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SubjectRe: [PATCH -mm 4/5] memcg generic file stat accounting interface.
* KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> [2010-08-02 19:17:15]:

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
>
> Preparing for adding new status arounf file caches.(dirty, writeback,etc..)
> Using a unified macro and more generic names.
> All counters will have the same rule for updating.
>
> Changelog:
> - clean up and moved mem_cgroup_stat_index to header file.
>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> ---
> include/linux/memcontrol.h | 23 ++++++++++++++++++++++
> include/linux/page_cgroup.h | 12 +++++------
> mm/memcontrol.c | 46 ++++++++++++++++++--------------------------
> 3 files changed, 48 insertions(+), 33 deletions(-)
>
> Index: mmotm-0727/include/linux/memcontrol.h
> ===================================================================
> --- mmotm-0727.orig/include/linux/memcontrol.h
> +++ mmotm-0727/include/linux/memcontrol.h
> @@ -25,6 +25,29 @@ struct page_cgroup;
> struct page;
> struct mm_struct;
>
> +/*
> + * Per-cpu Statistics for memory cgroup.
> + */
> +enum mem_cgroup_stat_index {
> + /*
> + * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
> + */
> + MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */
> + MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */
> + MEM_CGROUP_STAT_PGPGIN_COUNT, /* # of pages paged in */
> + MEM_CGROUP_STAT_PGPGOUT_COUNT, /* # of pages paged out */
> + MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */
> + MEM_CGROUP_EVENTS, /* incremented at every pagein/pageout */
> + MEM_CGROUP_ON_MOVE, /* A check for locking move account/status */
> + /* About file-stat please see memcontrol.h */

Isn't this memcontrol.h?

> + MEM_CGROUP_FSTAT_BASE,
> + MEM_CGROUP_FSTAT_FILE_MAPPED = MEM_CGROUP_FSTAT_BASE,
> + MEM_CGROUP_FSTAT_END,
> + MEM_CGROUP_STAT_NSTATS = MEM_CGROUP_FSTAT_END,
> +};
> +
> +#define MEMCG_FSTAT_IDX(idx) ((idx) - MEM_CGROUP_FSTAT_BASE)
> +
> extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
> struct list_head *dst,
> unsigned long *scanned, int order,
> Index: mmotm-0727/mm/memcontrol.c
> ===================================================================
> --- mmotm-0727.orig/mm/memcontrol.c
> +++ mmotm-0727/mm/memcontrol.c
> @@ -74,24 +74,6 @@ static int really_do_swap_account __init
> #define THRESHOLDS_EVENTS_THRESH (7) /* once in 128 */
> #define SOFTLIMIT_EVENTS_THRESH (10) /* once in 1024 */
>
> -/*
> - * Statistics for memory cgroup.
> - */
> -enum mem_cgroup_stat_index {
> - /*
> - * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
> - */
> - MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */
> - MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */
> - MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
> - MEM_CGROUP_STAT_PGPGIN_COUNT, /* # of pages paged in */
> - MEM_CGROUP_STAT_PGPGOUT_COUNT, /* # of pages paged out */
> - MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */
> - MEM_CGROUP_EVENTS, /* incremented at every pagein/pageout */
> - MEM_CGROUP_ON_MOVE, /* A check for locking move account/status */
> -
> - MEM_CGROUP_STAT_NSTATS,
> -};
>
> struct mem_cgroup_stat_cpu {
> s64 count[MEM_CGROUP_STAT_NSTATS];
> @@ -1512,7 +1494,8 @@ bool mem_cgroup_handle_oom(struct mem_cg
> * Currently used to update mapped file statistics, but the routine can be
> * generalized to update other statistics as well.
> */
> -void mem_cgroup_update_file_mapped(struct page *page, int val)
> +static void
> +mem_cgroup_update_file_stat(struct page *page, unsigned int idx, int val)
> {
> struct mem_cgroup *mem;
> struct page_cgroup *pc;
> @@ -1536,11 +1519,11 @@ void mem_cgroup_update_file_mapped(struc
> if (unlikely(!PageCgroupUsed(pc)))
> goto done;
> if (val > 0) {
> - this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
> - SetPageCgroupFileMapped(pc);
> + this_cpu_inc(mem->stat->count[idx]);
> + set_bit(fflag_idx(MEMCG_FSTAT_IDX(idx)), &pc->flags);

Do we use the bit in pc->flags, otherwise is there an advantage of
creating a separate index for the other stats the block I/O needs?

--
Three Cheers,
Balbir


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