linux-kernel - Re: [PATCH 3/6] memcg: make throttle_vm

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Date:	Tue, 16 Nov 2010 12:57:26 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Greg Thelen <gthelen@...gle.com>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Minchan Kim <minchan.kim@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] memcg: make throttle_vm_writeout() memcg aware

On Fri, 12 Nov 2010 12:39:35 -0800
Greg Thelen <gthelen@...gle.com> wrote:

> > Odd branch ordering, but I may be OCDing again.
> >
> > 	if (mem_cgroup && memcg_dirty_info())
> > 		do_mem_cgroup_stuff()
> > 	else
> > 		do_global_stuff()
> >
> > would be more natural, IMO.
> 
> I agree.  I will resubmit this series with your improved branch ordering.
> 

Hmm. I think this patch is troublesome.

This patch will make memcg's pageout routine _not_ throttoled even when the whole
system vmscan's pageout is throttoled.

So, one idea is....

Make this change 
==
+++ b/mm/vmscan.c
@@ -1844,7 +1844,7 @@ static void shrink_zone(int priority, struct zone *zone,
 	if (inactive_anon_is_low(zone, sc))
 		shrink_active_list(SWAP_CLUSTER_MAX, zone, sc, priority, 0);
 
-	throttle_vm_writeout(sc->gfp_mask);
+	throttle_vm_writeout(sc->gfp_mask, sc->mem_cgroup);
 }
==
as

==
	
if (!sc->mem_cgroup || throttle_vm_writeout(sc->gfp_mask, sc->mem_cgroup) == not throttled)
	throttole_vm_writeout(sc->gfp_mask, NULL);

Then, both of memcg and global dirty thresh will be checked.


-Kame

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