sched/core] sched/core: " tip-bot for Tejun Heo
2016-10-28 16:58 ` [PATCH 2/4] sched: separate out io_schedule_prepare() and io_schedule_finish() Tejun Heo
2017-01-14 12:49 ` [tip:sched/core] sched/core: Separate " tip-bot for Tejun Heo
2016-10-28 16:58 ` [PATCH 3/4] mutex: add mutex_lock_io() Tejun Heo
2017-01-14 12:50 ` [tip:sched/core] locking/mutex, sched/wait: Add mutex_lock_io() tip-bot for Tejun Heo
2017-01-14 14:13 ` Mike Galbraith
2017-01-14 16:10 ` Ingo Molnar
2016-10-28 16:58 ` [PATCH 4/4] jbd2: use mutex_lock_io() for journal->j_checkpoint_mutex Tejun Heo
2017-01-14 12:51 ` [tip:sched/core] fs/jbd2, locking/mutex, sched/wait: Use " tip-bot for Tejun Heo
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