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authorPavel Emelyanov <xemul@openvz.org>2008-04-29 01:00:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:10 -0700
commit85cc59db12724e1248f5e4841e61339cf485d5c7 (patch)
tree960340cafba30181a1e2f60c93cd54a6fdb637ff
parentb6ac57d50a375aa2f267e1b2b56c46564a936d00 (diff)
memcgroup: use triggers in force_empty and max_usage files
These two files are essentially event callbacks. They do not care about the contents of the string, but only about the fact of the write itself. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/memcontrol.c21
1 files changed, 6 insertions, 15 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f4079692cbf5..dc3472f9f68c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -857,27 +857,18 @@ static ssize_t mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
mem_cgroup_write_strategy);
}
-static ssize_t mem_cgroup_max_reset(struct cgroup *cont, struct cftype *cft,
- struct file *file, const char __user *userbuf,
- size_t nbytes, loff_t *ppos)
+static int mem_cgroup_max_reset(struct cgroup *cont, unsigned int event)
{
struct mem_cgroup *mem;
mem = mem_cgroup_from_cont(cont);
res_counter_reset_max(&mem->res);
- return nbytes;
+ return 0;
}
-static ssize_t mem_force_empty_write(struct cgroup *cont,
- struct cftype *cft, struct file *file,
- const char __user *userbuf,
- size_t nbytes, loff_t *ppos)
+static int mem_force_empty_write(struct cgroup *cont, unsigned int event)
{
- struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
- int ret = mem_cgroup_force_empty(mem);
- if (!ret)
- ret = nbytes;
- return ret;
+ return mem_cgroup_force_empty(mem_cgroup_from_cont(cont));
}
static const struct mem_cgroup_stat_desc {
@@ -925,7 +916,7 @@ static struct cftype mem_cgroup_files[] = {
{
.name = "max_usage_in_bytes",
.private = RES_MAX_USAGE,
- .write = mem_cgroup_max_reset,
+ .trigger = mem_cgroup_max_reset,
.read_u64 = mem_cgroup_read,
},
{
@@ -941,7 +932,7 @@ static struct cftype mem_cgroup_files[] = {
},
{
.name = "force_empty",
- .write = mem_force_empty_write,
+ .trigger = mem_force_empty_write,
},
{
.name = "stat",