From: Stephane Eranian <eranian@google.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: "Peter Zijlstra" <peterz@infradead.org>,
"Jiri Olsa" <jolsa@redhat.com>,
"Yunlong Song" <yunlong.song@huawei.com>,
"Don Zickus" <dzickus@redhat.com>,
"David Ahern" <dsahern@gmail.com>,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
"Joe Mario" <jmario@redhat.com>, "Mike Galbraith" <efault@gmx.de>,
"Paul Mackerras" <paulus@samba.org>,
"Richard Fowles" <rfowles@redhat.com>,
"acme@kernel.org >> Arnaldo Carvalho de Melo" <acme@kernel.org>,
"mingo@redhat.com" <mingo@redhat.com>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Jiri Olsa" <jolsa@kernel.org>,
"wangnan0@huawei.com >> Wang Nan" <wangnan0@huawei.com>,
"Richard Fowles" <fowles@inreach.com>,
"Namhyung Kim" <namhyung@kernel.org>
Subject: Re: [Questions] perf c2c: What's the current status of perf c2c?
Date: Wed, 9 Dec 2015 09:15:04 -0800 [thread overview]
Message-ID: <CABPqkBSR+haJr-uzn3xjbP5aZ_x70FDi7ufgJi3wW7PitfqBwA@mail.gmail.com> (raw)
In-Reply-To: <20151209165807.GP15533@two.firstfloor.org>
Hi,
On Wed, Dec 9, 2015 at 8:58 AM, Andi Kleen <andi@firstfloor.org> wrote:
>> > the plan for me is to to use it some more to prove it's useful
>> > and kick it to be merged with perf at some point
>>
>> So I never really liked the c2c tool because it was so narrowly
>> focussed, it only works on NUMA thingies IIRC.
>
> It should work on all systems with an Intel Core (not Atom)
>
> However it was never clear to me if the tool was any better
> than simply sampling for
>
> mem_load_uops_l3_hit_retired.xsnp_hitm:pp (local socket)
> mem_load_uops_l3_miss_retired.remote_hitm:pp (remote socket)
>
> which gives you instructions that reference bouncing cache lines.
>
If I recall the c2c tool is giving you more than the bouncing line. It shows you
the offset inside the line and the participating CPUs.
next prev parent reply other threads:[~2015-12-09 17:15 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-09 4:06 [Questions] perf c2c: What's the current status of perf c2c? Yunlong Song
2015-12-09 8:04 ` Jiri Olsa
2015-12-09 8:12 ` Wangnan (F)
2015-12-09 9:11 ` Jiri Olsa
2015-12-09 9:34 ` Peter Zijlstra
2015-12-09 10:58 ` Peter Zijlstra
2015-12-09 11:09 ` Joe Mario
[not found] ` <1891297138.17374838.1449658964938.JavaMail.zimbra@redhat.com>
2015-12-09 14:03 ` Peter Zijlstra
2015-12-09 16:58 ` Andi Kleen
2015-12-09 17:15 ` Stephane Eranian [this message]
2015-12-09 17:21 ` Andi Kleen
2015-12-09 19:48 ` Stephane Eranian
2015-12-09 20:41 ` Joe Mario
2015-12-10 2:36 ` Yunlong Song
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