From 85cc59db12724e1248f5e4841e61339cf485d5c7 Mon Sep 17 00:00:00 2001 From: Pavel Emelyanov Date: Tue, 29 Apr 2008 01:00:20 -0700 Subject: [PATCH] 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 Acked-by: KAMEZAWA Hiroyuki Cc: Balbir Singh Cc: Paul Menage Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memcontrol.c | 21 ++++++--------------- 1 file 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", -- 2.20.1