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Message-ID: <20101022025245.GJ23835@ghostprotocols.net> Date: Fri, 22 Oct 2010 00:52:45 -0200 From: Arnaldo Carvalho de Melo <acme@...radead.org> To: Luming Yu <luming.yu@...il.com> Cc: LKML <linux-kernel@...r.kernel.org> Subject: Re: why could cause PerfTop get nothing output ? Em Sat, Oct 09, 2010 at 05:07:42AM -0400, Luming Yu escreveu: > Hi acme, > > I got nothing output as below, wondering if it was due to too few interrupts ? Try using a higher frequency: perf top -F 100000 > Is it possbile to get perf top based on samples from other Perf events? Yes, any event, just specify it like: perf top -e instructions - Arnaldo > [root@...alhost clocksource0]# rpm -qa | grep perf > perf-2.6.36-0.35.rc7.git0.fc15.x86_64 > [root@...alhost clocksource0]# uname -a > Linux localhost.localdomain 2.6.36-0.35.rc7.git0.fc15.x86_64 #1 SMP > Wed Oct 6 22:02:54 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux > [root@...alhost clocksource0]# perf top > > ------------------------------------------------------------------------------- > PerfTop: 0 irqs/sec kernel:-nan% exact: -nan% [1000Hz > cycles], (all, 2 CPUs) > ------------------------------------------------------------------------------- > > samples pcnt DSO > _______ _____ -- 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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