From: Pekka Enberg <penberg@cs.helsinki.fi>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: "Ingo Molnar" <mingo@elte.hu>, "Andi Kleen" <andi@firstfloor.org>,
"Wu Fengguang" <fengguang.wu@intel.com>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Fr馘駻ic Weisbecker" <fweisbec@gmail.com>,
"Larry Woodman" <lwoodman@redhat.com>,
"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
"Eduard - Gabriel Munteanu" <eduard.munteanu@linux360.ro>,
"Andrew Morton" <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
"Matt Mackall" <mpm@selenic.com>,
"Alexey Dobriyan" <adobriyan@gmail.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [PATCH 5/5] proc: export more page flags in /proc/kpageflags
Date: Tue, 28 Apr 2009 13:21:50 +0300 [thread overview]
Message-ID: <84144f020904280321u4be9fb10t6f0123b589752b80@mail.gmail.com> (raw)
In-Reply-To: <20090428190822.EBED.A69D9226@jp.fujitsu.com>
Hi!
2009/4/28 KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>:
>> I guess the main question here is whether this approach will scale to
>> something like kmalloc() or the page allocator in production
>> environments. For any serious workload, the frequency of events is
>> going to be pretty high.
>
> Immediate Values patch series makes zero-overhead to tracepoint
> while it's not used.
>
> So, We have to implement to stop collect stastics way. it restore
> zero overhead world.
> We don't lose any performance by trace.
Sure but I meant the _enabled_ case here. kmalloc() (and the page
allocator to some extent) is very performance sensitive in many
workloads so you probably don't want to use tracepoints if you're
collecting some overall statistics (i.e. tracing all events) like we
do here.
Pekka
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next prev parent reply other threads:[~2009-04-28 10:21 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-28 1:09 [PATCH 0/5] proc: export more page flags in /proc/kpageflags (take 4) Wu Fengguang
2009-04-28 1:09 ` [PATCH 1/5] pagemap: document clarifications Wu Fengguang
2009-04-28 7:11 ` Tommi Rantala
2009-04-28 1:09 ` [PATCH 2/5] pagemap: documentation 9 more exported page flags Wu Fengguang
2009-04-28 1:09 ` [PATCH 3/5] mm: introduce PageHuge() for testing huge/gigantic pages Wu Fengguang
2009-04-28 1:09 ` [PATCH 4/5] proc: kpagecount/kpageflags code cleanup Wu Fengguang
2009-04-28 1:09 ` [PATCH 5/5] proc: export more page flags in /proc/kpageflags Wu Fengguang
2009-04-28 6:55 ` Ingo Molnar
2009-04-28 7:40 ` Andi Kleen
2009-04-28 9:04 ` Pekka Enberg
2009-04-28 9:10 ` Andi Kleen
2009-04-28 9:15 ` Pekka Enberg
2009-04-28 9:15 ` Ingo Molnar
2009-04-28 9:19 ` Pekka Enberg
2009-04-28 9:25 ` Pekka Enberg
2009-04-28 9:36 ` Wu Fengguang
2009-04-28 9:36 ` Ingo Molnar
2009-04-28 9:57 ` Pekka Enberg
2009-04-28 10:10 ` KOSAKI Motohiro
2009-04-28 10:21 ` Pekka Enberg [this message]
2009-04-28 10:56 ` Ingo Molnar
2009-04-28 11:09 ` KOSAKI Motohiro
2009-04-28 12:42 ` Ingo Molnar
2009-04-28 11:03 ` Ingo Molnar
2009-04-28 17:42 ` Matt Mackall
2009-04-28 9:29 ` Ingo Molnar
2009-04-28 9:34 ` KOSAKI Motohiro
2009-04-28 9:38 ` Ingo Molnar
2009-04-28 9:55 ` Wu Fengguang
2009-04-28 10:11 ` KOSAKI Motohiro
2009-04-28 11:05 ` Ingo Molnar
2009-04-28 11:36 ` Wu Fengguang
2009-04-28 12:17 ` [rfc] object collection tracing (was: [PATCH 5/5] proc: export more page flags in /proc/kpageflags) Ingo Molnar
2009-04-28 13:31 ` Wu Fengguang
2009-05-12 13:01 ` Frederic Weisbecker
2009-05-17 13:36 ` Wu Fengguang
2009-05-17 13:55 ` Frederic Weisbecker
2009-05-17 14:12 ` Wu Fengguang
2009-05-18 11:44 ` KOSAKI Motohiro
2009-05-18 11:47 ` Wu Fengguang
2009-04-28 10:18 ` [PATCH 5/5] proc: export more page flags in /proc/kpageflags Andi Kleen
2009-04-28 8:33 ` Wu Fengguang
2009-04-28 9:24 ` Ingo Molnar
2009-04-28 18:11 ` Tony Luck
2009-04-28 18:34 ` Matt Mackall
2009-04-28 20:47 ` Tony Luck
2009-04-28 20:54 ` Andi Kleen
2009-04-28 20:59 ` Matt Mackall
2009-04-28 21:17 ` Andrew Morton
2009-04-28 21:49 ` Matt Mackall
2009-04-29 0:02 ` Robin Holt
2009-04-28 17:49 ` Matt Mackall
2009-04-29 8:05 ` Wu Fengguang
2009-04-29 19:13 ` Matt Mackall
2009-04-30 1:00 ` Wu Fengguang
2009-04-28 21:32 ` Andrew Morton
2009-04-28 22:46 ` Matt Mackall
2009-04-28 23:02 ` Andrew Morton
2009-04-28 23:31 ` Matt Mackall
2009-04-28 23:42 ` Andrew Morton
2009-04-28 23:55 ` Matt Mackall
2009-04-29 3:33 ` Wu Fengguang
2009-04-29 2:38 ` Wu Fengguang
2009-04-29 2:55 ` Andrew Morton
2009-04-29 3:48 ` Wu Fengguang
2009-04-29 5:09 ` Wu Fengguang
2009-04-29 4:41 ` Nathan Lynch
2009-04-29 4:50 ` Andrew Morton
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