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Date: Tue, 11 May 2010 17:03:40 +0800 From: Lin Ming <ming.m.lin@...el.com> To: Peter Zijlstra <peterz@...radead.org> Cc: Ingo Molnar <mingo@...e.hu>, Corey Ashford <cjashfor@...ux.vnet.ibm.com>, Frederic Weisbecker <fweisbec@...il.com>, "eranian@...il.com" <eranian@...il.com>, "Gary.Mohr@...l.com" <Gary.Mohr@...l.com>, "arjan@...ux.intel.com" <arjan@...ux.intel.com>, "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>, Paul Mackerras <paulus@...ba.org>, "David S. Miller" <davem@...emloft.net>, Russell King <rmk+kernel@....linux.org.uk>, Paul Mundt <lethal@...ux-sh.org>, lkml <linux-kernel@...r.kernel.org>, Arnaldo Carvalho de Melo <acme@...hat.com>, Will Deacon <will.deacon@....com>, Maynard Johnson <mpjohn@...ibm.com>, Carl Love <carll@...ibm.com> Subject: Re: [RFC][PATCH 3/9] perf: export registerred pmus via sysfs On Tue, 2010-05-11 at 16:50 +0800, Peter Zijlstra wrote: > On Tue, 2010-05-11 at 16:20 +0800, Lin Ming wrote: > > > How will this sysfs interface be used for userspace tool? > > > > /sys/devices/system/node/nodeN/node_events > > node_events/event_source_id > > > > node_events/local_misses/event_id > > /local_hits/event_id > > /remote_misses/event_id > > /remote_hits/event_id > > > > For example, to monitor node event local_misses on node 0, does it work > > as below? > > > > 1. perf top -e local_misses -n 0 (-n 0 means node 0) > > > > 2. read /sys/devices/system/node/node0/node_events/event_source_id to > > get the pmu_id > > > > 3. read /sys/devices/system/node/node0/node_events/local_misses/event_id > > to get the event_id > > > > 4. event_attr::pmu_id=pmu_id, event::config=event_id > > > > 5. other setting... > > > > 6. call syscall perf_event_open(....) > > No, you'll use event_source_id as perf_event_attr::type, use event_id as > perf_event_attr::config and then use a cpu-wide counter on a cpu > contained in node0. Is event_source_id a link to event_source class? For example, 2 event sources on Nehalem /sys/class/event_sources/core_pmu /sys/class/event_sources/uncore_pmu Then, /sys/devices/system/node/nodeN/node_events/event_source_id is a link to /sys/class/event_sources/uncore_pmu. /sys/devices/system/cpu/cpuN/cpu_hardware_events/event_source_id is a link to /sys/class/event_sources/core_pmu. And, the event_source_id #cat /sys/class/event_sources/core_pmu 0 #cat /sys/class/event_sources/uncore_pmu 1 -- 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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