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authorPaul Menage <menage@google.com>2008-04-29 01:00:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:09 -0700
commit06ecb27cfbf53ac2c7e397aa1619a6f9a98c5896 (patch)
tree1633e77714da0d6478b79bd74d95c7fc715db15c /kernel/sched.c
parente73d2c61d1fcbd3621688ae457b49509c8d4c601 (diff)
downloadlwn-06ecb27cfbf53ac2c7e397aa1619a6f9a98c5896.tar.gz
lwn-06ecb27cfbf53ac2c7e397aa1619a6f9a98c5896.zip
CGroups _s64 files: use read_s64/write_s64 in CFS cgroup for rt_runtime file
This removes some filesystem boilerplate from the CFS cgroup subsystem. Signed-off-by: Paul Menage <menage@google.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c46
1 files changed, 6 insertions, 40 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 2528fbd974b4..e2f7f5acc807 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -9073,48 +9073,14 @@ static u64 cpu_shares_read_u64(struct cgroup *cgrp, struct cftype *cft)
#ifdef CONFIG_RT_GROUP_SCHED
static ssize_t cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft,
- struct file *file,
- const char __user *userbuf,
- size_t nbytes, loff_t *unused_ppos)
+ s64 val)
{
- char buffer[64];
- int retval = 0;
- s64 val;
- char *end;
-
- if (!nbytes)
- return -EINVAL;
- if (nbytes >= sizeof(buffer))
- return -E2BIG;
- if (copy_from_user(buffer, userbuf, nbytes))
- return -EFAULT;
-
- buffer[nbytes] = 0; /* nul-terminate */
-
- /* strip newline if necessary */
- if (nbytes && (buffer[nbytes-1] == '\n'))
- buffer[nbytes-1] = 0;
- val = simple_strtoll(buffer, &end, 0);
- if (*end)
- return -EINVAL;
-
- /* Pass to subsystem */
- retval = sched_group_set_rt_runtime(cgroup_tg(cgrp), val);
- if (!retval)
- retval = nbytes;
- return retval;
+ return sched_group_set_rt_runtime(cgroup_tg(cgrp), val);
}
-static ssize_t cpu_rt_runtime_read(struct cgroup *cgrp, struct cftype *cft,
- struct file *file,
- char __user *buf, size_t nbytes,
- loff_t *ppos)
+static s64 cpu_rt_runtime_read(struct cgroup *cgrp, struct cftype *cft)
{
- char tmp[64];
- long val = sched_group_rt_runtime(cgroup_tg(cgrp));
- int len = sprintf(tmp, "%ld\n", val);
-
- return simple_read_from_buffer(buf, nbytes, ppos, tmp, len);
+ return sched_group_rt_runtime(cgroup_tg(cgrp));
}
static int cpu_rt_period_write_uint(struct cgroup *cgrp, struct cftype *cftype,
@@ -9140,8 +9106,8 @@ static struct cftype cpu_files[] = {
#ifdef CONFIG_RT_GROUP_SCHED
{
.name = "rt_runtime_us",
- .read = cpu_rt_runtime_read,
- .write = cpu_rt_runtime_write,
+ .read_s64 = cpu_rt_runtime_read,
+ .write_s64 = cpu_rt_runtime_write,
},
{
.name = "rt_period_us",