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Date: Tue, 5 May 2009 11:46:10 +0900
From: Minchan Kim <barrioskmc@...il.com>
To: Wu Fengguang <fengguang.wu@...el.com>
Cc: "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
"cl@...ux-foundation.org" <cl@...ux-foundation.org>,
"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
"npiggin@...e.de" <npiggin@...e.de>,
"riel@...hat.com" <riel@...hat.com>, linux-mm@...ck.org,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vmscan: ZVC updates in shrink_active_list() can be done
once
Reviewed-by: Minchan Kim <minchan.kim@...il.com>
This fine-grained ZVC update in shrink_active_list was made for
determination problem of the dirty
ratio(c878538598d1e7ab41ecc0de8894e34e2fdef630).
The 32 page reclaim time in normal reclaim situation is too short to
change current VM behavior.
So I think this make sense to me.
On Tue, May 5, 2009 at 8:44 AM, Wu Fengguang <fengguang.wu@...el.com> wrote:
> This effectively lifts the unit of nr_inactive_* and pgdeactivate updates
> from PAGEVEC_SIZE=14 to SWAP_CLUSTER_MAX=32.
>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> ---
> mm/vmscan.c | 11 +++--------
> 1 file changed, 3 insertions(+), 8 deletions(-)
>
> --- linux.orig/mm/vmscan.c
> +++ linux/mm/vmscan.c
> @@ -1228,7 +1228,6 @@ static void shrink_active_list(unsigned
> struct scan_control *sc, int priority, int file)
> {
> unsigned long pgmoved;
> - int pgdeactivate = 0;
> unsigned long pgscanned;
> LIST_HEAD(l_hold); /* The pages which were snipped off */
> LIST_HEAD(l_inactive);
> @@ -1257,7 +1256,7 @@ static void shrink_active_list(unsigned
> __mod_zone_page_state(zone, NR_ACTIVE_ANON, -pgmoved);
> spin_unlock_irq(&zone->lru_lock);
>
> - pgmoved = 0;
> + pgmoved = 0; /* count referenced (mapping) mapped pages */
> while (!list_empty(&l_hold)) {
> cond_resched();
> page = lru_to_page(&l_hold);
> @@ -1291,7 +1290,7 @@ static void shrink_active_list(unsigned
> */
> reclaim_stat->recent_rotated[!!file] += pgmoved;
>
> - pgmoved = 0;
> + pgmoved = 0; /* count pages moved to inactive list */
> while (!list_empty(&l_inactive)) {
> page = lru_to_page(&l_inactive);
> prefetchw_prev_lru_page(page, &l_inactive, flags);
> @@ -1304,10 +1303,7 @@ static void shrink_active_list(unsigned
> mem_cgroup_add_lru_list(page, lru);
> pgmoved++;
> if (!pagevec_add(&pvec, page)) {
> - __mod_zone_page_state(zone, NR_LRU_BASE + lru, pgmoved);
> spin_unlock_irq(&zone->lru_lock);
> - pgdeactivate += pgmoved;
> - pgmoved = 0;
> if (buffer_heads_over_limit)
> pagevec_strip(&pvec);
> __pagevec_release(&pvec);
> @@ -1315,9 +1311,8 @@ static void shrink_active_list(unsigned
> }
> }
> __mod_zone_page_state(zone, NR_LRU_BASE + lru, pgmoved);
> - pgdeactivate += pgmoved;
> __count_zone_vm_events(PGREFILL, zone, pgscanned);
> - __count_vm_events(PGDEACTIVATE, pgdeactivate);
> + __count_vm_events(PGDEACTIVATE, pgmoved);
> spin_unlock_irq(&zone->lru_lock);
> if (buffer_heads_over_limit)
> pagevec_strip(&pvec);
>
> --
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> see: http://www.linux-mm.org/ .
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>
--
Thanks,
Minchan Kim
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