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Message-ID: <AANLkTikpFW_fqc6nTMspwBGZRMe1PMWVFD+aRQAab0LF@mail.gmail.com> Date: Wed, 3 Nov 2010 18:15:10 -0400 From: Reid Kleckner <reid.kleckner@...il.com> To: Frederic Weisbecker <fweisbec@...il.com> Cc: Francis Moreau <francis.moro@...il.com>, linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Arnaldo Carvalho de Melo <acme@...hat.com>, Stephane Eranian <eranian@...gle.com>, linux-perf-users@...r.kernel.org Subject: Re: perf tools miscellaneous questions On Wed, Nov 3, 2010 at 5:43 PM, Frederic Weisbecker <fweisbec@...il.com> wrote: >> What's exactly the 'cache-misses' event ? does it include both instructions >> _and_ data cache misses ? both L1 and L2 caches ? >> >> I was expecting so but the following command makes me wondering: >> >> $ perf stat -e cache-misses:u,l1d-loads-misses:u true >> Performance counter stats for 'true': >> >> 763 cache-misses >> 874 L1-dcache-load-misses >> >> 0.000916609 seconds time elapsed >> >> Here cache-misses < L1-dcache-load-misses. > > > > Dunno, will let others answer. I think it corresponds to last level cache misses, which makes sense here. The difference in the two numbers represents hits to L2 (and L3 if it exists). Reid -- 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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