lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 17 May 2012 09:13:18 +0900 From: Namhyung Kim <namhyung.kim@....com> To: Peter Zijlstra <peterz@...radead.org> Cc: Ingo Molnar <mingo@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Arnaldo Carvalho de Melo <acme@...radead.org>, linux-kernel@...r.kernel.org, Arjan van de Ven <arjan@...radead.org>, David Ahern <dsahern@...il.com>, Frederic Weisbecker <fweisbec@...il.com>, Mike Galbraith <efault@....de>, Paul Mackerras <paulus@...ba.org>, Stephane Eranian <eranian@...gle.com>, arnaldo.melo@...il.com, Arnaldo Carvalho de Melo <acme@...hat.com> Subject: Re: [GIT PULL 0/8] Annotation weekly ponies delivery Hi, On Wed, 16 May 2012 14:57:49 +0900, Namhyung Kim wrote: > In fact, my perf stat -g was already broken - it cannot count at > all on my SNB box. I'll investigate it more. > It's like a matter of the number of the hw counters. The perf stat -g uses 6 hw events, but I can use up to 5 hw events on my SNB machine: $ ./perf stat -g -e cycles,cache-references,cache-misses,instructions,branches sleep 1 Performance counter stats for 'sleep 1': 999,008 cycles # 0.000 GHz 10,963 cache-references 2,630 cache-misses # 23.990 % of all cache refs 635,225 instructions # 0.64 insns per cycle 128,014 branches 1.001466421 seconds time elapsed But I adding branch-misses event outputs: Performance counter stats for 'sleep 1': <not counted> cycles <not counted> cache-references <not counted> cache-misses <not counted> instructions <not counted> branches <not counted> branch-misses 1.000742533 seconds time elapsed However adding ref-cycles is fine (Is it related to fixed counters?): Performance counter stats for 'sleep 1': 1,027,263 cycles # 0.000 GHz 12,435 cache-references 2,747 cache-misses # 22.091 % of all cache refs 650,100 instructions # 0.63 insns per cycle 130,765 branches 2,367,488 ref-cycles 1.001557088 seconds time elapsed BTW, dmesg says I have 7, but a counter was taken by NMI watchdog: $ dmesg | grep -A32 Performance [ 0.137227] Performance Events: PEBS fmt1+, 16-deep LBR, SandyBridge events, Intel PMU driver. [ 0.137232] ... version: 3 [ 0.137233] ... bit width: 48 [ 0.137234] ... generic registers: 4 [ 0.137235] ... value mask: 0000ffffffffffff [ 0.137236] ... max period: 000000007fffffff [ 0.137237] ... fixed-purpose events: 3 [ 0.137238] ... event mask: 000000070000000f [ 0.143371] NMI watchdog: enabled, takes one hw-pmu counter. [ 0.149251] Booting Node 0, Processors #1 [ 0.162396] NMI watchdog: enabled, takes one hw-pmu counter. [ 0.166265] #2 [ 0.179401] NMI watchdog: enabled, takes one hw-pmu counter. [ 0.183263] #3 [ 0.196399] NMI watchdog: enabled, takes one hw-pmu counter. [ 0.200263] #4 [ 0.213398] NMI watchdog: enabled, takes one hw-pmu counter. [ 0.217268] #5 [ 0.230404] NMI watchdog: enabled, takes one hw-pmu counter. [ 0.234263] #6 [ 0.247402] NMI watchdog: enabled, takes one hw-pmu counter. [ 0.251268] #7 [ 0.264405] NMI watchdog: enabled, takes one hw-pmu counter. [ 0.268266] #8 [ 0.281403] NMI watchdog: enabled, takes one hw-pmu counter. [ 0.285268] #9 [ 0.298405] NMI watchdog: enabled, takes one hw-pmu counter. [ 0.302264] #10 [ 0.315401] NMI watchdog: enabled, takes one hw-pmu counter. [ 0.319266] #11 Ok. [ 0.332404] NMI watchdog: enabled, takes one hw-pmu counter. [ 0.332435] Brought up 12 CPUs [ 0.332437] Total of 12 processors activated (76799.44 BogoMIPS). Thanks, Namhyung -- 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/
Powered by blists - more mailing lists