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vmscan,memcg: memcg aware swap token

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Currently, memcg reclaim can disable swap token even if the swap token mm
doesn't belong in its memory cgroup.  It's slightly risky.  If an admin
creates very small mem-cgroup and silly guy runs contentious heavy memory
pressure workload, every tasks are going to lose swap token and then
system may become unresponsive.  That's bad.

This patch adds 'memcg' parameter into disable_swap_token().  and if the
parameter doesn't match swap token, VM doesn't disable it.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Rik van Riel<riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KOSAKI Motohiro
2011-06-15 15:08:13 -07:00
committed by Linus Torvalds
parent e1bbd19bc4
commit a433658c30
5 changed files with 85 additions and 36 deletions
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87
mm/thrash.c
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@@ -21,11 +21,31 @@
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/swap.h>
#include <linux/memcontrol.h>
static DEFINE_SPINLOCK(swap_token_lock);
struct mm_struct *swap_token_mm;
struct mem_cgroup *swap_token_memcg;
static unsigned int global_faults;
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
static struct mem_cgroup *swap_token_memcg_from_mm(struct mm_struct *mm)
{
struct mem_cgroup *memcg;
memcg = try_get_mem_cgroup_from_mm(mm);
if (memcg)
css_put(mem_cgroup_css(memcg));
return memcg;
}
#else
static struct mem_cgroup *swap_token_memcg_from_mm(struct mm_struct *mm)
{
return NULL;
}
#endif
void grab_swap_token(struct mm_struct *mm)
{
int current_interval;
@@ -38,40 +58,69 @@ void grab_swap_token(struct mm_struct *mm)
return;
/* First come first served */
if (swap_token_mm == NULL) {
mm->token_priority = mm->token_priority + 2;
swap_token_mm = mm;
if (!swap_token_mm)
goto replace_token;
if (mm == swap_token_mm) {
mm->token_priority += 2;
goto out;
}
if (mm != swap_token_mm) {
if (current_interval < mm->last_interval)
mm->token_priority++;
else {
if (likely(mm->token_priority > 0))
mm->token_priority--;
}
/* Check if we deserve the token */
if (mm->token_priority > swap_token_mm->token_priority) {
mm->token_priority += 2;
swap_token_mm = mm;
}
} else {
/* Token holder came in again! */
mm->token_priority += 2;
if (current_interval < mm->last_interval)
mm->token_priority++;
else {
if (likely(mm->token_priority > 0))
mm->token_priority--;
}
/* Check if we deserve the token */
if (mm->token_priority > swap_token_mm->token_priority)
goto replace_token;
out:
mm->faultstamp = global_faults;
mm->last_interval = current_interval;
spin_unlock(&swap_token_lock);
return;
replace_token:
mm->token_priority += 2;
swap_token_mm = mm;
swap_token_memcg = swap_token_memcg_from_mm(mm);
goto out;
}
/* Called on process exit. */
void __put_swap_token(struct mm_struct *mm)
{
spin_lock(&swap_token_lock);
if (likely(mm == swap_token_mm))
if (likely(mm == swap_token_mm)) {
swap_token_mm = NULL;
swap_token_memcg = NULL;
}
spin_unlock(&swap_token_lock);
}
static bool match_memcg(struct mem_cgroup *a, struct mem_cgroup *b)
{
if (!a)
return true;
if (!b)
return true;
if (a == b)
return true;
return false;
}
void disable_swap_token(struct mem_cgroup *memcg)
{
/* memcg reclaim don't disable unrelated mm token. */
if (match_memcg(memcg, swap_token_memcg)) {
spin_lock(&swap_token_lock);
if (match_memcg(memcg, swap_token_memcg)) {
swap_token_mm = NULL;
swap_token_memcg = NULL;
}
spin_unlock(&swap_token_lock);
}
}