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Date: Fri, 2 Jan 2015 15:58:47 -0500
From: Johannes Weiner <hannes@...xchg.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Michal Hocko <mhocko@...e.cz>,
Vladimir Davydov <vdavydov@...allels.com>, linux-mm@...ck.org,
cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [patch] mm: memcontrol: track move_lock state internally
The complexity of memcg page stat synchronization is currently leaking
into the callsites, forcing them to keep track of the move_lock state
and the IRQ flags. Simplify the API by tracking it in the memcg.
Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
include/linux/memcontrol.h | 6 ++--
mm/memcontrol.c | 68 ++++++++++++++++++++++++++--------------------
mm/page-writeback.c | 12 +++-----
mm/rmap.c | 12 +++-----
4 files changed, 49 insertions(+), 49 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index fb212e1d700d..04d3c2028782 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -138,12 +138,10 @@ static inline bool mem_cgroup_disabled(void)
return false;
}
-struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page, bool *locked,
- unsigned long *flags);
-void mem_cgroup_end_page_stat(struct mem_cgroup *memcg, bool *locked,
- unsigned long *flags);
+struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page);
void mem_cgroup_update_page_stat(struct mem_cgroup *memcg,
enum mem_cgroup_stat_index idx, int val);
+void mem_cgroup_end_page_stat(struct mem_cgroup *memcg);
static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg,
enum mem_cgroup_stat_index idx)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a855848627a5..eccc0ed3b6f3 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -325,9 +325,11 @@ struct mem_cgroup {
/*
* set > 0 if pages under this cgroup are moving to other cgroup.
*/
- atomic_t moving_account;
+ atomic_t moving_account;
/* taken only while moving_account > 0 */
- spinlock_t move_lock;
+ spinlock_t move_lock;
+ struct task_struct *move_lock_task;
+ unsigned long move_lock_flags;
/*
* percpu counter.
*/
@@ -1977,34 +1979,33 @@ cleanup:
/**
* mem_cgroup_begin_page_stat - begin a page state statistics transaction
* @page: page that is going to change accounted state
- * @locked: &memcg->move_lock slowpath was taken
- * @flags: IRQ-state flags for &memcg->move_lock
*
* This function must mark the beginning of an accounted page state
* change to prevent double accounting when the page is concurrently
* being moved to another memcg:
*
- * memcg = mem_cgroup_begin_page_stat(page, &locked, &flags);
+ * memcg = mem_cgroup_begin_page_stat(page);
* if (TestClearPageState(page))
* mem_cgroup_update_page_stat(memcg, state, -1);
- * mem_cgroup_end_page_stat(memcg, locked, flags);
- *
- * The RCU lock is held throughout the transaction. The fast path can
- * get away without acquiring the memcg->move_lock (@locked is false)
- * because page moving starts with an RCU grace period.
- *
- * The RCU lock also protects the memcg from being freed when the page
- * state that is going to change is the only thing preventing the page
- * from being uncharged. E.g. end-writeback clearing PageWriteback(),
- * which allows migration to go ahead and uncharge the page before the
- * account transaction might be complete.
+ * mem_cgroup_end_page_stat(memcg);
*/
-struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page,
- bool *locked,
- unsigned long *flags)
+struct mem_cgroup *mem_cgroup_begin_page_stat(struct page *page)
{
struct mem_cgroup *memcg;
+ unsigned long flags;
+ /*
+ * The RCU lock is held throughout the transaction. The fast
+ * path can get away without acquiring the memcg->move_lock
+ * because page moving starts with an RCU grace period.
+ *
+ * The RCU lock also protects the memcg from being freed when
+ * the page state that is going to change is the only thing
+ * preventing the page from being uncharged.
+ * E.g. end-writeback clearing PageWriteback(), which allows
+ * migration to go ahead and uncharge the page before the
+ * account transaction might be complete.
+ */
rcu_read_lock();
if (mem_cgroup_disabled())
@@ -2014,16 +2015,22 @@ again:
if (unlikely(!memcg))
return NULL;
- *locked = false;
if (atomic_read(&memcg->moving_account) <= 0)
return memcg;
- spin_lock_irqsave(&memcg->move_lock, *flags);
+ spin_lock_irqsave(&memcg->move_lock, flags);
if (memcg != page->mem_cgroup) {
- spin_unlock_irqrestore(&memcg->move_lock, *flags);
+ spin_unlock_irqrestore(&memcg->move_lock, flags);
goto again;
}
- *locked = true;
+
+ /*
+ * When charge migration first begins, we can have locked and
+ * unlocked page stat updates happening concurrently. Track
+ * the task who has the lock for mem_cgroup_end_page_stat().
