Messages in this thread |  | | Date | Mon, 18 Nov 2013 19:17:37 -0700 | From | David Ahern <> | Subject | Re: [PATCH 4/5] perf record: mmap output file - v5 |
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On 11/18/13, 7:13 PM, Namhyung Kim wrote: > I think it should be > > perf record -e cycles -F 4000 -e faults -c 1 --call-graph dwarf,8192 -a -- sleep 1 > > (at least to generate the feedback spiral more efficiently..)
you don't need the cycles. faults by itself works. Each event contains > 2 pages of data in the sample. With mmap-based output a single sample (1 page fault in any process) generates 2-3 page faults by perf which cause 2-3 >8k samples to be generated, which generates faults, ....
David
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