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perf list: Add explanation about raw hardware event descriptors
Using explanation given by Ingo Molnar in the oprofile mailing list. Suggested-by: Nick Black <dank@qemfd.net> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Nick Black <dank@qemfd.net> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -15,6 +15,24 @@ DESCRIPTION
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This command displays the symbolic event types which can be selected in the
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This command displays the symbolic event types which can be selected in the
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various perf commands with the -e option.
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various perf commands with the -e option.
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RAW HARDWARE EVENT DESCRIPTOR
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-----------------------------
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Even when an event is not available in a symbolic form within perf right now,
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it can be encoded as <UMASK VALUE><EVENT NUM>, for instance, if the Intel docs
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describe an event as:
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Event Umask Event Mask
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Num. Value Mnemonic Description Comment
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A8H 01H LSD.UOPS Counts the number of micro-ops Use cmask=1 and
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delivered by loop stream detector invert to count
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cycles
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raw encoding of 0x1A8 can be used:
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perf stat -e r1a8 -a sleep 1
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perf record -e r1a8 ...
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OPTIONS
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OPTIONS
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-------
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-------
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None
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None
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@ -936,7 +936,7 @@ void print_events(void)
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printf("\n");
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printf("\n");
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printf(" %-42s [%s]\n",
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printf(" %-42s [%s]\n",
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"rNNN", event_type_descriptors[PERF_TYPE_RAW]);
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"rNNN (NNN=<UMASK VALUE><EVENT NUM>)", event_type_descriptors[PERF_TYPE_RAW]);
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printf("\n");
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printf("\n");
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printf(" %-42s [%s]\n",
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printf(" %-42s [%s]\n",
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