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Message-ID: <b040c32a0902271213q3dd1931foc2b955d8a028eb6f@mail.gmail.com> Date: Fri, 27 Feb 2009 12:13:10 -0800 From: Ken Chen <kenchen@...gle.com> To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "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: Re: [PATCH] change cpuacct usage percpu format v2 On Thu, Feb 26, 2009 at 11:29 PM, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote: > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> > > 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 system and it can remove > cpus and change map. Considering a software which records > this information pediodically(like sar), its better to show id of cpu > in explict way. The new format carries a lot of overhead. I would think user space software can record /sys/devices/system/cpu/present and use that to map cpu index. - Ken -- 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/
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