linux-kernel - Re: [PATCH 2/3] Refactor zone

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Date:	Wed, 15 Dec 2010 07:38:42 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	linux-mm@...ck.org, akpm@...ux-foundation.org, npiggin@...nel.dk,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	kosaki.motohiro@...fujitsu.com, cl@...ux.com,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 2/3] Refactor zone_reclaim (v2)

On Tue, Dec 14, 2010 at 8:45 PM, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> * MinChan Kim <minchan.kim@...il.com> [2010-12-14 19:01:26]:
>
>> Hi Balbir,
>>
>> On Fri, Dec 10, 2010 at 11:31 PM, Balbir Singh
>> <balbir@...ux.vnet.ibm.com> wrote:
>> > Move reusable functionality outside of zone_reclaim.
>> > Make zone_reclaim_unmapped_pages modular
>> >
>> > Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
>> > ---
>> >  mm/vmscan.c |   35 +++++++++++++++++++++++------------
>> >  1 files changed, 23 insertions(+), 12 deletions(-)
>> >
>> > diff --git a/mm/vmscan.c b/mm/vmscan.c
>> > index e841cae..4e2ad05 100644
>> > --- a/mm/vmscan.c
>> > +++ b/mm/vmscan.c
>> > @@ -2815,6 +2815,27 @@ static long zone_pagecache_reclaimable(struct zone *zone)
>> >  }
>> >
>> >  /*
>> > + * Helper function to reclaim unmapped pages, we might add something
>> > + * similar to this for slab cache as well. Currently this function
>> > + * is shared with __zone_reclaim()
>> > + */
>> > +static inline void
>> > +zone_reclaim_unmapped_pages(struct zone *zone, struct scan_control *sc,
>> > +                               unsigned long nr_pages)
>> > +{
>> > +       int priority;
>> > +       /*
>> > +        * Free memory by calling shrink zone with increasing
>> > +        * priorities until we have enough memory freed.
>> > +        */
>> > +       priority = ZONE_RECLAIM_PRIORITY;
>> > +       do {
>> > +               shrink_zone(priority, zone, sc);
>> > +               priority--;
>> > +       } while (priority >= 0 && sc->nr_reclaimed < nr_pages);
>> > +}
>>
>> As I said previous version, zone_reclaim_unmapped_pages doesn't have
>> any functions related to reclaim unmapped pages.
>
> The scan control point has the right arguments for implementing
> reclaim of unmapped pages.

I mean you should set up scan_control setup in this function.
Current zone_reclaim_unmapped_pages doesn't have any specific routine
related to reclaim unmapped pages.
Otherwise, change the function name with just "zone_reclaim_pages". I
think you don't want it.

-- 
Kind regards,
Minchan Kim
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