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Date: Mon, 29 Jun 2009 09:17:41 +0900
From: Minchan Kim <minchan.kim@...il.com>
To: Wu Fengguang <fengguang.wu@...el.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Minchan Kim <minchan.kim@...il.com>,
Johannes Weiner <hannes@...xchg.org>,
David Howells <dhowells@...hat.com>,
"riel@...hat.com" <riel@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>,
Christoph Lameter <cl@...ux-foundation.org>,
"peterz@...radead.org" <peterz@...radead.org>,
"tytso@....edu" <tytso@....edu>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"elladan@...imo.com" <elladan@...imo.com>,
"npiggin@...e.de" <npiggin@...e.de>,
"Barnes, Jesse" <jesse.barnes@...el.com>
Subject: Re: Found the commit that causes the OOMs
On Sun, 28 Jun 2009 23:10:26 +0800
Wu Fengguang <fengguang.wu@...el.com> wrote:
> On Sun, Jun 28, 2009 at 11:01:40PM +0800, KOSAKI Motohiro wrote:
> > > Yes, smaller inactive_anon means smaller (pointless) nr_scanned,
> > > and therefore less slab scans. Strictly speaking, it's not the fault
> > > of your patch. It indicates that the slab scan ratio algorithm should
> > > be updated too :)
> >
> > I don't think this patch is related to minchan's patch.
> > but I think this patch is good.
>
> OK.
>
> >
> > > We could refine the estimation of "reclaimable" pages like this:
> >
> > hmhm, reasonable idea.
>
> Thank you.
>
> > >
> > > diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
> > > index 416f748..e9c5b0e 100644
> > > --- a/include/linux/vmstat.h
> > > +++ b/include/linux/vmstat.h
> > > @@ -167,14 +167,7 @@ static inline unsigned long zone_page_state(struct zone *zone,
> > > }
> > >
> > > extern unsigned long global_lru_pages(void);
> > > -
> > > -static inline unsigned long zone_lru_pages(struct zone *zone)
> > > -{
> > > - return (zone_page_state(zone, NR_ACTIVE_ANON)
> > > - + zone_page_state(zone, NR_ACTIVE_FILE)
> > > - + zone_page_state(zone, NR_INACTIVE_ANON)
> > > - + zone_page_state(zone, NR_INACTIVE_FILE));
> > > -}
> > > +extern unsigned long zone_lru_pages(void);
> > >
> > > #ifdef CONFIG_NUMA
> > > /*
> > > diff --git a/mm/vmscan.c b/mm/vmscan.c
> > > index 026f452..4281c6f 100644
> > > --- a/mm/vmscan.c
> > > +++ b/mm/vmscan.c
> > > @@ -2123,10 +2123,31 @@ void wakeup_kswapd(struct zone *zone, int order)
> > >
> > > unsigned long global_lru_pages(void)
> > > {
> > > - return global_page_state(NR_ACTIVE_ANON)
> > > - + global_page_state(NR_ACTIVE_FILE)
> > > - + global_page_state(NR_INACTIVE_ANON)
> > > - + global_page_state(NR_INACTIVE_FILE);
> > > + int nr;
> > > +
> > > + nr = global_page_state(zone, NR_ACTIVE_FILE) +
> > > + global_page_state(zone, NR_INACTIVE_FILE);
> > > +
> > > + if (total_swap_pages)
> > > + nr += global_page_state(zone, NR_ACTIVE_ANON) +
> > > + global_page_state(zone, NR_INACTIVE_ANON);
> > > +
> > > + return nr;
> > > +}
> >
> > Please change function name too.
> > Now, this function only account reclaimable pages.
>
> Good suggestion - I did considered renaming them to *_relaimable_pages.
>
> > Plus, total_swap_pages is bad. if we need to concern "reclaimable
> > pages", we should use nr_swap_pages.
>
> > I mean, swap-full also makes anon is unreclaimable althouth system
> > have sone swap device.
>
> Right, changed to (nr_swap_pages > 0).
