perf trace: Add filter Suppport

Add a new option "--filter <filter_str>" to perf record, and
it should be right after "-e trace_point":

 #./perf record -R -f -e irq:irq_handler_entry --filter irq==18
 ^C
 # ./perf trace
            perf-4303  ... irq_handler_entry: irq=18 handler=eth0
            init-0     ... irq_handler_entry: irq=18 handler=eth0
            init-0     ... irq_handler_entry: irq=18 handler=eth0
            init-0     ... irq_handler_entry: irq=18 handler=eth0
            init-0     ... irq_handler_entry: irq=18 handler=eth0

See Documentation/trace/events.txt for the syntax of filter
expressions.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <4AD6955F.90602@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 40 insertions, 3 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 4e3a374e7aa7..8b2c860c49a2 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -374,9 +374,11 @@ static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int n
 
 static void create_counter(int counter, int cpu, pid_t pid)
 {
+        char *filter = filters[counter];
         struct perf_event_attr *attr = attrs + counter;
         struct perf_header_attr *h_attr;
         int track = !counter; /* only the first counter needs these */
+        int ret;
         struct {
                 u64 count;
                 u64 time_enabled;
@@ -479,7 +481,6 @@ try_again:
                 multiplex_fd = fd[nr_cpu][counter];
 
         if (multiplex && fd[nr_cpu][counter] != multiplex_fd) {
-                int ret;
 
                 ret = ioctl(fd[nr_cpu][counter], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd);
                 assert(ret != -1);
@@ -499,6 +500,16 @@ try_again:
                 }
         }
 
+        if (filter != NULL) {
+                ret = ioctl(fd[nr_cpu][counter],
+                            PERF_EVENT_IOC_SET_FILTER, filter);
+                if (ret) {
+                        error("failed to set filter with %d (%s)\n", errno,
+                              strerror(errno));
+                        exit(-1);
+                }
+        }
+
         ioctl(fd[nr_cpu][counter], PERF_EVENT_IOC_ENABLE);
 }
 
@@ -676,6 +687,8 @@ static const struct option options[] = {
         OPT_CALLBACK('e', "event", NULL, "event",
                      "event selector. use 'perf list' to list available events",
                      parse_events),
+        OPT_CALLBACK(0, "filter", NULL, "filter",
+                     "event filter", parse_filter),
         OPT_INTEGER('p', "pid", &target_pid,
                     "record events on existing pid"),
         OPT_INTEGER('r', "realtime", &realtime_prio,
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 8cfb48cbbea0..b097570e9623 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -8,9 +8,10 @@
 #include "cache.h"
 #include "header.h"
 
-int                                     nr_counters;
+int                             nr_counters;
 
 struct perf_event_attr          attrs[MAX_COUNTERS];
+char                            *filters[MAX_COUNTERS];
 
 struct event_symbol {
         u8              type;
@@ -708,7 +709,6 @@ static void store_event_type(const char *orgname)
         perf_header__push_event(id, orgname);
 }
 
-
 int parse_events(const struct option *opt __used, const char *str, int unset __used)
 {
         struct perf_event_attr attr;
@@ -745,6 +745,28 @@ int parse_events(const struct option *opt __used, const char *str, int unset __u
         return 0;
 }
 
+int parse_filter(const struct option *opt __used, const char *str,
+                 int unset __used)
+{
+        int i = nr_counters - 1;
+        int len = strlen(str);
+
+        if (i < 0 || attrs[i].type != PERF_TYPE_TRACEPOINT) {
+                fprintf(stderr,
+                        "-F option should follow a -e tracepoint option\n");
+                return -1;
+        }
+
+        filters[i] = malloc(len + 1);
+        if (!filters[i]) {
+                fprintf(stderr, "not enough memory to hold filter string\n");
+                return -1;
+        }
+        strcpy(filters[i], str);
+
+        return 0;
+}
+
 static const char * const event_type_descriptors[] = {
         "",
         "Hardware event",
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 8626a439033d..b8c1f64bc935 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -17,11 +17,13 @@ extern struct tracepoint_path *tracepoint_id_to_path(u64 config);
 extern int                      nr_counters;
 
 extern struct perf_event_attr attrs[MAX_COUNTERS];
+extern char *filters[MAX_COUNTERS];
 
 extern const char *event_name(int ctr);
 extern const char *__event_name(int type, u64 config);
 
 extern int parse_events(const struct option *opt, const char *str, int unset);
+extern int parse_filter(const struct option *opt, const char *str, int unset);
 
 #define EVENTS_HELP_MAX (128*1024)