From: Peter Zijlstra <peterz@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jens Axboe <axboe@fb.com>, Ingo Molnar <mingo@kernel.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Chris Mason <clm@fb.com>, Dave Chinner <david@fromorbit.com>,
Jan Kara <jack@suse.cz>, Josef Bacik <jbacik@fb.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Neil Brown <neilb@suse.de>, Christoph Hellwig <hch@lst.de>,
Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
Date: Mon, 28 Sep 2015 16:47:57 +0200 [thread overview]
Message-ID: <20150928144757.GB2881@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <CA+55aFyUPuAHrwHewH7356y=tAw=M+o_d0J5CqjjaDMzxN2AEA@mail.gmail.com>
On Fri, Sep 18, 2015 at 09:12:38AM -0700, Linus Torvalds wrote:
>
> So I disagree with your notion that it's a recursion flag. It is
> absolutely nothing of the sort.
OK, agreed. I had it classed under recursion in my head, clearly I
indexed it sloppily. In any case I have a patch that kills off
PREEMPT_ACTIVE entirely.
I just have to clean it up, benchmark, split and write changelogs. But
it should be forthcoming 'soon'. As is, it boots..
> It gets set by preemption - and,
> somewhat illogically, by cond_resched().
I suspect that was done to make cond_resched() (voluntary preemption)
more robust and only have a single preemption path/logic. But all that
was done well before I got involved.
next prev parent reply other threads:[~2015-09-28 14:48 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-11 19:37 Chris Mason
2015-09-11 20:02 ` Linus Torvalds
2015-09-11 20:37 ` Linus Torvalds
2015-09-11 20:40 ` Josef Bacik
2015-09-11 21:04 ` Linus Torvalds
2015-09-11 22:06 ` Linus Torvalds
2015-09-11 23:16 ` Chris Mason
2015-09-11 23:36 ` Linus Torvalds
2015-09-12 0:52 ` Linus Torvalds
2015-09-12 2:15 ` Chris Mason
2015-09-12 2:27 ` Linus Torvalds
2015-09-12 23:00 ` Chris Mason
2015-09-12 23:29 ` Linus Torvalds
2015-09-12 23:46 ` Chris Mason
2015-09-13 13:12 ` Chris Mason
2015-09-13 22:56 ` Dave Chinner
2015-09-13 23:12 ` Dave Chinner
2015-09-14 20:06 ` Linus Torvalds
2015-09-16 15:16 ` Chris Mason
2015-09-16 19:58 ` Jan Kara
2015-09-16 20:00 ` Chris Mason
2015-09-16 22:07 ` Dave Chinner
2015-09-17 0:37 ` Dave Chinner
2015-09-17 1:12 ` Linus Torvalds
2015-09-17 2:14 ` Dave Chinner
2015-09-17 19:39 ` Linus Torvalds
2015-09-17 22:42 ` Chris Mason
2015-09-17 23:08 ` Linus Torvalds
2015-09-17 23:56 ` Chris Mason
2015-09-18 0:37 ` Dave Chinner
2015-09-18 1:50 ` Linus Torvalds
2015-09-18 5:40 ` Dave Chinner
2015-09-18 6:04 ` Linus Torvalds
2015-09-18 6:06 ` Linus Torvalds
2015-09-18 14:21 ` Jens Axboe
2015-09-18 13:16 ` Chris Mason
2015-09-18 14:23 ` Jens Axboe
2015-09-18 15:32 ` Linus Torvalds
2015-09-18 15:59 ` Peter Zijlstra
2015-09-18 16:02 ` Peter Zijlstra
2015-09-18 16:12 ` Linus Torvalds
2015-09-28 14:47 ` Peter Zijlstra [this message]
2015-09-28 16:08 ` Linus Torvalds
2015-09-29 7:55 ` Ingo Molnar
2015-09-18 22:17 ` Dave Chinner
2015-09-21 9:24 ` Jan Kara
2015-09-21 20:21 ` Andrew Morton
2015-09-17 23:03 ` Dave Chinner
2015-09-17 23:13 ` Linus Torvalds
2015-09-17 3:48 ` Chris Mason
2015-09-17 4:30 ` Dave Chinner
2015-09-17 12:13 ` Chris Mason
2015-09-11 23:06 ` Chris Mason
2015-09-11 23:13 ` Linus Torvalds
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