lkml.org 
[lkml]   [2014]   [Oct]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/3] perf script perl: Removing event cache as it's no longer needed
Date
We don't need to maintain cache of 'struct event_format'
objects. Currently the 'struct perf_evsel' holds this
reference already.

Adding events_defined bitmap to keep track of defined events,
which is much cheaper than array of pointers.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
.../perf/util/scripting-engines/trace-event-perl.c | 29 +++++-----------------
1 file changed, 6 insertions(+), 23 deletions(-)

diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c
index 0a01bac4ce02..22ebc46226e7 100644
--- a/tools/perf/util/scripting-engines/trace-event-perl.c
+++ b/tools/perf/util/scripting-engines/trace-event-perl.c
@@ -24,6 +24,7 @@
#include <string.h>
#include <ctype.h>
#include <errno.h>
+#include <linux/bitmap.h>

#include "../util.h"
#include <EXTERN.h>
@@ -57,7 +58,7 @@ INTERP my_perl;
#define FTRACE_MAX_EVENT \
((1 << (sizeof(unsigned short) * 8)) - 1)

-struct event_format *events[FTRACE_MAX_EVENT];
+static DECLARE_BITMAP(events_defined, FTRACE_MAX_EVENT);

extern struct scripting_context *scripting_context;

@@ -238,35 +239,15 @@ static void define_event_symbols(struct event_format *event,
define_event_symbols(event, ev_name, args->next);
}

-static inline struct event_format *find_cache_event(struct perf_evsel *evsel)
-{
- static char ev_name[256];
- struct event_format *event;
- int type = evsel->attr.config;
-
- if (events[type])
- return events[type];
-
- events[type] = event = evsel->tp_format;
- if (!event)
- return NULL;
-
- sprintf(ev_name, "%s::%s", event->system, event->name);
-
- define_event_symbols(event, ev_name, event->print_fmt.args);
-
- return event;
-}
-
static void perl_process_tracepoint(struct perf_sample *sample,
struct perf_evsel *evsel,
struct thread *thread)
{
+ struct event_format *event = evsel->tp_format;
struct format_field *field;
static char handler[256];
unsigned long long val;
unsigned long s, ns;
- struct event_format *event;
int pid;
int cpu = sample->cpu;
void *data = sample->raw_data;
@@ -278,7 +259,6 @@ static void perl_process_tracepoint(struct perf_sample *sample,
if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
return;

- event = find_cache_event(evsel);
if (!event)
die("ug! no event found for type %" PRIu64, (u64)evsel->attr.config);

@@ -286,6 +266,9 @@ static void perl_process_tracepoint(struct perf_sample *sample,

sprintf(handler, "%s::%s", event->system, event->name);

+ if (!test_and_set_bit(event->id, events_defined))
+ define_event_symbols(event, handler, event->print_fmt.args);
+
s = nsecs / NSECS_PER_SEC;
ns = nsecs - s * NSECS_PER_SEC;

--
1.9.3


\
 
 \ /
  Last update: 2014-10-27 00:21    [W:0.057 / U:1.500 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site