linux-kernel - Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish

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Message-ID: <20150918160221.GF11639@twins.programming.kicks-ass.net>
Date:	Fri, 18 Sep 2015 18:02:21 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jens Axboe <axboe@...com>, Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Chris Mason <clm@...com>, Dave Chinner <david@...morbit.com>,
	Jan Kara <jack@...e.cz>, Josef Bacik <jbacik@...com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Neil Brown <neilb@...e.de>, Christoph Hellwig <hch@....de>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] fs-writeback: drop wb->list_lock during blk_finish_plug()

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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