>
> Thanks,
> Fengguang
> ---
>
> diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
> index 416f748..8d8aa20 100644
> --- a/include/linux/vmstat.h
> +++ b/include/linux/vmstat.h
> @@ -166,15 +166,8 @@ static inline unsigned long zone_page_state(struct zone *zone,
> return x;
> }
>
> -extern unsigned long global_lru_pages(void);
> -
> -static inline unsigned long zone_lru_pages(struct zone *zone)
> -{
> - return (zone_page_state(zone, NR_ACTIVE_ANON)
> - + zone_page_state(zone, NR_ACTIVE_FILE)
> - + zone_page_state(zone, NR_INACTIVE_ANON)
> - + zone_page_state(zone, NR_INACTIVE_FILE));
> -}
> +extern unsigned long global_reclaimable_pages(void);
> +extern unsigned long zone_reclaimable_pages(void);
>
> #ifdef CONFIG_NUMA
> /*
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index a91b870..74c3067 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -394,7 +394,8 @@ static unsigned long highmem_dirtyable_memory(unsigned long total)
> struct zone *z =
> &NODE_DATA(node)->node_zones[ZONE_HIGHMEM];
>
> - x += zone_page_state(z, NR_FREE_PAGES) + zone_lru_pages(z);
> + x += zone_page_state(z, NR_FREE_PAGES) +
> + zone_reclaimable_pages(z);
> }
> /*
> * Make sure that the number of highmem pages is never larger
> @@ -418,7 +419,7 @@ unsigned long determine_dirtyable_memory(void)
> {
> unsigned long x;
>
> - x = global_page_state(NR_FREE_PAGES) + global_lru_pages();
> + x = global_page_state(NR_FREE_PAGES) + global_reclaimable_pages();
>
> if (!vm_highmem_is_dirtyable)
> x -= highmem_dirtyable_memory(x);
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 026f452..3768332 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1693,7 +1693,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
> if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
> continue;
>
> - lru_pages += zone_lru_pages(zone);
> + lru_pages += zone_reclaimable_pages(zone);
> }
> }
>
> @@ -1910,7 +1910,7 @@ loop_again:
> for (i = 0; i <= end_zone; i++) {
> struct zone *zone = pgdat->node_zones + i;
>
> - lru_pages += zone_lru_pages(zone);
> + lru_pages += zone_reclaimable_pages(zone);
> }
>
> /*
> @@ -1954,7 +1954,7 @@ loop_again:
> if (zone_is_all_unreclaimable(zone))
> continue;
> if (nr_slab == 0 && zone->pages_scanned >=
> - (zone_lru_pages(zone) * 6))
> + (zone_reclaimable_pages(zone) * 6))
> zone_set_flag(zone,
> ZONE_ALL_UNRECLAIMABLE);
> /*
> @@ -2121,12 +2121,33 @@ void wakeup_kswapd(struct zone *zone, int order)
> wake_up_interruptible(&pgdat->kswapd_wait);
> }
>
> -unsigned long global_lru_pages(void)
> +unsigned long global_reclaimable_pages(void)
> {
> - return global_page_state(NR_ACTIVE_ANON)
> - + global_page_state(NR_ACTIVE_FILE)
> - + global_page_state(NR_INACTIVE_ANON)
> - + global_page_state(NR_INACTIVE_FILE);
> + int nr;
> +
> + nr = global_page_state(zone, NR_ACTIVE_FILE) +
> + global_page_state(zone, NR_INACTIVE_FILE);
> +
> + if (total_swap_pages)
Dont' we have to change from total_swap_pages to nr_swap_pages, too ?
> + nr += global_page_state(zone, NR_ACTIVE_ANON) +
> + global_page_state(zone, NR_INACTIVE_ANON);
> +
> + return nr;
> +}
> +
> +
> +unsigned long zone_reclaimable_pages(struct zone *zone)
> +{
> + int nr;
> +
> + nr = zone_page_state(zone, NR_ACTIVE_FILE) +
> + zone_page_state(zone, NR_INACTIVE_FILE);
> +
> + if (nr_swap_pages > 0)
> + nr += zone_page_state(zone, NR_ACTIVE_ANON) +
> + zone_page_state(zone, NR_INACTIVE_ANON);
> +
> + return nr;
> }
>
> #ifdef CONFIG_HIBERNATION
> @@ -2198,7 +2219,7 @@ unsigned long shrink_all_memory(unsigned long nr_pages)
>
> current->reclaim_state = &reclaim_state;
>
> - lru_pages = global_lru_pages();
> + lru_pages = global_reclaimable_pages();
> nr_slab = global_page_state(NR_SLAB_RECLAIMABLE);
> /* If slab caches are huge, it's better to hit them first */
> while (nr_slab >= lru_pages) {
> @@ -2240,7 +2261,7 @@ unsigned long shrink_all_memory(unsigned long nr_pages)
>
> reclaim_state.reclaimed_slab = 0;
> shrink_slab(sc.nr_scanned, sc.gfp_mask,
> - global_lru_pages());
> + global_reclaimable_pages());
> sc.nr_reclaimed += reclaim_state.reclaimed_slab;
> if (sc.nr_reclaimed >= nr_pages)
> goto out;
> @@ -2257,7 +2278,8 @@ unsigned long shrink_all_memory(unsigned long nr_pages)
> if (!sc.nr_reclaimed) {
> do {
> reclaim_state.reclaimed_slab = 0;
> - shrink_slab(nr_pages, sc.gfp_mask, global_lru_pages());
> + shrink_slab(nr_pages, sc.gfp_mask,
> + global_reclaimable_pages());
> sc.nr_reclaimed += reclaim_state.reclaimed_slab;
> } while (sc.nr_reclaimed < nr_pages &&
> reclaim_state.reclaimed_slab > 0);
--
Kinds Regards
Minchan Kim
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