linux-kernel - Re: [patch] export percpu cpuacct cgroup stats

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <b040c32a0812051016q7912688dw2c663a77121a8f18@mail.gmail.com>
Date:	Fri, 5 Dec 2008 10:16:30 -0800
From:	Ken Chen <kenchen@...gle.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Li Zefan <lizf@...fujitsu.com>, Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch] export percpu cpuacct cgroup stats

On Fri, Dec 5, 2008 at 5:52 AM, Ingo Molnar <mingo@...e.hu> wrote:
> Could someone please send the final patch with a final changelog, with
> all fixlets and tags in place please?

Here it is:

This patch export per-cpu CPU cycle usage for a given cpuacct cgroup.
There is a need for a user space monitor daemon to track group CPU
usage on per-cpu base.  It is also useful for monitoring CFS load
balancer behavior by tracking per CPU group usage.


Signed-off-by: Ken Chen <kenchen@...gle.com>
Reviewed-by: Li Zefan <lizf@...fujitsu.com>

diff --git a/kernel/sched.c b/kernel/sched.c
index b7480fb..055c54f 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -9345,12 +9345,34 @@ out:
 	return err;
 }

+static int cpuacct_percpu_seq_read(struct cgroup *cgroup, struct cftype *cft,
+				   struct seq_file *m)
+{
+	struct cpuacct *ca = cgroup_ca(cgroup);
+	u64 percpu;
+	int i;
+
+	for_each_possible_cpu(i) {
+		spin_lock_irq(&cpu_rq(i)->lock);
+		percpu = *percpu_ptr(ca->cpuusage, i);
+		spin_unlock_irq(&cpu_rq(i)->lock);
+		seq_printf(m, "%llu ", (unsigned long long) percpu);
+	}
+	seq_printf(m, "\n");
+	return 0;
+}
+
 static struct cftype files[] = {
 	{
 		.name = "usage",
 		.read_u64 = cpuusage_read,
 		.write_u64 = cpuusage_write,
 	},
+	{
+		.name = "usage_percpu",
+		.read_seq_string = cpuacct_percpu_seq_read,
+	},
+
 };

 static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/