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SubjectRe: [PATCH 3/7] memcg: nid and zid can be calculated from zone
On Fri, Jul 16, 2010 at 07:15:05PM +0900, KOSAKI Motohiro wrote:
>
> mem_cgroup_soft_limit_reclaim() has zone, nid and zid argument. but nid
> and zid can be calculated from zone. So remove it.
>
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
> ---
> include/linux/memcontrol.h | 6 +++---
> include/linux/mmzone.h | 5 +++++
> mm/memcontrol.c | 5 ++---
> mm/vmscan.c | 7 ++-----
> 4 files changed, 12 insertions(+), 11 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 9411d32..9dec218 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -128,8 +128,8 @@ static inline bool mem_cgroup_disabled(void)
>
> void mem_cgroup_update_file_mapped(struct page *page, int val);
> unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
> - gfp_t gfp_mask, int nid,
> - int zid);
> + gfp_t gfp_mask);
> +
> #else /* CONFIG_CGROUP_MEM_RES_CTLR */
> struct mem_cgroup;
>
> @@ -304,7 +304,7 @@ static inline void mem_cgroup_update_file_mapped(struct page *page,
>
> static inline
> unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
> - gfp_t gfp_mask, int nid, int zid)
> + gfp_t gfp_mask)
> {
> return 0;
> }
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 9ed9c45..34ac27a 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -684,6 +684,11 @@ unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long);
> */
> #define zone_idx(zone) ((zone) - (zone)->zone_pgdat->node_zones)
>
> +static inline int zone_nid(struct zone *zone)
> +{
> + return zone->zone_pgdat->node_id;
> +}
> +

hmm, adding a helper and not converting the existing users of
zone->zone_pgdat may be a little confusing particularly as both types of
usage would exist in the same file e.g. in mem_cgroup_zone_nr_pages.

> static inline int populated_zone(struct zone *zone)
> {
> return (!!zone->present_pages);
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 01f38ff..81bc9bf 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2833,8 +2833,7 @@ static int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg,
> }
>
> unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
> - gfp_t gfp_mask, int nid,
> - int zid)
> + gfp_t gfp_mask)
> {
> unsigned long nr_reclaimed = 0;
> struct mem_cgroup_per_zone *mz, *next_mz = NULL;
> @@ -2846,7 +2845,7 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
> if (order > 0)
> return 0;
>
> - mctz = soft_limit_tree_node_zone(nid, zid);
> + mctz = soft_limit_tree_node_zone(zone_nid(zone), zone_idx(zone));
> /*
> * This loop can run a while, specially if mem_cgroup's continuously
> * keep exceeding their soft limit and putting the system under
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index be860a0..89b4287 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -2121,7 +2121,6 @@ loop_again:
> for (i = 0; i <= end_zone; i++) {
> struct zone *zone = pgdat->node_zones + i;
> int nr_slab;
> - int nid, zid;
>
> if (!populated_zone(zone))
> continue;
> @@ -2133,14 +2132,12 @@ loop_again:
> sc.nr_scanned = 0;
> note_zone_scanning_priority(zone, priority);
>
> - nid = pgdat->node_id;
> - zid = zone_idx(zone);
> /*
> * Call soft limit reclaim before calling shrink_zone.
> * For now we ignore the return value
> */
> - mem_cgroup_soft_limit_reclaim(zone, order, sc.gfp_mask,
> - nid, zid);
> + mem_cgroup_soft_limit_reclaim(zone, order, sc.gfp_mask);
> +

Other than the usual comment of it belonging in its own series

Acked-by: Mel Gorman <mel@csn.ul.ie>

> /*
> * We put equal pressure on every zone, unless one
> * zone has way too many pages free already.
> --
> 1.6.5.2
>
>
>

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


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