From: Andi Kleen <a...@linux.intel.com>
Add a precise qualifier, like cpu/event=0x3c,precise=1/
This is needed so that the kernel can request enabling PEBS
on specific events. This is useful for mem-loads/mem-stores
Currently you have to known that mem-loads is a PEBS event
and use
perf record -e cpu/mem-loads/p ...
With this patch we can export the PEBSness of events in sysfs and
then allow
perf record -e cpu/mem-loads/ ...
or with the additional patch to automatically add cpu//
perf record -e mem-loads ...
Also useful for some other events added in later patches.
v2: Allow 3 as value
Signed-off-by: Andi Kleen <a...@linux.intel.com>
---
tools/perf/util/parse-events.c | 6 ++++++
tools/perf/util/parse-events.h | 1 +
tools/perf/util/parse-events.l | 1 +
3 files changed, 8 insertions(+)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 995fc25..34f1470 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -568,6 +568,12 @@ do {
\
case PARSE_EVENTS__TERM_TYPE_NAME:
CHECK_TYPE_VAL(STR);
break;
+ case PARSE_EVENTS__TERM_TYPE_PRECISE:
+ CHECK_TYPE_VAL(NUM);
+ if ((unsigned)term->val.num > 3)
+ return -EINVAL;
+ attr->precise_ip = term->val.num;
+ break;
default:
return -EINVAL;
}
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 8a48593..13d7c66 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -48,6 +48,7 @@ enum {
PARSE_EVENTS__TERM_TYPE_NAME,
PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD,
PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE,
+ PARSE_EVENTS__TERM_TYPE_PRECISE,
};
struct parse_events_term {
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index e9d1134..32a9000 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -169,6 +169,7 @@ period { return term(yyscanner,
PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD); }
branch_type { return term(yyscanner,
PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE); }
, { return ','; }
"/" { BEGIN(INITIAL); return '/'; }
+precise { return term(yyscanner,
PARSE_EVENTS__TERM_TYPE_PRECISE); }
{name_minus} { return str(yyscanner, PE_NAME); }
}
--
1.8.1.4
--
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