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memcg: mem+swap controller Kconfig

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Config and control variable for mem+swap controller.

This patch adds CONFIG_CGROUP_MEM_RES_CTLR_SWAP
(memory resource controller swap extension.)

For accounting swap, it's obvious that we have to use additional memory to
remember "who uses swap".  This adds more overhead.  So, it's better to
offer "choice" to users.  This patch adds 2 choices.

This patch adds 2 parameters to enable swap extension or not.
  - CONFIG
  - boot option

Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2009-01-07 18:07:57 -08:00 committed by Linus Torvalds
parent d13d144309
commit c077719be8
4 changed files with 57 additions and 0 deletions
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3
Documentation/kernel-parameters.txt
View file

@ -1562,6 +1562,9 @@ and is between 256 and 4096 characters. It is defined in the file
nosoftlockup [KNL] Disable the soft-lockup detector.
noswapaccount [KNL] Disable accounting of swap in memory resource
controller. (See Documentation/controllers/memory.txt)
nosync [HW,M68K] Disables sync negotiation for all devices.
notsc [BUGS=X86-32] Disable Time Stamp Counter

3
include/linux/memcontrol.h
View file

@ -77,6 +77,9 @@ extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
extern long mem_cgroup_calc_reclaim(struct mem_cgroup *mem, struct zone *zone,
int priority, enum lru_list lru);
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
extern int do_swap_account;
#endif
#else /* CONFIG_CGROUP_MEM_RES_CTLR */
struct mem_cgroup;

17
init/Kconfig
View file

@ -428,6 +428,23 @@ config CGROUP_MEM_RES_CTLR
config MM_OWNER
bool
config CGROUP_MEM_RES_CTLR_SWAP
bool "Memory Resource Controller Swap Extension(EXPERIMENTAL)"
depends on CGROUP_MEM_RES_CTLR && SWAP && EXPERIMENTAL
help
Add swap management feature to memory resource controller. When you
enable this, you can limit mem+swap usage per cgroup. In other words,
when you disable this, memory resource controller has no cares to
usage of swap...a process can exhaust all of the swap. This extension
is useful when you want to avoid exhaustion swap but this itself
adds more overheads and consumes memory for remembering information.
Especially if you use 32bit system or small memory system, please
be careful about enabling this. When memory resource controller
is disabled by boot option, this will be automatically disabled and
there will be no overhead from this. Even when you set this config=y,
if boot option "noswapaccount" is set, swap will not be accounted.
endmenu
config SYSFS_DEPRECATED

34
mm/memcontrol.c
View file

@ -41,6 +41,15 @@
struct cgroup_subsys mem_cgroup_subsys __read_mostly;
#define MEM_CGROUP_RECLAIM_RETRIES 5
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
/* Turned on only when memory cgroup is enabled && really_do_swap_account = 0 */
int do_swap_account __read_mostly;
static int really_do_swap_account __initdata = 1; /* for remember boot option*/
#else
#define do_swap_account (0)
#endif
/*
* Statistics for memory cgroup.
*/
@ -1404,6 +1413,18 @@ static void mem_cgroup_free(struct mem_cgroup *mem)
}
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
static void __init enable_swap_cgroup(void)
{
if (!mem_cgroup_subsys.disabled && really_do_swap_account)
do_swap_account = 1;
}
#else
static void __init enable_swap_cgroup(void)
{
}
#endif
static struct cgroup_subsys_state *
mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
{
@ -1419,6 +1440,9 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
for_each_node_state(node, N_POSSIBLE)
if (alloc_mem_cgroup_per_zone_info(mem, node))
goto free_out;
/* root ? */
if (cont->parent == NULL)
enable_swap_cgroup();
return &mem->css;
free_out:
@ -1490,3 +1514,13 @@ struct cgroup_subsys mem_cgroup_subsys = {
.attach = mem_cgroup_move_task,
.early_init = 0,
};
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
static int __init disable_swap_account(char *s)
{
really_do_swap_account = 0;
return 1;
}
__setup("noswapaccount", disable_swap_account);
#endif