linux-kernel - Re: [PATCH] shrink_all_memory() use sc.nr

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Message-ID: <2f11576a0902101241j5a006e09w46ecdbdb9c77e081@mail.gmail.com>
Date:	Wed, 11 Feb 2009 05:41:21 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	MinChan Kim <minchan.kim@...il.com>,
	Rik van Riel <riel@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	William Lee Irwin III <wli@...ementarian.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] shrink_all_memory() use sc.nr_reclaimed

>>  {
>>       struct zone *zone;
>> -     unsigned long nr_to_scan, ret = 0;
>> +     unsigned long nr_to_scan;
>>       enum lru_list l;
>
> Basing it on swsusp-clean-up-shrink_all_zones.patch probably makes it
> easier for Andrew to pick it up.

ok, thanks.

>>                       reclaim_state.reclaimed_slab = 0;
>> -                     shrink_slab(nr_pages, sc.gfp_mask, global_lru_pages());
>> -                     ret += reclaim_state.reclaimed_slab;
>> -             } while (ret < nr_pages && reclaim_state.reclaimed_slab > 0);
>> +                     shrink_slab(nr_pages, sc.gfp_mask,
>> +                                 global_lru_pages());
>> +                     sc.nr_reclaimed += reclaim_state.reclaimed_slab;
>> +             } while (sc.nr_reclaimed < nr_pages &&
>> +                      reclaim_state.reclaimed_slab > 0);
>
> :(
>
> Is this really an improvement?  `ret' is better to read than
> `sc.nr_reclaimed'.

I know it's debetable thing.
but I still think code consistency is important than variable name preference.
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