linux-kernel - Re: [PATCH V4 4/4] mm: microoptimize zonelist operations

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Message-ID: <54ACF93B.3060801@suse.cz>
Date:	Wed, 07 Jan 2015 10:15:39 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Minchan Kim <minchan@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH V4 4/4] mm: microoptimize zonelist operations

On 01/06/2015 04:09 PM, Michal Hocko wrote:
> On Mon 05-01-15 18:17:43, Vlastimil Babka wrote:
>> The function next_zones_zonelist() returns zoneref pointer, as well as zone
>> pointer via extra parameter. Since the latter can be trivially obtained by
>> dereferencing the former, the overhead of the extra parameter is unjustified.
>> 
>> This patch thus removes the zone parameter from next_zones_zonelist(). Both
>> callers happen to be in the same header file, so it's simple to add the
>> zoneref dereference inline. We save some bytes of code size.
> 
> Dunno. It makes first_zones_zonelist and next_zones_zonelist look
> different which might be a bit confusing. It's not a big deal but
> I am not sure it is worth it.

Yeah I thought that nobody uses them directly anyway thanks to
for_each_zone_zonelist* so it's not a big deal.
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