linux-kernel - Re: [PATCH] Optimize relay_alloc_page_array() slightly by using vzalloc rather than vmalloc and memset

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Message-ID: <20101101182625.GA20005@Krystal>
Date:	Mon, 1 Nov 2010 14:26:25 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	Jens Axboe <axboe@...nel.dk>, Pekka Enberg <penberg@...nel.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tom Zanussi <zanussi@...ibm.com>,
	Karim Yaghmour <karim@...rsys.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] Optimize relay_alloc_page_array() slightly by using
	vzalloc rather than vmalloc and memset

* Jesper Juhl (jj@...osbits.net) wrote:
> On Mon, 1 Nov 2010, Mathieu Desnoyers wrote:
> 
> > * Jens Axboe (axboe@...nel.dk) wrote:
> > > On 2010-11-01 09:41, Pekka Enberg wrote:
> > > > * Jens Axboe (axboe@...nel.dk) wrote:
> > > >>> On 2010-10-30 17:47, Mathieu Desnoyers wrote:
> > > >>>> BLK_DEV_IO_TRACE seems to still select RELAY. Has it completed its
> > > >>>> transition to either Ftrace or Perf ? Depending on Jens, moving blktrace
> > > >>>> relay dependency to the Generic Ring Buffer Library might be a good
> > > >>>> option to consider.
> > > >>>
> > > >>> The blktrace user bits is still (by far) the most wide spread way that
> > > >>> blktrace is used in the field, and those still rely on relayfs. So no,
> > > >>> we can't kill it now.
> > > > 
> > > > On Mon, Nov 1, 2010 at 3:08 PM, Mathieu Desnoyers
> > > > <mathieu.desnoyers@...ymtl.ca> wrote:
> > > >> What I am proposing is that the Generic Ring Buffer Library could
> > > >> replace relayfs without changing any of the interfaces blktrace exposes
> > > >> to user-space. Indeed, I would not remove relayfs unless there was a
> > > >> replacement.
> > > > 
> > > > We don't in general NAK cleanups because of future features or
> > > > removals that may or may not happen.
> > > 
> > > Agree, this is parallel to whether or not we can transition blktrace to
> > > using the generic ring buffer library or not. If the current patch
> > > proposed makes sense, then it should go in regardless of
> > > potential/future plans.
> > 
> > Agreed. Thanks,
> > 
> 
> As I read the discussion over the last day or so, since I last checked my 
> mail, there are no longer any objections to the patch. Correct?

Yes,

Acked-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>

> If that's the case, who will merge it? and should I resend it with various 
> peoples Acked-by: lines? or?

Yep, this might make the maintainer's work easier, I think. As for who
will merge it, good question. Andrew ?

Thanks,

Mathieu

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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