On Mon, 25 Apr 2011 10:35:39 -0700
Ying Han <yinghan@xxxxxxxxxx> wrote:
> On Mon, Apr 25, 2011 at 2:34 AM, KAMEZAWA Hiroyuki <
> kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
>
> >
> > At memcg memory reclaim, get_scan_count() may returns [0, 0, 0, 0]
> > and no scan was not issued at the reclaim priority.
> >
> > The reason is because memory cgroup may not be enough big to have
> > the number of pages, which is greater than 1 << priority.
> >
> > Because priority affects many routines in vmscan.c, it's better
> > to scan memory even if usage >> priority < 0.
> > From another point of view, if memcg's zone doesn't have enough memory
> > which
> > meets priority, it should be skipped. So, this patch creates a temporal
> > priority
> > in get_scan_count() and scan some amount of pages even when
> > usage is small. By this, memcg's reclaim goes smoother without
> > having too high priority, which will cause unnecessary congestion_wait(),
> > etc.
> >
> > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> > ---
> > include/linux/memcontrol.h | 6 ++++++
> > mm/memcontrol.c | 5 +++++
> > mm/vmscan.c | 11 +++++++++++
> > 3 files changed, 22 insertions(+)
> >
> > Index: memcg/include/linux/memcontrol.h
> > ===================================================================
> > --- memcg.orig/include/linux/memcontrol.h
> > +++ memcg/include/linux/memcontrol.h
> > @@ -152,6 +152,7 @@ unsigned long mem_cgroup_soft_limit_recl
> > gfp_t gfp_mask,
> > unsigned long
> > *total_scanned);
> > u64 mem_cgroup_get_limit(struct mem_cgroup *mem);
> > +u64 mem_cgroup_get_usage(struct mem_cgroup *mem);
> >
> > void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item
> > idx);
> > #ifdef CONFIG_TRANSPARENT_HUGEPAGE
> > @@ -357,6 +358,11 @@ u64 mem_cgroup_get_limit(struct mem_cgro
> > return 0;
> > }
> >
> > +static inline u64 mem_cgroup_get_limit(struct mem_cgroup *mem)
> > +{
> > + return 0;
> > +}
> > +
> >
>
> should be mem_cgroup_get_usage()
>
Ah, yes. thanks.
-Kame
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