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memcg: remove some redundant checks

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We don't need to check do_swap_account in the case that the function which
checks do_swap_account will never get called if do_swap_account == 0.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Li Zefan 2009-06-17 16:27:15 -07:00 committed by Linus Torvalds
parent 302362c5ab
commit 338c843108
2 changed files with 4 additions and 15 deletions
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11
mm/memcontrol.c
View file

@ -45,7 +45,7 @@ struct cgroup_subsys mem_cgroup_subsys __read_mostly;
#define MEM_CGROUP_RECLAIM_RETRIES 5 #define MEM_CGROUP_RECLAIM_RETRIES 5
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
/* Turned on only when memory cgroup is enabled && really_do_swap_account = 0 */ /* Turned on only when memory cgroup is enabled && really_do_swap_account = 1 */
int do_swap_account __read_mostly; int do_swap_account __read_mostly;
static int really_do_swap_account __initdata = 1; /* for remember boot option*/ static int really_do_swap_account __initdata = 1; /* for remember boot option*/
#else #else
@ -1763,16 +1763,14 @@ static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,
return ret; return ret;
} }
int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg, static int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg,
unsigned long long val) unsigned long long val)
{ {
int retry_count; int retry_count;
u64 memlimit, oldusage, curusage; u64 memlimit, oldusage, curusage;
int children = mem_cgroup_count_children(memcg); int children = mem_cgroup_count_children(memcg);
int ret = -EBUSY; int ret = -EBUSY;
if (!do_swap_account)
return -EINVAL;
/* see mem_cgroup_resize_res_limit */ /* see mem_cgroup_resize_res_limit */
retry_count = children * MEM_CGROUP_RECLAIM_RETRIES; retry_count = children * MEM_CGROUP_RECLAIM_RETRIES;
oldusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); oldusage = res_counter_read_u64(&memcg->memsw, RES_USAGE);
@ -2007,8 +2005,7 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
val = res_counter_read_u64(&mem->res, name); val = res_counter_read_u64(&mem->res, name);
break; break;
case _MEMSWAP: case _MEMSWAP:
if (do_swap_account) val = res_counter_read_u64(&mem->memsw, name);
val = res_counter_read_u64(&mem->memsw, name);
break; break;
default: default:
BUG(); BUG();

8
mm/page_cgroup.c
View file

@ -311,8 +311,6 @@ static int swap_cgroup_prepare(int type)
struct swap_cgroup_ctrl *ctrl; struct swap_cgroup_ctrl *ctrl;
unsigned long idx, max; unsigned long idx, max;
if (!do_swap_account)
return 0;
ctrl = &swap_cgroup_ctrl[type]; ctrl = &swap_cgroup_ctrl[type];
for (idx = 0; idx < ctrl->length; idx++) { for (idx = 0; idx < ctrl->length; idx++) {
@ -349,9 +347,6 @@ unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
struct swap_cgroup *sc; struct swap_cgroup *sc;
unsigned short old; unsigned short old;
if (!do_swap_account)
return 0;
ctrl = &swap_cgroup_ctrl[type]; ctrl = &swap_cgroup_ctrl[type];
mappage = ctrl->map[idx]; mappage = ctrl->map[idx];
@ -380,9 +375,6 @@ unsigned short lookup_swap_cgroup(swp_entry_t ent)
struct swap_cgroup *sc; struct swap_cgroup *sc;
unsigned short ret; unsigned short ret;
if (!do_swap_account)
return 0;
ctrl = &swap_cgroup_ctrl[type]; ctrl = &swap_cgroup_ctrl[type];
mappage = ctrl->map[idx]; mappage = ctrl->map[idx];
sc = page_address(mappage); sc = page_address(mappage);