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

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Message-ID: <20101214114542.GE14178@balbir.in.ibm.com>
Date:	Tue, 14 Dec 2010 17:15:42 +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> [2010-12-14 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.

> The function name is rather strange.
> It would be better to add scan_control setup in function inner to
> reclaim only unmapped pages.
> 
> -- 
> Kind regards,
> Minchan Kim

-- 
	Three Cheers,
	Balbir
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