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

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Message-ID: <20101101160030.GA7638@Krystal>
Date:	Mon, 1 Nov 2010 12:00:30 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Pekka Enberg <penberg@...nel.org>, Jesper Juhl <jj@...osbits.net>,
	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

* 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,

Mathieu

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