+ */
+ memcg->move_lock_task = current;
+ memcg->move_lock_flags = flags;
return memcg;
}
@@ -2031,14 +2038,17 @@ again:
/**
* mem_cgroup_end_page_stat - finish a page state statistics transaction
* @memcg: the memcg that was accounted against
- * @locked: value received from mem_cgroup_begin_page_stat()
- * @flags: value received from mem_cgroup_begin_page_stat()
*/
-void mem_cgroup_end_page_stat(struct mem_cgroup *memcg, bool *locked,
- unsigned long *flags)
+void mem_cgroup_end_page_stat(struct mem_cgroup *memcg)
{
- if (memcg && *locked)
- spin_unlock_irqrestore(&memcg->move_lock, *flags);
+ if (memcg && memcg->move_lock_task == current) {
+ unsigned long flags = memcg->move_lock_flags;
+
+ memcg->move_lock_task = NULL;
+ memcg->move_lock_flags = 0;
+
+ spin_unlock_irqrestore(&memcg->move_lock, flags);
+ }
rcu_read_unlock();
}
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 6f4335238e33..fb71e9deca85 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2308,12 +2308,10 @@ EXPORT_SYMBOL(clear_page_dirty_for_io);
int test_clear_page_writeback(struct page *page)
{
struct address_space *mapping = page_mapping(page);
- unsigned long memcg_flags;
struct mem_cgroup *memcg;
- bool locked;
int ret;
- memcg = mem_cgroup_begin_page_stat(page, &locked, &memcg_flags);
+ memcg = mem_cgroup_begin_page_stat(page);
if (mapping) {
struct backing_dev_info *bdi = mapping->backing_dev_info;
unsigned long flags;
@@ -2338,19 +2336,17 @@ int test_clear_page_writeback(struct page *page)
dec_zone_page_state(page, NR_WRITEBACK);
inc_zone_page_state(page, NR_WRITTEN);
}
- mem_cgroup_end_page_stat(memcg, &locked, &memcg_flags);
+ mem_cgroup_end_page_stat(memcg);
return ret;
}
int __test_set_page_writeback(struct page *page, bool keep_write)
{
struct address_space *mapping = page_mapping(page);
- unsigned long memcg_flags;
struct mem_cgroup *memcg;
- bool locked;
int ret;
- memcg = mem_cgroup_begin_page_stat(page, &locked, &memcg_flags);
+ memcg = mem_cgroup_begin_page_stat(page);
if (mapping) {
struct backing_dev_info *bdi = mapping->backing_dev_info;
unsigned long flags;
@@ -2380,7 +2376,7 @@ int __test_set_page_writeback(struct page *page, bool keep_write)
mem_cgroup_inc_page_stat(memcg, MEM_CGROUP_STAT_WRITEBACK);
inc_zone_page_state(page, NR_WRITEBACK);
}
- mem_cgroup_end_page_stat(memcg, &locked, &memcg_flags);
+ mem_cgroup_end_page_stat(memcg);
return ret;
}
diff --git a/mm/rmap.c b/mm/rmap.c
index c325f8bd2cc4..5e995a9da902 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1112,24 +1112,20 @@ void page_add_new_anon_rmap(struct page *page,
void page_add_file_rmap(struct page *page)
{
struct mem_cgroup *memcg;
- unsigned long flags;
- bool locked;
- memcg = mem_cgroup_begin_page_stat(page, &locked, &flags);
+ memcg = mem_cgroup_begin_page_stat(page);
if (atomic_inc_and_test(&page->_mapcount)) {
__inc_zone_page_state(page, NR_FILE_MAPPED);
mem_cgroup_inc_page_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED);
}
- mem_cgroup_end_page_stat(memcg, &locked, &flags);
+ mem_cgroup_end_page_stat(memcg);
}
static void page_remove_file_rmap(struct page *page)
{
struct mem_cgroup *memcg;
- unsigned long flags;
- bool locked;
- memcg = mem_cgroup_begin_page_stat(page, &locked, &flags);
+ memcg = mem_cgroup_begin_page_stat(page);
/* page still mapped by someone else? */
if (!atomic_add_negative(-1, &page->_mapcount))
@@ -1150,7 +1146,7 @@ static void page_remove_file_rmap(struct page *page)
if (unlikely(PageMlocked(page)))
clear_page_mlock(page);
out:
- mem_cgroup_end_page_stat(memcg, &locked, &flags);
+ mem_cgroup_end_page_stat(memcg);
}
/**
--
2.2.0
--
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