This add the API which exports per-memcg kswapd thread pid. The kswapd
thread is named as "memcg_" + css_id, and the pid can be used to put
kswapd thread into cpu cgroup later.
$ mkdir /dev/cgroup/memory/A
$ cat /dev/cgroup/memory/A/memory.kswapd_pid
memcg_null 0
$ echo 500m >/dev/cgroup/memory/A/memory.limit_in_bytes
$ echo 50m >/dev/cgroup/memory/A/memory.high_wmark_distance
$ ps -ef | grep memcg
root 6727 2 0 14:32 ? 00:00:00 [memcg_3]
root 6729 6044 0 14:32 ttyS0 00:00:00 grep memcg
$ cat memory.kswapd_pid
memcg_3 6727
changelog v6..v5
1. Remove the legacy spinlock which has been removed from previous post.
changelog v5..v4
1. Initialize the memcg-kswapd pid to -1 instead of 0.
2. Remove the kswapds_spinlock.
changelog v4..v3
1. Add the API based on KAMAZAWA's request on patch v3.
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Signed-off-by: Ying Han <yinghan@xxxxxxxxxx>
---
mm/memcontrol.c | 31 +++++++++++++++++++++++++++++++
1 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d5b284c..0b108b9 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4533,6 +4533,33 @@ static int mem_cgroup_wmark_read(struct cgroup *cgrp,
return 0;
}
+static int mem_cgroup_kswapd_pid_read(struct cgroup *cgrp,
+ struct cftype *cft, struct cgroup_map_cb *cb)
+{
+ struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp);
+ struct task_struct *kswapd_thr = NULL;
+ struct kswapd *kswapd_p = NULL;
+ wait_queue_head_t *wait;
+ char name[TASK_COMM_LEN];
+ pid_t pid = -1;
+
+ sprintf(name, "memcg_null");
+
+ wait = mem_cgroup_kswapd_wait(mem);
+ if (wait) {
+ kswapd_p = container_of(wait, struct kswapd, kswapd_wait);
+ kswapd_thr = kswapd_p->kswapd_task;
+ if (kswapd_thr) {
+ get_task_comm(name, kswapd_thr);
+ pid = kswapd_thr->pid;
+ }
+ }
+
+ cb->fill(cb, name, pid);
+
+ return 0;
+}
+
static int mem_cgroup_oom_control_read(struct cgroup *cgrp,
struct cftype *cft, struct cgroup_map_cb *cb)
{
@@ -4650,6 +4677,10 @@ static struct cftype mem_cgroup_files[] = {
.name = "reclaim_wmarks",
.read_map = mem_cgroup_wmark_read,
},
+ {
+ .name = "kswapd_pid",
+ .read_map = mem_cgroup_kswapd_pid_read,
+ },
};
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
--
1.7.3.1
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxxx For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>