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

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Message-ID: <4CCEC1E6.9010806@kernel.dk>
Date:	Mon, 01 Nov 2010 09:34:30 -0400
From:	Jens Axboe <axboe@...nel.dk>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC:	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

On 2010-11-01 09:08, Mathieu Desnoyers 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.
> 
> 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.

Sure, I'm open to such a solution as long as it doesn't slow anything
down for blktrace (primary concern, certainly) and retains feature
parity. I'm not married to relayfs, it's just what was available easily
when I added blktrace originally.

-- 
Jens Axboe

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