linux-kernel - [PATCH] change cpuacct usage percpu format

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-next>] [day] [month] [year] [list]

Message-Id: <20090227140537.390905c4.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 27 Feb 2009 14:05:37 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	kenchen@...gle.com, "menage@...gle.com" <menage@...gle.com>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	mingo@...e.hu,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: [PATCH] change cpuacct usage percpu format

I'd like to change cpuacct.usage_percpu format before it's widely used.
Current format is not easy to use in hardware with DR feature.

==
cpuacct.usage_percpu shows per cpu usage information via cgroupfs.
It shows all present cpus information and "whose information ?"
is explained just by index of data implicitly.

IIRC, there is physical cpu hotplug and it can remove
cpus and change present map. Considering a software which records
this information pediodically(like sar.), its better to show id of cpu
in explict way.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
 kernel/sched.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: mmotm-2.6.29-Feb24/kernel/sched.c
===================================================================
--- mmotm-2.6.29-Feb24.orig/kernel/sched.c
+++ mmotm-2.6.29-Feb24/kernel/sched.c
@@ -9719,7 +9719,7 @@ static int cpuacct_percpu_seq_read(struc
 
 	for_each_present_cpu(i) {
 		percpu = cpuacct_cpuusage_read(ca, i);
-		seq_printf(m, "%llu ", (unsigned long long) percpu);
+		seq_printf(m, "%d %llu\n", i, (unsigned long long) percpu);
 	}
 	seq_printf(m, "\n");
 	return 0;

--
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/