On 05/30/2012 02:43 PM, Peter Zijlstra wrote:
On Wed, 2012-05-30 at 14:34 +0400, Glauber Costa wrote:
On 05/30/2012 02:34 PM, Peter Zijlstra wrote:
On Wed, 2012-05-30 at 13:48 +0400, Glauber Costa wrote:
+static int cpuacct_stats_percpu_show(struct cgroup *cgrp, struct cftype *cft,
+ struct cgroup_map_cb *cb)
+{
+ struct cpuacct *ca = cgroup_ca(cgrp);
+ int cpu;
+
+ for_each_online_cpu(cpu) {
+ do_fill_cb(cb, ca, "user", cpu, CPUTIME_USER);
+ do_fill_cb(cb, ca, "nice", cpu, CPUTIME_NICE);
+ do_fill_cb(cb, ca, "system", cpu, CPUTIME_SYSTEM);
+ do_fill_cb(cb, ca, "irq", cpu, CPUTIME_IRQ);
+ do_fill_cb(cb, ca, "softirq", cpu, CPUTIME_SOFTIRQ);
+ do_fill_cb(cb, ca, "guest", cpu, CPUTIME_GUEST);
+ do_fill_cb(cb, ca, "guest_nice", cpu, CPUTIME_GUEST_NICE);
+ }
+
+ return 0;
+}
Uhm, hotplug anyone?
What's with hotplug ?
Who's to say all cpus are online at this point? If you don't want to
make the files come and go with hotplug, one should use
for_each_possible_cpu().
I don't oppose that.
But I don't really parse what you mean by "make the files go away". We
have just one file, with multiple entries. The entries are in key:value
form, so I don't see a huge problem in having some entries disappearing.
As a matter of fact, this is exactly what happens in /proc/stat when you
offline a cpu: the correspondent line will stop showing up.
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