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SubjectRe: [PATCH 0/6] page cgroup diet v5
On Fri, 17 Feb 2012 18:24:26 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

>
> This patch set is for removing 2 flags PCG_FILE_MAPPED and PCG_MOVE_LOCK on
> page_cgroup->flags. After this, page_cgroup has only 3bits of flags.
> And, this set introduces a new method to update page status accounting per memcg.
> With it, we don't have to add new flags onto page_cgroup if 'struct page' has
> information. This will be good for avoiding a new flag for page_cgroup.
>
> Fixed pointed out parts.
> - added more comments
> - fixed texts
> - removed redundant arguments.
>

I tweaked a few things here. Renamed "bool lock;" to "bool locked" in
several places. Also the void-returning
mem_cgroup_begin_update_page_stat() was doing an explicit return which
is OK C but pointless and misleading.


Also, this has been bugging me for a while ;)

From: Andrew Morton <akpm@linux-foundation.org>
Subject: mm/memcontrol.c: s/stealed/stolen/

A grammatical fix.

Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/memcontrol.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff -puN mm/memcontrol.c~a mm/memcontrol.c
--- a/mm/memcontrol.c~a
+++ a/mm/memcontrol.c
@@ -1299,8 +1299,8 @@ static void mem_cgroup_end_move(struct m
/*
* 2 routines for checking "mem" is under move_account() or not.
*
- * mem_cgroup_stealed() - checking a cgroup is mc.from or not. This is used
- * for avoiding race in accounting. If true,
+ * mem_cgroup_stolen() - checking whether a cgroup is mc.from or not. This
+ * is used for avoiding races in accounting. If true,
* pc->mem_cgroup may be overwritten.
*
* mem_cgroup_under_move() - checking a cgroup is mc.from or mc.to or
@@ -1308,7 +1308,7 @@ static void mem_cgroup_end_move(struct m
* waiting at hith-memory prressure caused by "move".
*/

-static bool mem_cgroup_stealed(struct mem_cgroup *memcg)
+static bool mem_cgroup_stolen(struct mem_cgroup *memcg)
{
VM_BUG_ON(!rcu_read_lock_held());
return atomic_read(&memcg->moving_account) > 0;
@@ -1356,7 +1356,7 @@ static bool mem_cgroup_wait_acct_move(st
* Take this lock when
* - a code tries to modify page's memcg while it's USED.
* - a code tries to modify page state accounting in a memcg.
- * see mem_cgroup_stealed(), too.
+ * see mem_cgroup_stolen(), too.
*/
static void move_lock_mem_cgroup(struct mem_cgroup *memcg,
unsigned long *flags)
@@ -1899,9 +1899,9 @@ again:
* If this memory cgroup is not under account moving, we don't
* need to take move_lock_page_cgroup(). Because we already hold
* rcu_read_lock(), any calls to move_account will be delayed until
- * rcu_read_unlock() if mem_cgroup_stealed() == true.
+ * rcu_read_unlock() if mem_cgroup_stolen() == true.
*/
- if (!mem_cgroup_stealed(memcg))
+ if (!mem_cgroup_stolen(memcg))
return;

move_lock_mem_cgroup(memcg, flags);
_


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