summaryrefslogtreecommitdiffstats
path: root/mm/thrash.c
diff options
context:
space:
mode:
Diffstat (limited to 'mm/thrash.c')
-rw-r--r--mm/thrash.c87
1 files changed, 68 insertions, 19 deletions
diff --git a/mm/thrash.c b/mm/thrash.c
index 2372d4e..6cdf865 100644
--- a/mm/thrash.c
+++ b/mm/thrash.c
@@ -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);
+ }
+}
OpenPOWER on IntegriCloud