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Date: Thu, 21 Jan 2010 10:22:25 -0200 From: Arnaldo Carvalho de Melo <acme@...hat.com> To: Mike Galbraith <efault@....de> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>, LKML <linux-kernel@...r.kernel.org> Subject: Re: perf top: losing events? Em Thu, Jan 21, 2010 at 06:42:08AM +0100, Mike Galbraith escreveu: > Greetings Arnaldo, > > ------------------------------------------------------------------------------------------------------------------------------ > PerfTop: 670 irqs/sec kernel:14.6% [1000Hz cycles], (all, cpu: 3) > ------------------------------------------------------------------------------------------------------------------------------ > > samples pcnt function DSO > _______ _____ ___________________ ________________________________________________________________ > > 12535.00 82.1% main /root/bin/pert > 302.00 2.0% clear_page_c [kernel.kallsyms] > 169.00 1.1% _int_malloc /lib64/libc-2.9.so > 168.00 1.1% page_fault [kernel.kallsyms] > 138.00 0.9% yylex /usr/local/src/kernel/linux-2.6.33.git/scripts/genksyms/genksyms > 121.00 0.8% __GI_memset /lib64/libc-2.9.so > 117.00 0.8% copy_page_c [kernel.kallsyms] > 96.00 0.6% _raw_spin_lock [kernel.kallsyms] > 79.00 0.5% use_config /usr/local/src/kernel/linux-2.6.33.git/scripts/basic/fixdep > > If only 100% userland hog (pert) is running, I see the expected 1KHz > irqs/sec. As soon as I start a kbuild with it, irqs/sec drops, though > NMIs are indeed happening at 1KHz. > > Bisection points to 5b2bb75 perf top: Support userspace symbols too. Can you check if this one helps? - Arnaldo diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index 7a8a77e..8b04988 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -934,8 +934,11 @@ static void event__process_sample(const event_t *self, struct addr_location al; u8 origin = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; + ++samples; + switch (origin) { case PERF_RECORD_MISC_USER: + ++userspace_samples; if (hide_user_symbols) return; break; @@ -960,9 +963,6 @@ static void event__process_sample(const event_t *self, if (list_empty(&syme->node) || !syme->node.next) __list_insert_active_sym(syme); pthread_mutex_unlock(&active_symbols_lock); - if (origin == PERF_RECORD_MISC_USER) - ++userspace_samples; - ++samples; } } -- 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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