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

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Message-ID: <AANLkTinZaSchq6UKUkiaFTrmdHMpY7x4uN886r7iXeYU@mail.gmail.com>
Date:	Mon, 1 Nov 2010 15:41:06 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Jens Axboe <axboe@...nel.dk>, 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 2010-10-30 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.
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