linux-kernel - Re: Interactivity regression since v3.11 in mm/vmscan.c

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Message-ID: <CAMP44s366jWnpyz1+th9+ndrD8XbPgEgOokQPYpBKS=suzeUdA@mail.gmail.com>
Date:	Sat, 7 Jun 2014 10:23:50 -0500
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	zhdxzx@...a.com
Cc:	Michal Hocko <mhocko@...e.cz>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, dhillf <dhillf@...il.com>,
	"hillf.zj" <hillf.zj@...baba-inc.com>
Subject: Re: Interactivity regression since v3.11 in mm/vmscan.c

On Sat, Jun 7, 2014 at 7:35 AM,  <zhdxzx@...a.com> wrote:

> Would you please try again based only on comment [1](based on v3.15-rc8)?
> thanks
> Hillf
>
> --- a/mm/vmscan.c       Sat Jun  7 18:38:08 2014
> +++ b/mm/vmscan.c       Sat Jun  7 20:08:36 2014
> @@ -1566,7 +1566,7 @@ shrink_inactive_list(unsigned long nr_to
>                  * implies that pages are cycling through the LRU faster than
>                  * they are written so also forcibly stall.
>                  */
> -               if (nr_unqueued_dirty == nr_taken || nr_immediate)
> +               if (nr_immediate)
>                         congestion_wait(BLK_RW_ASYNC, HZ/10);
>         }

That actually seems to work correctly on v3.15-rc8.

-- 
Felipe Contreras
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