linux-kernel - Re: [PATCH] mm: don't invoke __alloc_pages_direct

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Message-ID: <CAAmzW4N+-xS65-NDJF2V9nzGDBTFC=20sZ8LJx5wCZ8=t7SpTQ@mail.gmail.com>
Date:	Sat, 7 Jul 2012 01:58:24 +0900
From:	JoonSoo Kim <js1304@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	akpm@...ux-foundation.org, Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: don't invoke __alloc_pages_direct_compact when order 0

2012/7/7 Minchan Kim <minchan@...nel.org>:
> Hi Joonsoo,
>
> On Sat, Jul 07, 2012 at 12:28:41AM +0900, Joonsoo Kim wrote:
>> __alloc_pages_direct_compact has many arguments so invoking it is very costly.
>
> It's already slow path so it's pointless for such optimization.

I know this is so minor optimization.
But why don't we do such a one?
Is there any weak point?

>> And in almost invoking case, order is 0, so return immediately.
>
> You can't make sure it.

Okay.

>>
>> Let's not invoke it when order 0
>
> Let's not ruin git blame.

Hmm...
When I do git blame, I can't find anything related to this.

Thanks for comments.
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