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Date: Mon, 1 Apr 2013 21:58:23 -0400
From: "Theodore Ts'o" <tytso@mit.edu>
To: Kent Overstreet <koverstreet@google.com>
Cc: linux-kernel@vger.kernel.org, linux-aio@kvack.org,
        akpm@linux-foundation.org, Zach Brown <zab@redhat.com>,
        Felipe Balbi <balbi@ti.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Mark Fasheh <mfasheh@suse.com>, Joel Becker <jlbec@evilplan.org>,
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        Selvan Mani <smani@micron.com>, Sam Bradshaw <sbradshaw@micron.com>,
        Jeff Moyer <jmoyer@redhat.com>, Al Viro <viro@zeniv.linux.org.uk>,
        Benjamin LaHaise <bcrl@kvack.org>
Subject: Re: [PATCH 14/33] aio: make aio_read_evt() more efficient, convert
 to hrtimers
Message-ID: <20130402015823.GC30122@thunk.org>
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	Kent Overstreet <koverstreet@google.com>,
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	Felipe Balbi <balbi@ti.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Mark Fasheh <mfasheh@suse.com>, Joel Becker <jlbec@evilplan.org>,
	Rusty Russell <rusty@rustcorp.com.au>, Jens Axboe <axboe@kernel.dk>,
	Asai Thambi S P <asamymuthupa@micron.com>,
	Selvan Mani <smani@micron.com>, Sam Bradshaw <sbradshaw@micron.com>,
	Jeff Moyer <jmoyer@redhat.com>, Al Viro <viro@zeniv.linux.org.uk>,
	Benjamin LaHaise <bcrl@kvack.org>
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On Thu, Mar 21, 2013 at 09:35:35AM -0700, Kent Overstreet wrote:
> Previously, aio_read_event() pulled a single completion off the ringbuffer
> at a time, locking and unlocking each time.  Change it to pull off as many
> events as it can at a time, and copy them directly to userspace.
> 
> This also fixes a bug where if copying the event to userspace failed,
> we'd lose the event.
> 
> Also convert it to wait_event_interruptible_hrtimeout(), which
> simplifies it quite a bit.

Reviewed-by: "Theodore Ts'o" <tytso@mit.edu>
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