Messages in this thread | | | Date | Wed, 12 Jan 2011 15:42:43 +0100 | From | Frederic Weisbecker <> | Subject | Re: Q: perf log mode? |
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On Wed, Jan 12, 2011 at 03:08:08PM +0100, Peter Zijlstra wrote: > On Wed, 2011-01-12 at 17:06 +0300, Kirill Smelkov wrote: > > I'm trying to use perf together with e.g. kprobes as a tool to show what > > is happening with my system in "live-log" mode. The problem is, for > > seldom events, actual info output is largely delayed because perf reads > > sample data in whole pages. Could something be done with it or am I'm > > missing something? Here is detailed description: > > perf_event_attr = { > .watermark = 0, > .wakeup_events = 1, > };
Which is perhaps something we want as a default when perf record -c 1 and the output is the pipe mode.
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