linux-kernel - Re: [PATCH 14/33] aio: make aio_read_evt() more efficient, convert to hrtimers

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Message-ID: <20130402015823.GC30122@thunk.org>
Date:	Mon, 1 Apr 2013 21:58:23 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-kernel@...r.kernel.org, linux-aio@...ck.org,
	akpm@...ux-foundation.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>,
	Jens Axboe <axboe@...nel.dk>,
	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 14/33] aio: make aio_read_evt() more efficient, convert
 to hrtimers

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@....edu>
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