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mm/memcg: scanning_global_lru means mem_cgroup_disabled 

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>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2012-05-29 15:06:52 -07:00 committed by Linus Torvalds
parent 86493009d3
commit c3c787e8c3
1 changed files with 4 additions and 14 deletions
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18
mm/vmscan.c
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@ -140,26 +140,16 @@ static bool global_reclaim(struct scan_control *sc)
{ {
return !sc->target_mem_cgroup; return !sc->target_mem_cgroup;
} }
static bool scanning_global_lru(struct mem_cgroup_zone *mz)
{
return !mz->mem_cgroup;
}
#else #else
static bool global_reclaim(struct scan_control *sc) static bool global_reclaim(struct scan_control *sc)
{ {
return true; return true;
} }
static bool scanning_global_lru(struct mem_cgroup_zone *mz)
{
return true;
}
#endif #endif
static struct zone_reclaim_stat *get_reclaim_stat(struct mem_cgroup_zone *mz) 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 mem_cgroup_get_reclaim_stat(mz->mem_cgroup, mz->zone);
return &mz->zone->reclaim_stat; return &mz->zone->reclaim_stat;
@ -168,7 +158,7 @@ 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, static unsigned long zone_nr_lru_pages(struct mem_cgroup_zone *mz,
enum lru_list lru) enum lru_list lru)
{ {
if (!scanning_global_lru(mz)) if (!mem_cgroup_disabled())
return mem_cgroup_zone_nr_lru_pages(mz->mem_cgroup, return mem_cgroup_zone_nr_lru_pages(mz->mem_cgroup,
zone_to_nid(mz->zone), zone_to_nid(mz->zone),
zone_idx(mz->zone), zone_idx(mz->zone),
@ -1589,7 +1579,7 @@ static int inactive_anon_is_low(struct mem_cgroup_zone *mz)
if (!total_swap_pages) if (!total_swap_pages)
return 0; return 0;
if (!scanning_global_lru(mz)) if (!mem_cgroup_disabled())
return mem_cgroup_inactive_anon_is_low(mz->mem_cgroup, return mem_cgroup_inactive_anon_is_low(mz->mem_cgroup,
mz->zone); mz->zone);
@ -1628,7 +1618,7 @@ static int inactive_file_is_low_global(struct zone *zone)
*/ */
static int inactive_file_is_low(struct mem_cgroup_zone *mz) 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, return mem_cgroup_inactive_file_is_low(mz->mem_cgroup,
mz->zone); mz->zone);