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| author | Andi Kleen <ak@linux.intel.com> | 2019-03-26 15:18:21 -0700 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-04-01 14:49:24 -0300 |
| commit | f0fbb114e3025f3f737a1e1c5c39c5b2b2e671bd (patch) | |
| tree | 457cc78618f7a4627d37e436d1cef2cbdf9a21d7 /tools/perf/util/parse-events.y | |
| parent | c2b3c170db610896e4e633cba2135045333811c2 (diff) | |
| download | lwn-f0fbb114e3025f3f737a1e1c5c39c5b2b2e671bd.tar.gz lwn-f0fbb114e3025f3f737a1e1c5c39c5b2b2e671bd.zip | |
perf stat: Implement duration_time as a proper event
The perf metric expression use 'duration_time' internally to normalize
events. Normal 'perf stat' without -x also prints the duration time.
But when using -x, the interval is not output anywhere, which is
inconvenient for any post processing which often wants to normalize
values to time.
So implement 'duration_time' as a proper perf event that can be
specified explicitely with -e.
The previous implementation of 'duration_time' only worked for metric
processing. This adds the concept of a tool event that is handled by the
tool. On the kernel level it is still mapped to the dummy software
event, but the values are not read anymore, but instead computed by the
tool.
Add proper plumbing to handle this in the event parser, and display it
in 'perf stat'. We don't want 'duration_time' to be added up, so it's
only printed for the first CPU.
% perf stat -e duration_time,cycles true
Performance counter stats for 'true':
555,476 ns duration_time
771,958 cycles
0.000555476 seconds time elapsed
0.000644000 seconds user
0.000000000 seconds sys
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20190326221823.11518-3-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/parse-events.y')
| -rw-r--r-- | tools/perf/util/parse-events.y | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index 44819bdb037d..6ad8d4914969 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -14,6 +14,7 @@ #include <linux/types.h> #include "util.h" #include "pmu.h" +#include "evsel.h" #include "debug.h" #include "parse-events.h" #include "parse-events-bison.h" @@ -45,6 +46,7 @@ static void inc_group_count(struct list_head *list, %token PE_START_EVENTS PE_START_TERMS %token PE_VALUE PE_VALUE_SYM_HW PE_VALUE_SYM_SW PE_RAW PE_TERM +%token PE_VALUE_SYM_TOOL %token PE_EVENT_NAME %token PE_NAME %token PE_BPF_OBJECT PE_BPF_SOURCE @@ -58,6 +60,7 @@ static void inc_group_count(struct list_head *list, %type <num> PE_VALUE %type <num> PE_VALUE_SYM_HW %type <num> PE_VALUE_SYM_SW +%type <num> PE_VALUE_SYM_TOOL %type <num> PE_RAW %type <num> PE_TERM %type <str> PE_NAME @@ -321,6 +324,15 @@ value_sym sep_slash_slash_dc ABORT_ON(parse_events_add_numeric(_parse_state, list, type, config, NULL)); $$ = list; } +| +PE_VALUE_SYM_TOOL sep_slash_slash_dc +{ + struct list_head *list; + + ALLOC_LIST(list); + ABORT_ON(parse_events_add_tool(_parse_state, list, $1)); + $$ = list; +} event_legacy_cache: PE_NAME_CACHE_TYPE '-' PE_NAME_CACHE_OP_RESULT '-' PE_NAME_CACHE_OP_RESULT opt_event_config |