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

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Message-ID: <20101222061008.GJ7237@balbir.in.ibm.com>
Date:	Wed, 22 Dec 2010 11:40:08 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Minchan Kim <minchan.kim@...il.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)

* MinChan Kim <minchan.kim@...il.com> [2010-12-15 07:38:42]:

> 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.

Done, I renamed the function to zone_reclaim_pages.

Thanks!

-- 
	Three Cheers,
	Balbir
--
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