linux-kernel - Re: [PATCH 17 of 66] add pmd mangling generic functions

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Date:	Thu, 18 Nov 2010 09:32:36 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrea Arcangeli <aarcange@...hat.com>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 17 of 66] add pmd mangling generic functions

On Thu, Nov 18, 2010 at 4:52 AM, Mel Gorman <mel@....ul.ie> wrote:
> On Wed, Nov 03, 2010 at 04:27:52PM +0100, Andrea Arcangeli wrote:
>> From: Andrea Arcangeli <aarcange@...hat.com>
>>
>> Some are needed to build but not actually used on archs not supporting
>> transparent hugepages. Others like pmdp_clear_flush are used by x86 too.
>>
>> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
>> Acked-by: Rik van Riel <riel@...hat.com>
>
> Acked-by: Mel Gorman <mel@....ul.ie>

I dunno. Those macros are _way_ too big and heavy to be macros or
inline functions. Why aren't pmdp_splitting_flush() etc just
functions?

There is no performance advantage to inlining them - the TLB flush is
going to be expensive enough that there's no point in avoiding a
function call. And that header file really does end up being _really_
ugly.

                      Linus
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