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authorJohannes Weiner <hannes@cmpxchg.org>2017-05-03 14:55:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 15:52:11 -0700
commitdf0e53d0619e83b465e363c088bf4eeb2848273b (patch)
tree5e5d55be503881f94f90f2fbdc039556668b4991 /include/linux/memcontrol.h
parent31176c781508e4e35b1cc4ae2f0a5abd1f4ea689 (diff)
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mm: memcontrol: re-use global VM event enum
The current duplication is a high-maintenance mess, and it's painful to add new items. This increases the size of the event array, but we'll eventually want most of the VM events tracked on a per-cgroup basis anyway. Link: http://lkml.kernel.org/r/20170404220148.28338-2-hannes@cmpxchg.org Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/memcontrol.h')
-rw-r--r--include/linux/memcontrol.h45
1 files changed, 14 insertions, 31 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index bc0c16e284c0..0bb5f055bd26 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -69,20 +69,6 @@ struct mem_cgroup_reclaim_cookie {
unsigned int generation;
};
-enum mem_cgroup_events_index {
- MEM_CGROUP_EVENTS_PGPGIN, /* # of pages paged in */
- MEM_CGROUP_EVENTS_PGPGOUT, /* # of pages paged out */
- MEM_CGROUP_EVENTS_PGFAULT, /* # of page-faults */
- MEM_CGROUP_EVENTS_PGMAJFAULT, /* # of major page-faults */
- MEM_CGROUP_EVENTS_NSTATS,
- /* default hierarchy events */
- MEMCG_LOW = MEM_CGROUP_EVENTS_NSTATS,
- MEMCG_HIGH,
- MEMCG_MAX,
- MEMCG_OOM,
- MEMCG_NR_EVENTS,
-};
-
/*
* Per memcg event counter is incremented at every pagein/pageout. With THP,
* it will be incremated by the number of pages. This counter is used for
@@ -106,6 +92,15 @@ struct mem_cgroup_id {
atomic_t ref;
};
+/* Cgroup-specific events, on top of universal VM events */
+enum memcg_event_item {
+ MEMCG_LOW = NR_VM_EVENT_ITEMS,
+ MEMCG_HIGH,
+ MEMCG_MAX,
+ MEMCG_OOM,
+ MEMCG_NR_EVENTS,
+};
+
struct mem_cgroup_stat_cpu {
long count[MEMCG_NR_STAT];
unsigned long events[MEMCG_NR_EVENTS];
@@ -288,9 +283,9 @@ static inline bool mem_cgroup_disabled(void)
}
static inline void mem_cgroup_event(struct mem_cgroup *memcg,
- enum mem_cgroup_events_index idx)
+ enum memcg_event_item event)
{
- this_cpu_inc(memcg->stat->events[idx]);
+ this_cpu_inc(memcg->stat->events[event]);
cgroup_file_notify(&memcg->events_file);
}
@@ -575,20 +570,8 @@ static inline void mem_cgroup_count_vm_event(struct mm_struct *mm,
rcu_read_lock();
memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
- if (unlikely(!memcg))
- goto out;
-
- switch (idx) {
- case PGFAULT:
- this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGFAULT]);
- break;
- case PGMAJFAULT:
- this_cpu_inc(memcg->stat->events[MEM_CGROUP_EVENTS_PGMAJFAULT]);
- break;
- default:
- BUG();
- }
-out:
+ if (likely(memcg))
+ this_cpu_inc(memcg->stat->events[idx]);
rcu_read_unlock();
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
@@ -608,7 +591,7 @@ static inline bool mem_cgroup_disabled(void)
}
static inline void mem_cgroup_event(struct mem_cgroup *memcg,
- enum mem_cgroup_events_index idx)
+ enum memcg_event_item event)
{
}