The patch titled
memcg: add cgroupfs interface to memcg dirty limits
has been added to the -mm tree. Its filename is
memcg-add-cgroupfs-interface-to-memcg-dirty-limits.patch
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------------------------------------------------------
Subject: memcg: add cgroupfs interface to memcg dirty limits
From: Greg Thelen <gthelen@xxxxxxxxxx>
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@xxxxxxxxxxx>
Signed-off-by: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Thelen <gthelen@xxxxxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Cc: Chad Talbott <ctalbott@xxxxxxxxxx>
Cc: Justin TerAvest <teravest@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 114 insertions(+)
diff -puN mm/memcontrol.c~memcg-add-cgroupfs-interface-to-memcg-dirty-limits mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-add-cgroupfs-interface-to-memcg-dirty-limits
+++ a/mm/memcontrol.c
@@ -113,6 +113,13 @@ 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];
@@ -4391,6 +4398,89 @@ static int mem_cgroup_oom_control_write(
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",
@@ -4454,6 +4544,30 @@ 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
_
Patches currently in -mm which might be from gthelen@xxxxxxxxxx are
linux-next.patch
memcg-res_counter_read_u64-fix-potential-races-on-32-bit-machines.patch
memcg-break-out-event-counters-from-other-stats.patch
memcg-use-native-word-page-statistics-counters.patch
mm-memcontrolc-suppress-uninitializer-var-warning-with-older-gccs.patch
memcg-document-cgroup-dirty-memory-interfaces.patch
memcg-add-page_cgroup-flags-for-dirty-page-tracking.patch
memcg-add-dirty-page-accounting-infrastructure.patch
memcg-add-kernel-calls-for-memcg-dirty-page-stats.patch
memcg-add-dirty-limits-to-mem_cgroup.patch
memcg-add-cgroupfs-interface-to-memcg-dirty-limits.patch
memcg-add-dirty-limiting-routines.patch
memcg-check-memcg-dirty-limits-in-page-writeback.patch
memcg-make-background-writeback-memcg-aware.patch
--
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