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Date: Wed, 9 Dec 2015 09:15:04 -0800 From: Stephane Eranian <eranian@...gle.com> To: Andi Kleen <andi@...stfloor.org> Cc: Peter Zijlstra <peterz@...radead.org>, Jiri Olsa <jolsa@...hat.com>, Yunlong Song <yunlong.song@...wei.com>, Don Zickus <dzickus@...hat.com>, David Ahern <dsahern@...il.com>, Frédéric Weisbecker <fweisbec@...il.com>, Joe Mario <jmario@...hat.com>, Mike Galbraith <efault@....de>, Paul Mackerras <paulus@...ba.org>, Richard Fowles <rfowles@...hat.com>, "acme@...nel.org >> Arnaldo Carvalho de Melo" <acme@...nel.org>, "mingo@...hat.com" <mingo@...hat.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Jiri Olsa <jolsa@...nel.org>, "wangnan0@...wei.com >> Wang Nan" <wangnan0@...wei.com>, Richard Fowles <fowles@...each.com>, Namhyung Kim <namhyung@...nel.org> Subject: Re: [Questions] perf c2c: What's the current status of perf c2c? Hi, On Wed, Dec 9, 2015 at 8:58 AM, Andi Kleen <andi@...stfloor.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. -- 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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