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authorDhaval Giani <dhaval@linux.vnet.ibm.com>2008-02-29 10:02:44 +0530
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:44:58 +0200
commit0297b80339d545045490716fa8591b215fdd9458 (patch)
tree3a00c5bd83fc3f0493a2a26b95db0c4a7e4bb691 /kernel/sched.c
parent32cd756a80aaef657ac09c76e6eff3ba65567790 (diff)
downloadblackbird-op-linux-0297b80339d545045490716fa8591b215fdd9458.tar.gz
blackbird-op-linux-0297b80339d545045490716fa8591b215fdd9458.zip
sched: allow cpuacct stats to be reset
Currently the schedstats implementation does not allow the statistics to be reset. This patch aims to allow that. echo 0 > cpuacct.usage resets the usage. Any other value is not allowed and returns -EINVAL. Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index e2f85c7a7476..e4bf4477aee5 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -8381,10 +8381,34 @@ static u64 cpuusage_read(struct cgroup *cgrp, struct cftype *cft)
return totalcpuusage;
}
+static int cpuusage_write(struct cgroup *cgrp, struct cftype *cftype,
+ u64 reset)
+{
+ struct cpuacct *ca = cgroup_ca(cgrp);
+ int err = 0;
+ int i;
+
+ if (reset) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ for_each_possible_cpu(i) {
+ u64 *cpuusage = percpu_ptr(ca->cpuusage, i);
+
+ spin_lock_irq(&cpu_rq(i)->lock);
+ *cpuusage = 0;
+ spin_unlock_irq(&cpu_rq(i)->lock);
+ }
+out:
+ return err;
+}
+
static struct cftype files[] = {
{
.name = "usage",
.read_uint = cpuusage_read,
+ .write_uint = cpuusage_write,
},
};
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