linux-kernel - Re: [PATCH 21/33] aio: reqs_active -> reqs

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Message-ID: <20130402154836.GE31577@thunk.org>
Date:	Tue, 2 Apr 2013 11:48:36 -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 21/33] aio: reqs_active -> reqs_available

On Thu, Mar 21, 2013 at 09:35:42AM -0700, Kent Overstreet wrote:
> The number of outstanding kiocbs is one of the few shared things left that
> has to be touched for every kiocb - it'd be nice to make it percpu.
> 
> We can make it per cpu by treating it like an allocation problem: we have
> a maximum number of kiocbs that can be outstanding (i.e.  slots) - then we
> just allocate and free slots, and we know how to write per cpu allocators.
> 
> So as prep work for that, we convert reqs_active to reqs_available.

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

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