linux-kernel - [PATCH 0/1] aio: change exit_aio() to load mm->ioctx_table once and avoid rcu_read

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Message-ID: <20140429183915.GA32513@redhat.com>
Date:	Tue, 29 Apr 2014 20:39:15 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Kent Overstreet <kmo@...erainc.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>, linux-aio@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/1] aio: change exit_aio() to load mm->ioctx_table once
	and avoid rcu_read_lock()

Completely untested and I know nothing about aio, thus needs an ack
from maintainers or should be ignored.

But exit_aio() looks "obviously unnecessarily overcomplicated", I was
really puzzled when I looked at this code by accident.

Kent, could you also explain kioctx->dead is atomic_t? This looks
pointless? afaics atomic_ buys nothing in this case.

Oleg.

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