linux-kernel - Re: [PATCH] mmtom: Prevent shrinking of active anon lru list in case of no swap space V3

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Message-ID: <2f11576a0905140754v39bbe5efv16b01fe4939c6814@mail.gmail.com>
Date:	Thu, 14 May 2009 23:54:07 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <barrioskmc@...il.com>
Cc:	MinChan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH] mmtom: Prevent shrinking of active anon lru list in case 
	of no swap space V3

2009/5/14 Minchan Kim <barrioskmc@...il.com>:
> On Thu, May 14, 2009 at 11:27 PM, KOSAKI Motohiro
> <kosaki.motohiro@...fujitsu.com> wrote:
>>>  mm/vmscan.c |    2 +-
>>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/mm/vmscan.c b/mm/vmscan.c
>>> index 2f9d555..621708f 100644
>>> --- a/mm/vmscan.c
>>> +++ b/mm/vmscan.c
>>> @@ -1577,7 +1577,7 @@ static void shrink_zone(int priority, struct zone *zone,
>>>         * Even if we did not try to evict anon pages at all, we want to
>>>         * rebalance the anon lru active/inactive ratio.
>>>         */
>>> -       if (inactive_anon_is_low(zone, sc))
>>> +       if (inactive_anon_is_low(zone, sc) && nr_swap_pages > 0)
>>>                shrink_active_list(SWAP_CLUSTER_MAX, zone, sc, priority, 0);
>>
>>
>>       if (nr_swap_pages > 0 && inactive_anon_is_low(zone, sc))
>>
>> is better?
>> compiler can't swap evaluate order around &&.
>
> If GCC optimizes away that branch with CONFIG_SWAP=n as Rik mentioned,
> we don't have a concern.

ok. I ack this.
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