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Subject[PATCH v6 1/7] mm/memcg: scanning_global_lru means mem_cgroup_disabled
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From: Hugh Dickins <hughd@google.com>

Although one has to admire the skill with which it has been concealed,
scanning_global_lru(mz) is actually just an interesting way to test
mem_cgroup_disabled(). Too many developer hours have been wasted on
confusing it with global_reclaim(): just use mem_cgroup_disabled().

Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Glauber Costa <glommer@parallels.com>
---
mm/vmscan.c | 18 ++++--------------
1 files changed, 4 insertions(+), 14 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 49f15ef..c684f44 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -164,26 +164,16 @@ static bool global_reclaim(struct scan_control *sc)
{
return !sc->target_mem_cgroup;
}
-
-static bool scanning_global_lru(struct mem_cgroup_zone *mz)
-{
- return !mz->mem_cgroup;
-}
#else
static bool global_reclaim(struct scan_control *sc)
{
return true;
}
-
-static bool scanning_global_lru(struct mem_cgroup_zone *mz)
-{
- return true;
-}
#endif

static struct zone_reclaim_stat *get_reclaim_stat(struct mem_cgroup_zone *mz)
{
- if (!scanning_global_lru(mz))
+ if (!mem_cgroup_disabled())
return mem_cgroup_get_reclaim_stat(mz->mem_cgroup, mz->zone);

return &mz->zone->reclaim_stat;
@@ -192,7 +182,7 @@ static struct zone_reclaim_stat *get_reclaim_stat(struct mem_cgroup_zone *mz)
static unsigned long zone_nr_lru_pages(struct mem_cgroup_zone *mz,
enum lru_list lru)
{
- if (!scanning_global_lru(mz))
+ if (!mem_cgroup_disabled())
return mem_cgroup_zone_nr_lru_pages(mz->mem_cgroup,
zone_to_nid(mz->zone),
zone_idx(mz->zone),
@@ -1806,7 +1796,7 @@ static int inactive_anon_is_low(struct mem_cgroup_zone *mz)
if (!total_swap_pages)
return 0;

- if (!scanning_global_lru(mz))
+ if (!mem_cgroup_disabled())
return mem_cgroup_inactive_anon_is_low(mz->mem_cgroup,
mz->zone);

@@ -1845,7 +1835,7 @@ static int inactive_file_is_low_global(struct zone *zone)
*/
static int inactive_file_is_low(struct mem_cgroup_zone *mz)
{
- if (!scanning_global_lru(mz))
+ if (!mem_cgroup_disabled())
return mem_cgroup_inactive_file_is_low(mz->mem_cgroup,
mz->zone);



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