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perf auxtrace: Add Z itrace option for timeless decoding

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Issues correlating timestamps can be avoided with timeless decoding. Add
an option for that, so that timeless decoding can be used even when
timestamps are present.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20210430070309.17624-2-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2021-04-30 10:02:58 +03:00 committed by Arnaldo Carvalho de Melo
parent 88b06399c9
commit 18f4949427
3 changed files with 6 additions and 0 deletions
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1
tools/perf/Documentation/itrace.txt
View file

@ -20,6 +20,7 @@
L synthesize last branch entries on existing event records
s skip initial number of events
q quicker (less detailed) decoding
Z prefer to ignore timestamps (so-called "timeless" decoding)
The default is all events i.e. the same as --itrace=ibxwpe,
except for perf script where it is --itrace=ce

3
tools/perf/util/auxtrace.c
View file

@ -1569,6 +1569,9 @@ int itrace_parse_synth_opts(const struct option *opt, const char *str,
case 'q':
synth_opts->quick += 1;
break;
case 'Z':
synth_opts->timeless_decoding = true;
break;
case ' ':
case ',':
break;

2
tools/perf/util/auxtrace.h
View file

@ -89,6 +89,7 @@ enum itrace_period_type {
* @tlb: whether to synthesize TLB events
* @remote_access: whether to synthesize remote access events
* @mem: whether to synthesize memory events
* @timeless_decoding: prefer "timeless" decoding i.e. ignore timestamps
* @callchain_sz: maximum callchain size
* @last_branch_sz: branch context size
* @period: 'instructions' events period
@ -128,6 +129,7 @@ struct itrace_synth_opts {
bool tlb;
bool remote_access;
bool mem;
bool timeless_decoding;
unsigned int callchain_sz;
unsigned int last_branch_sz;
unsigned long long period;