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Date: Wed, 11 Sep 2013 18:55:28 +0200 From: Stephane Eranian <eranian@...gle.com> To: Andi Kleen <ak@...ux.intel.com> Cc: LKML <linux-kernel@...r.kernel.org>, Peter Zijlstra <peterz@...radead.org>, "mingo@...e.hu" <mingo@...e.hu>, "Yan, Zheng" <zheng.z.yan@...el.com>, David Sharp <dhsharp@...gle.com> Subject: Re: [PATCH] perf,x86: add constraint for IVB CYCLE_ACTIVITY:CYCLES_LDM_PENDING On Wed, Sep 11, 2013 at 6:50 PM, Andi Kleen <ak@...ux.intel.com> wrote: > On Wed, Sep 11, 2013 at 08:22:22AM -0700, Stephane Eranian wrote: >> >> The IvyBridge event CYCLE_ACTIVITY:CYCLES_LDM_PENDING can only >> be measured on counters 0-3 when HT is off. When HT is on, you >> only have counters 0-3. >> >> If you program it on the eight counters for 1s on a 3GHz >> IVB laptop running a noploop, you see: >> >> 2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING >> 2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING >> 2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING >> 2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING >> 3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING >> 3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING >> 3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING >> 3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING >> >> Clearly the last 4 values are bogus. > > Thanks looks good. > > Likely need it on Haswell too? > Will check on that one later this week. But I think you are right. > -Andi -- 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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