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Subject[patch 2/2] 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>

---
kernel/sched.c | 24 ++++++++++++++++++++++++
1 files changed, 24 insertions(+)

Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c 2008-02-28 20:05:27.000000000 +0530
+++ linux-2.6/kernel/sched.c 2008-02-28 20:05:30.000000000 +0530
@@ -8243,10 +8243,34 @@ static u64 cpuusage_read(struct cgroup *
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,
},
};

--
regards,
Dhaval



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