linux-kernel - Re: [PATCH 7/7] memcg: add mm_vmscan_memcg

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Date:	Fri, 16 Jul 2010 14:18:52 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Nishimura Daisuke <d-nishimura@....biglobe.ne.jp>
Subject: Re: [PATCH 7/7] memcg: add mm_vmscan_memcg_isolate tracepoint

On Fri, Jul 16, 2010 at 12:21:09PM +0100, Mel Gorman wrote:
> On Fri, Jul 16, 2010 at 07:18:18PM +0900, KOSAKI Motohiro wrote:
> > 
> > Memcg also need to trace page isolation information as global reclaim.
> > This patch does it.
> > 
> > Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> > ---
> >  include/trace/events/vmscan.h |   15 +++++++++++++++
> >  mm/memcontrol.c               |    7 +++++++
> >  2 files changed, 22 insertions(+), 0 deletions(-)
> > 
> > diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
> > index e37fe72..eefd399 100644
> > --- a/include/trace/events/vmscan.h
> > +++ b/include/trace/events/vmscan.h
> > @@ -213,6 +213,21 @@ DEFINE_EVENT(mm_vmscan_lru_isolate_template, mm_vmscan_lru_isolate,
> >  
> >  );
> >  
> > +DEFINE_EVENT(mm_vmscan_lru_isolate_template, mm_vmscan_memcg_isolate,
> > +
> > +	TP_PROTO(int order,
> > +		unsigned long nr_requested,
> 
> I just spotted that this is badly named by myself. It should have been
> order.
> 

I meant it should have been nr_to_scan (not order) because it's easier to
translate between what is happening in the source when reading the tracepoints.

> > +		unsigned long nr_scanned,
> > +		unsigned long nr_taken,
> > +		unsigned long nr_lumpy_taken,
> > +		unsigned long nr_lumpy_dirty,
> > +		unsigned long nr_lumpy_failed,
> > +		int isolate_mode),
> > +
> > +	TP_ARGS(order, nr_requested, nr_scanned, nr_taken, nr_lumpy_taken, nr_lumpy_dirty, nr_lumpy_failed, isolate_mode)
> > +
> > +);
> > +
> >  TRACE_EVENT(mm_vmscan_writepage,
> >  
> >  	TP_PROTO(struct page *page,
> > diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> > index 81bc9bf..82e191f 100644
> > --- a/mm/memcontrol.c
> > +++ b/mm/memcontrol.c
> > @@ -52,6 +52,9 @@
> >  
> >  #include <asm/uaccess.h>
> >  
> > +#include <trace/events/vmscan.h>
> > +
> > +
> 
> Excessive whitespace there.
> 
> Otherwise, I didn't spot any problems.
> 
> >  struct cgroup_subsys mem_cgroup_subsys __read_mostly;
> >  #define MEM_CGROUP_RECLAIM_RETRIES	5
> >  struct mem_cgroup *root_mem_cgroup __read_mostly;
> > @@ -1042,6 +1045,10 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
> >  	}
> >  
> >  	*scanned = scan;
> > +
> > +	trace_mm_vmscan_memcg_isolate(0, nr_to_scan, scan, nr_taken,
> > +				      0, 0, 0, mode);
> > +
> >  	return nr_taken;
> >  }

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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