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Subject[RFC][PATCH v7 07/14] memcg: add cgroupfs interface to memcg dirty limits
Date
Add cgroupfs interface to memcg dirty page limits:
Direct write-out is controlled with:
- memory.dirty_ratio
- memory.dirty_limit_in_bytes

Background write-out is controlled with:
- memory.dirty_background_ratio
- memory.dirty_background_limit_bytes

Other memcg cgroupfs files support 'M', 'm', 'k', 'K', 'g'
and 'G' suffixes for byte counts. This patch provides the
same functionality for memory.dirty_limit_in_bytes and
memory.dirty_background_limit_bytes.

Signed-off-by: Andrea Righi <arighi@develer.com>
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Greg Thelen <gthelen@google.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
Changelog since v3:
- Make use of new routine, __mem_cgroup_has_dirty_limit(), to disable memcg
dirty limits when use_hierarchy=1.
Changelog since v1:
- Renamed newly created proc files:
- memory.dirty_bytes -> memory.dirty_limit_in_bytes
- memory.dirty_background_bytes -> memory.dirty_background_limit_in_bytes
- Allow [kKmMgG] suffixes for newly created dirty limit value cgroupfs files.

mm/memcontrol.c | 114 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 114 insertions(+), 0 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f496677..248396c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -126,6 +126,13 @@ enum mem_cgroup_events_target {
#define THRESHOLDS_EVENTS_TARGET (128)
#define SOFTLIMIT_EVENTS_TARGET (1024)

+enum {
+ MEM_CGROUP_DIRTY_RATIO,
+ MEM_CGROUP_DIRTY_LIMIT_IN_BYTES,
+ MEM_CGROUP_DIRTY_BACKGROUND_RATIO,
+ MEM_CGROUP_DIRTY_BACKGROUND_LIMIT_IN_BYTES,
+};
+
struct mem_cgroup_stat_cpu {
long count[MEM_CGROUP_STAT_NSTATS];
unsigned long events[MEM_CGROUP_EVENTS_NSTATS];
@@ -4638,6 +4645,89 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp,
return 0;
}

+static u64 mem_cgroup_dirty_read(struct cgroup *cgrp, struct cftype *cft)
+{
+ struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp);
+ bool use_sys = !mem_cgroup_has_dirty_limit(mem);
+
+ switch (cft->private) {
+ case MEM_CGROUP_DIRTY_RATIO:
+ return use_sys ? vm_dirty_ratio : mem->dirty_param.dirty_ratio;
+ case MEM_CGROUP_DIRTY_LIMIT_IN_BYTES:
+ return use_sys ? vm_dirty_bytes : mem->dirty_param.dirty_bytes;
+ case MEM_CGROUP_DIRTY_BACKGROUND_RATIO:
+ return use_sys ? dirty_background_ratio :
+ mem->dirty_param.dirty_background_ratio;
+ case MEM_CGROUP_DIRTY_BACKGROUND_LIMIT_IN_BYTES:
+ return use_sys ? dirty_background_bytes :
+ mem->dirty_param.dirty_background_bytes;
+ default:
+ BUG();
+ }
+}
+
+static int
+mem_cgroup_dirty_write_string(struct cgroup *cgrp, struct cftype *cft,
+ const char *buffer)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+ int type = cft->private;
+ int ret = -EINVAL;
+ unsigned long long val;
+
+ if (!mem_cgroup_has_dirty_limit(memcg))
+ return ret;
+
+ switch (type) {
+ case MEM_CGROUP_DIRTY_LIMIT_IN_BYTES:
+ /* This function does all necessary parse...reuse it */
+ ret = res_counter_memparse_write_strategy(buffer, &val);
+ if (ret)
+ break;
+ memcg->dirty_param.dirty_bytes = val;
+ memcg->dirty_param.dirty_ratio = 0;
+ break;
+ case MEM_CGROUP_DIRTY_BACKGROUND_LIMIT_IN_BYTES:
+ ret = res_counter_memparse_write_strategy(buffer, &val);
+ if (ret)
+ break;
+ memcg->dirty_param.dirty_background_bytes = val;
+ memcg->dirty_param.dirty_background_ratio = 0;
+ break;
+ default:
+ BUG();
+ break;
+ }
+ return ret;
+}
+
+static int
+mem_cgroup_dirty_write(struct cgroup *cgrp, struct cftype *cft, u64 val)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+ int type = cft->private;
+
+ if (!mem_cgroup_has_dirty_limit(memcg))
+ return -EINVAL;
+ if ((type == MEM_CGROUP_DIRTY_RATIO ||
+ type == MEM_CGROUP_DIRTY_BACKGROUND_RATIO) && val > 100)
+ return -EINVAL;
+ switch (type) {
+ case MEM_CGROUP_DIRTY_RATIO:
+ memcg->dirty_param.dirty_ratio = val;
+ memcg->dirty_param.dirty_bytes = 0;
+ break;
+ case MEM_CGROUP_DIRTY_BACKGROUND_RATIO:
+ memcg->dirty_param.dirty_background_ratio = val;
+ memcg->dirty_param.dirty_background_bytes = 0;
+ break;
+ default:
+ BUG();
+ break;
+ }
+ return 0;
+}
+
static struct cftype mem_cgroup_files[] = {
{
.name = "usage_in_bytes",
@@ -4701,6 +4791,30 @@ static struct cftype mem_cgroup_files[] = {
.unregister_event = mem_cgroup_oom_unregister_event,
.private = MEMFILE_PRIVATE(_OOM_TYPE, OOM_CONTROL),
},
+ {
+ .name = "dirty_ratio",
+ .read_u64 = mem_cgroup_dirty_read,
+ .write_u64 = mem_cgroup_dirty_write,
+ .private = MEM_CGROUP_DIRTY_RATIO,
+ },
+ {
+ .name = "dirty_limit_in_bytes",
+ .read_u64 = mem_cgroup_dirty_read,
+ .write_string = mem_cgroup_dirty_write_string,
+ .private = MEM_CGROUP_DIRTY_LIMIT_IN_BYTES,
+ },
+ {
+ .name = "dirty_background_ratio",
+ .read_u64 = mem_cgroup_dirty_read,
+ .write_u64 = mem_cgroup_dirty_write,
+ .private = MEM_CGROUP_DIRTY_BACKGROUND_RATIO,
+ },
+ {
+ .name = "dirty_background_limit_in_bytes",
+ .read_u64 = mem_cgroup_dirty_read,
+ .write_string = mem_cgroup_dirty_write_string,
+ .private = MEM_CGROUP_DIRTY_BACKGROUND_LIMIT_IN_BYTES,
+ },
};

#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
--
1.7.3.1


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