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perf intel-pt: Improve man page layout slightly
Improve man page layout slightly by adding blank lines. Reviewed-by: Andi Kleen <ak@linux.intel.com> Reviewed-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Link: https://lore.kernel.org/r/20220905073424.3971-4-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -943,12 +943,15 @@ event packets are recorded only if the "pwr_evt" config term was used. Refer to
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the config terms section above. The power events record information about
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C-state changes, whereas CBR is indicative of CPU frequency. perf script
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"event,synth" fields display information like this:
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cbr: cbr: 22 freq: 2189 MHz (200%)
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mwait: hints: 0x60 extensions: 0x1
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pwre: hw: 0 cstate: 2 sub-cstate: 0
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exstop: ip: 1
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pwrx: deepest cstate: 2 last cstate: 2 wake reason: 0x4
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Where:
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"cbr" includes the frequency and the percentage of maximum non-turbo
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"mwait" shows mwait hints and extensions
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"pwre" shows C-state transitions (to a C-state deeper than C0) and
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@ -956,6 +959,7 @@ Where:
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"exstop" indicates execution stopped and whether the IP was recorded
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exactly,
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"pwrx" indicates return to C0
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For more details refer to the Intel 64 and IA-32 Architectures Software
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Developer Manuals.
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@ -969,8 +973,10 @@ are quite important. Users must know if what they are seeing is a complete
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picture or not. The "e" option may be followed by flags which affect what errors
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will or will not be reported. Each flag must be preceded by either '+' or '-'.
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The flags supported by Intel PT are:
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-o Suppress overflow errors
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-l Suppress trace data lost errors
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For example, for errors but not overflow or data lost errors:
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--itrace=e-o-l
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@ -980,9 +986,11 @@ decoded packets and instructions. Note that this option slows down the decoder
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and that the resulting file may be very large. The "d" option may be followed
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by flags which affect what debug messages will or will not be logged. Each flag
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must be preceded by either '+' or '-'. The flags support by Intel PT are:
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-a Suppress logging of perf events
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+a Log all perf events
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+o Output to stdout instead of "intel_pt.log"
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By default, logged perf events are filtered by any specified time ranges, but
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flag +a overrides that.
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