linux-kernel - Re: [PATCH] aio: Use call_rcu() instead of synchronize_rcu() in kill

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Message-ID: <20130529091808.GS22724@kernel.dk>
Date:	Wed, 29 May 2013 11:18:08 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-aio@...ck.org,
	Zach Brown <zab@...hat.com>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <jlbec@...lplan.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Asai Thambi S P <asamymuthupa@...ron.com>,
	Selvan Mani <smani@...ron.com>,
	Sam Bradshaw <sbradshaw@...ron.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Benjamin LaHaise <bcrl@...ck.org>
Subject: Re: [PATCH] aio: Use call_rcu() instead of synchronize_rcu() in
 kill_ioctx()

On Tue, May 28 2013, Kent Overstreet wrote:
> Just making ioctx shutdown asynchronous so as not to block io_destroy()
> - and percpu refcounts for the ioctx are going to need a RCU barrier in
> the same place anyways.

Works for me, and gets rid of that nasty regression on taking forever to
tear things down. You can add my Tested-by.

-- 
Jens Axboe

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