[Devel] [RFC][PATCH 5/7] CGroup API: Use read_uint in memory controller

[Paul Menage]

Update the memory controller to use read_uint for its
limit/usage/failcnt control files, calling the new
res_counter_read_uint() function. This allows the files to show up as
u64 rather than string in the cgroup.api file.

Signed-off-by: Paul Menage <menage at google.com>

---
 mm/memcontrol.c |   15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

Index: cgroupmap-2.6.24-mm1/mm/memcontrol.c
===================================================================
--- cgroupmap-2.6.24-mm1.orig/mm/memcontrol.c
+++ cgroupmap-2.6.24-mm1/mm/memcontrol.c
@@ -922,13 +922,10 @@ int mem_cgroup_write_strategy(char *buf,
 	return 0;
 }
 
-static ssize_t mem_cgroup_read(struct cgroup *cont,
-			struct cftype *cft, struct file *file,
-			char __user *userbuf, size_t nbytes, loff_t *ppos)
+static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
 {
-	return res_counter_read(&mem_cgroup_from_cont(cont)->res,
-				cft->private, userbuf, nbytes, ppos,
-				NULL);
+	return res_counter_read_uint(&mem_cgroup_from_cont(cont)->res,
+				     cft->private);
 }
 
 static ssize_t mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
@@ -1006,18 +1003,18 @@ static struct cftype mem_cgroup_files[] 
 	{
 		.name = "usage_in_bytes",
 		.private = RES_USAGE,
-		.read = mem_cgroup_read,
+		.read_uint = mem_cgroup_read,
 	},
 	{
 		.name = "limit_in_bytes",
 		.private = RES_LIMIT,
 		.write = mem_cgroup_write,
-		.read = mem_cgroup_read,
+		.read_uint = mem_cgroup_read,
 	},
 	{
 		.name = "failcnt",
 		.private = RES_FAILCNT,
-		.read = mem_cgroup_read,
+		.read_uint = mem_cgroup_read,
 	},
 	{
 		.name = "force_empty",

--
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