Commit b6778fe1 authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
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perf auxtrace: Add itrace A option to approximate IPC 



Add an option to specify that synthesized IPC can be approximate, rather
than completely accurate.

Reviewed-by: default avatarAndi Kleen <ak@linux.intel.com>
Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20211027080334.365596-3-adrian.hunter@intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent cf14013b

tools/perf/Documentation/itrace.txt

+1 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
		L	synthesize last branch entries on existing event records

		s       skip initial number of events

		q	quicker (less detailed) decoding

		A	approximate IPC

		Z	prefer to ignore timestamps (so-called "timeless" decoding)



	The default is all events i.e. the same as --itrace=ibxwpe,

tools/perf/util/auxtrace.c

+3 −0
Original line number Diff line number Diff line
@@ -1564,6 +1564,9 @@ int itrace_do_parse_synth_opts(struct itrace_synth_opts *synth_opts, 
		case 'q':

			synth_opts->quick += 1;

			break;

		case 'A':

			synth_opts->approx_ipc = true;

			break;

		case 'Z':

			synth_opts->timeless_decoding = true;

			break;

tools/perf/util/auxtrace.h

+3 −0
Original line number Diff line number Diff line
@@ -84,6 +84,7 @@ enum itrace_period_type { 
 * @thread_stack: feed branches to the thread_stack

 * @last_branch: add branch context to 'instruction' events

 * @add_last_branch: add branch context to existing event records

 * @approx_ipc: approximate IPC

 * @flc: whether to synthesize first level cache events

 * @llc: whether to synthesize last level cache events

 * @tlb: whether to synthesize TLB events
@@ -127,6 +128,7 @@ struct itrace_synth_opts { 
	bool			thread_stack;

	bool			last_branch;

	bool			add_last_branch;

	bool			approx_ipc;

	bool			flc;

	bool			llc;

	bool			tlb;
@@ -649,6 +651,7 @@ bool auxtrace__evsel_is_auxtrace(struct perf_session *session, 
"				L[len]:			synthesize last branch entries on existing event records\n" \

"				sNUMBER:    		skip initial number of events\n"		\

"				q:			quicker (less detailed) decoding\n" \

"				A:			approximate IPC\n" \

"				Z:			prefer to ignore timestamps (so-called \"timeless\" decoding)\n" \

"				PERIOD[ns|us|ms|i|t]:   specify period to sample stream\n" \

"				concatenate multiple options. Default is ibxwpe or cewp\n"