linux-kernel - Re: [PATCH] [RT] avoid preemption in memory controller code

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Date:	Tue, 9 Dec 2008 10:32:31 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Tim Blechmann <tim@...ngt.org>, rostedt@...dmis.org,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [PATCH] [RT] avoid preemption in memory controller code

On Tue, 09 Dec 2008 09:13:12 +0800
Li Zefan <lizf@...fujitsu.com> wrote:

> CC: Balbir Singh <balbir@...ux.vnet.ibm.com>
> CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> Tim Blechmann wrote:
> > the lru_lock of struct mem_group_per_zone is used to avoid preemption
> > during the __mem_cgroup_stat_add_safe function.
> > therefore, a raw_spinlock_t should be used.
> > 
> 
> FYI, this lru_lock no longer exists in -mm tree. The following patch
> removes that lock:
> 
> 	http://marc.info/?l=linux-mm&m=122665814801979&w=2
> 
> > Signed-off-by: Tim Blechmann <tim@...ngt.org>
> > ---
> >  mm/memcontrol.c |    4 ++--
> >  1 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> > index 517f945..8661732 100644
> > --- a/mm/memcontrol.c
> > +++ b/mm/memcontrol.c
> > @@ -95,9 +95,9 @@ enum mem_cgroup_zstat_index {
> >  
> >  struct mem_cgroup_per_zone {
> >  	/*
> > -	 * spin_lock to protect the per cgroup LRU
> > +	 * raw_spin_lock to protect the per cgroup LRU
> >  	 */
> > -	spinlock_t		lru_lock;
> > +	raw_spinlock_t		lru_lock;
> >  	struct list_head	active_list;
> >  	struct list_head	inactive_list;
> >  	unsigned long count[NR_MEM_CGROUP_ZSTAT];

yes..I remvoed that. Please see mmotm and subscribe linux-mm, 
if you have interests  memory resource controller.

Anyway, thanks.

-Kame

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