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Subject[PATCH 5/5] memcg: generic file accounting update function
No changes from v4.
==
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.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
include/linux/memcontrol.h | 24 ++++++++++++++++++++++
include/linux/page_cgroup.h | 19 ++++++++++++------
mm/memcontrol.c | 46 ++++++++++++++++++--------------------------
3 files changed, 56 insertions(+), 33 deletions(-)
Index: mmotm-0811/include/linux/memcontrol.h
===================================================================
--- mmotm-0811.orig/include/linux/memcontrol.h
+++ mmotm-0811/include/linux/memcontrol.h
@@ -25,6 +25,30 @@ 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 */
+ /* When you add new member for file-stat, please update page_cgroup.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)
+#define NR_FILE_FLAGS_MEMCG ((MEM_CGROUP_FSTAT_END - 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-0811/mm/memcontrol.c
===================================================================
--- mmotm-0811.orig/mm/memcontrol.c
+++ mmotm-0811/mm/memcontrol.c
@@ -76,24 +76,6 @@ 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];
@@ -1545,7 +1527,8 @@ 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;
@@ -1569,11 +1552,11 @@ 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);
} else {
- this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
- ClearPageCgroupFileMapped(pc);
+ this_cpu_dec(mem->stat->count[idx]);
+ clear_bit(fflag_idx(MEMCG_FSTAT_IDX(idx)), &pc->flags);
}
done:
if (need_lock)
@@ -1581,6 +1564,12 @@ done:
rcu_read_unlock();
}

+void mem_cgroup_update_file_mapped(struct page *page, int val)
+{
+ return mem_cgroup_update_file_stat(page,
+ MEM_CGROUP_FSTAT_FILE_MAPPED, val);
+}
+
/*
* size of first charge trial. "32" comes from vmscan.c's magic value.
* TODO: maybe necessary to use big numbers in big irons.
@@ -2040,17 +2029,20 @@ static void __mem_cgroup_commit_charge(s
static void __mem_cgroup_move_account(struct page_cgroup *pc,
struct mem_cgroup *from, struct mem_cgroup *to, bool uncharge)
{
+ int i;
VM_BUG_ON(from == to);
VM_BUG_ON(PageLRU(pc->page));
VM_BUG_ON(!PageCgroupLocked(pc));
VM_BUG_ON(!PageCgroupUsed(pc));
VM_BUG_ON(id_to_memcg(pc->mem_cgroup, true) != from);

- if (PageCgroupFileMapped(pc)) {
+ for (i = MEM_CGROUP_FSTAT_BASE; i < MEM_CGROUP_FSTAT_END; ++i) {
+ if (!test_bit(fflag_idx(MEMCG_FSTAT_IDX(i)), &pc->flags))
+ continue;
/* Update mapped_file data for mem_cgroup */
preempt_disable();
- __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
- __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
+ __this_cpu_dec(from->stat->count[i]);
+ __this_cpu_inc(to->stat->count[i]);
preempt_enable();
}
mem_cgroup_charge_statistics(from, pc, false);
@@ -3479,7 +3471,7 @@ static int mem_cgroup_get_local_stat(str
s->stat[MCS_CACHE] += val * PAGE_SIZE;
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_RSS);
s->stat[MCS_RSS] += val * PAGE_SIZE;
- val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_FILE_MAPPED);
+ val = mem_cgroup_read_stat(mem, MEM_CGROUP_FSTAT_FILE_MAPPED);
s->stat[MCS_FILE_MAPPED] += val * PAGE_SIZE;
val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGIN_COUNT);
s->stat[MCS_PGPGIN] += val;
Index: mmotm-0811/include/linux/page_cgroup.h
===================================================================
--- mmotm-0811.orig/include/linux/page_cgroup.h
+++ mmotm-0811/include/linux/page_cgroup.h
@@ -3,6 +3,7 @@

#ifdef CONFIG_CGROUP_MEM_RES_CTLR
#include <linux/bit_spinlock.h>
+#include <linux/memcontrol.h> /* for flags */
/*
* Page Cgroup can be considered as an extended mem_map.
* A page_cgroup page is associated with every page descriptor. The
@@ -43,10 +44,22 @@ enum {
PCG_CACHE, /* charged as cache */
PCG_USED, /* this object is in use. */
PCG_ACCT_LRU, /* page has been accounted for */
- PCG_FILE_MAPPED, /* page is accounted as "mapped" */
PCG_MIGRATION, /* under page migration */
+ PCG_FILE_FLAGS_MEMCG, /* see memcontrol.h */
+ PCG_FILE_FLAGS_MEMCG_END
+ = PCG_FILE_FLAGS_MEMCG + NR_FILE_FLAGS_MEMCG - 1,
};

+/*
+ * file-stat flags are defined regarding to memcg's stat information.
+ * Here, just defines a macro for indexing
+ */
+static inline int fflag_idx(int idx)
+{
+ VM_BUG_ON((idx) >= NR_FILE_FLAGS_MEMCG);
+ return (idx) + PCG_FILE_FLAGS_MEMCG;
+}
+
#define TESTPCGFLAG(uname, lname) \
static inline int PageCgroup##uname(struct page_cgroup *pc) \
{ return test_bit(PCG_##lname, &pc->flags); }
@@ -79,11 +92,6 @@ CLEARPCGFLAG(AcctLRU, ACCT_LRU)
TESTPCGFLAG(AcctLRU, ACCT_LRU)
TESTCLEARPCGFLAG(AcctLRU, ACCT_LRU)

-
-SETPCGFLAG(FileMapped, FILE_MAPPED)
-CLEARPCGFLAG(FileMapped, FILE_MAPPED)
-TESTPCGFLAG(FileMapped, FILE_MAPPED)
-
SETPCGFLAG(Migration, MIGRATION)
CLEARPCGFLAG(Migration, MIGRATION)
TESTPCGFLAG(Migration, MIGRATION)


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