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

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Message-ID: <20120710154829.GA9222@suse.de>
Date:	Tue, 10 Jul 2012 16:48:30 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	JoonSoo Kim <js1304@...il.com>
Cc:	David Rientjes <rientjes@...gle.com>, 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

On Wed, Jul 11, 2012 at 12:24:41AM +0900, JoonSoo Kim wrote:
> > That would be functionally similar to your patch but it will preserve git
> > blame, churn less code and be harder to make mistakes with in the unlikely
> > event a third call to alloc_pages_direct_compact is ever added.
> 
> Your suggestion looks good.
> But, the size of page_alloc.o is more than before.
> 
> I test 3 approaches, vanilla, always_inline and
> wrapping(alloc_page_direct_compact which is your suggestion).
> In my environment (v3.5-rc5, gcc 4.6.3, x86_64), page_alloc.o shows
> below number.
> 
>                                          total, .text section, .text.unlikely
> page_alloc_vanilla.o:     93432,   0x510a,        0x243
> page_alloc_inline.o:       93336,   0x52ca,          0xa4
> page_alloc_wrapping.o: 93528,   0x515a,        0x238
> 
> Andrew said that inlining add only 26 bytes to .text of page_alloc.o,
> but in my system, need more bytes.
> Currently, I think this patch doesn't have obvious benefit, so I want
> to drop it.
> Any objections?
> 

No objections to dropping the patch. It was at worth looking at so thanks
for that.

-- 
Mel Gorman
SUSE Labs
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