From: Mel Gorman <mel@csn.ul.ie>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Simon Kirby <sim@hostway.ca>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Shaohua Li <shaohua.li@intel.com>,
Dave Hansen <dave@linux.vnet.ibm.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 5/6] mm: kswapd: Treat zone->all_unreclaimable in sleeping_prematurely similar to balance_pgdat()
Date: Fri, 10 Dec 2010 10:55:32 +0000 [thread overview]
Message-ID: <20101210105532.GM20133@csn.ul.ie> (raw)
In-Reply-To: <20101210102337.8ff1fad2.kamezawa.hiroyu@jp.fujitsu.com>
On Fri, Dec 10, 2010 at 10:23:37AM +0900, KAMEZAWA Hiroyuki wrote:
> On Thu, 9 Dec 2010 11:18:19 +0000
> Mel Gorman <mel@csn.ul.ie> wrote:
>
> > After DEF_PRIORITY, balance_pgdat() considers all_unreclaimable zones to
> > be balanced but sleeping_prematurely does not. This can force kswapd to
> > stay awake longer than it should. This patch fixes it.
> >
> > Signed-off-by: Mel Gorman <mel@csn.ul.ie>
>
> Hmm, maybe the logic works well but I don't like very much.
>
> How about adding below instead of pgdat->node_present_pages ?
>
> static unsigned long required_balanced_pages(pgdat, classzone_idx)
> {
> unsigned long present = 0;
>
> for_each_zone_in_node(zone, pgdat) {
> if (zone->all_unreclaimable) /* Ignore unreclaimable zone at checking balance */
> continue;
> if (zone_idx(zone) > classzone_idx)
> continue;
> present = zone->present_pages;
> }
> return present;
> }
>
I'm afraid I do not really understand. After your earlier comments,
pgdat_balanced() now looks like
static bool pgdat_balanced(pg_data_t *pgdat, unsigned long balanced_pages,
int classzone_idx)
{
unsigned long present_pages = 0;
int i;
for (i = 0; i <= classzone_idx; i++)
present_pages += pgdat->node_zones[i].present_pages;
return balanced_pages > (present_pages >> 2);
}
so the classzone is being taken into account. I'm not sure what you're
asking for it to be changed to. Maybe it'll be clearer after V4 comes
out rebased on top of mmotm.
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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next prev parent reply other threads:[~2010-12-10 10:55 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-09 11:18 [PATCH 0/5] Prevent kswapd dumping excessive amounts of memory in response to high-order allocations V3 Mel Gorman
2010-12-09 11:18 ` [PATCH 1/6] mm: kswapd: Stop high-order balancing when any suitable zone is balanced Mel Gorman
2010-12-09 15:21 ` Minchan Kim
2010-12-10 1:06 ` KAMEZAWA Hiroyuki
2010-12-13 16:54 ` Eric B Munson
2010-12-09 11:18 ` [PATCH 2/6] mm: kswapd: Keep kswapd awake for high-order allocations until a percentage of the node " Mel Gorman
2010-12-09 15:42 ` Minchan Kim
2010-12-10 10:19 ` Mel Gorman
2010-12-10 1:16 ` KAMEZAWA Hiroyuki
2010-12-10 10:25 ` Mel Gorman
2010-12-13 17:00 ` Eric B Munson
2010-12-09 11:18 ` [PATCH 3/6] mm: kswapd: Use the order that kswapd was reclaiming at for sleeping_prematurely() Mel Gorman
2010-12-10 1:16 ` Minchan Kim
2010-12-10 10:36 ` Mel Gorman
2010-12-10 1:18 ` KAMEZAWA Hiroyuki
2010-12-09 11:18 ` [PATCH 4/6] mm: kswapd: Reset kswapd_max_order and classzone_idx after reading Mel Gorman
2010-12-09 15:59 ` Minchan Kim
2010-12-09 16:03 ` Minchan Kim
2010-12-10 10:42 ` Mel Gorman
2010-12-10 1:19 ` KAMEZAWA Hiroyuki
2010-12-09 11:18 ` [PATCH 5/6] mm: kswapd: Treat zone->all_unreclaimable in sleeping_prematurely similar to balance_pgdat() Mel Gorman
2010-12-10 1:23 ` KAMEZAWA Hiroyuki
2010-12-10 10:55 ` Mel Gorman [this message]
2010-12-12 23:58 ` KAMEZAWA Hiroyuki
2010-12-09 11:18 ` [PATCH 6/6] mm: kswapd: Use the classzone idx that kswapd was using for sleeping_prematurely() Mel Gorman
2010-12-10 2:38 ` Minchan Kim
2010-12-09 11:19 ` [PATCH 0/5] Prevent kswapd dumping excessive amounts of memory in response to high-order allocations V3 Mel Gorman
2010-12-10 15:46 [PATCH 0/6] Prevent kswapd dumping excessive amounts of memory in response to high-order allocations V4 Mel Gorman
2010-12-10 15:46 ` [PATCH 5/6] mm: kswapd: Treat zone->all_unreclaimable in sleeping_prematurely similar to balance_pgdat() Mel Gorman
2010-12-13 19:40 ` Eric B Munson
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