[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20130321165600.GV6094@dhcp22.suse.cz>
Date: Thu, 21 Mar 2013 17:58:37 +0100
From: Michal Hocko <mhocko@...e.cz>
To: Mel Gorman <mgorman@...e.de>
Cc: Linux-MM <linux-mm@...ck.org>, Jiri Slaby <jslaby@...e.cz>,
Valdis Kletnieks <Valdis.Kletnieks@...edu>,
Rik van Riel <riel@...hat.com>,
Zlatko Calusic <zcalusic@...sync.net>,
Johannes Weiner <hannes@...xchg.org>,
dormando <dormando@...ia.net>,
Satoru Moriya <satoru.moriya@....com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/10] mm: vmscan: Check if kswapd should writepage once
per priority
On Sun 17-03-13 13:04:15, Mel Gorman wrote:
> Currently kswapd checks if it should start writepage as it shrinks
> each zone without taking into consideration if the zone is balanced or
> not. This is not wrong as such but it does not make much sense either.
> This patch checks once per priority if kswapd should be writing pages.
Except it is not once per priority strictly speaking... It doesn't make
any difference though.
> Signed-off-by: Mel Gorman <mgorman@...e.de>
Reviewed-by: Michal Hocko <mhocko@...e.cz>
> ---
> mm/vmscan.c | 14 +++++++-------
> 1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 84375b2..8c66e5a 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2804,6 +2804,13 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
> }
>
> /*
> + * If we're getting trouble reclaiming, start doing writepage
> + * even in laptop mode.
> + */
> + if (sc.priority < DEF_PRIORITY - 2)
> + sc.may_writepage = 1;
> +
> + /*
> * Now scan the zone in the dma->highmem direction, stopping
> * at the last zone which needs scanning.
> *
> @@ -2876,13 +2883,6 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
> nr_to_reclaim += sc.nr_to_reclaim;
> }
>
> - /*
> - * If we're getting trouble reclaiming, start doing
> - * writepage even in laptop mode.
> - */
> - if (sc.priority < DEF_PRIORITY - 2)
> - sc.may_writepage = 1;
> -
> if (zone->all_unreclaimable) {
> if (end_zone && end_zone == i)
> end_zone--;
> --
> 1.8.1.4
>
--
Michal Hocko
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists