Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()

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To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Fri, 18 Sep 2015 18:02:21 +0200
Cc: Jens Axboe <axboe@xxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Frederic Weisbecker <fweisbec@xxxxxxxxx>, Chris Mason <clm@xxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Josef Bacik <jbacik@xxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, Neil Brown <neilb@xxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Tejun Heo <tj@xxxxxxxxxx>
In-reply-to: <20150918155956.GZ3816@twins.programming.kicks-ass.net>
User-agent: Mutt/1.5.21 (2012-12-30)

On Fri, Sep 18, 2015 at 05:59:56PM +0200, Peter Zijlstra wrote:
> >  - if it's not an actual PREEMPT_ACTIVE (ie in a random place)
> 
> PREEMPT_ACTIVE is actually a recursion flag, 'random place' does not
> factor into it. That is, most 'random places' will not have
> PREEMPT_ACTIVE set.

Ah, _not_ PREEMPT_ACTIVE, its late and I can't read no moar.
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References:
- Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
  - From: Linus Torvalds
- Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
  - From: Chris Mason
- Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
  - From: Dave Chinner
- Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
  - From: Linus Torvalds
- Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
  - From: Dave Chinner
- Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
  - From: Linus Torvalds
- Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
  - From: Chris Mason
- Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
  - From: Jens Axboe
- Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
  - From: Linus Torvalds
- Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()
  - From: Peter Zijlstra

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