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authorSteven Rostedt <rostedt@goodmis.org>2016-07-12 16:33:06 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-07-12 22:27:39 +0300
commit6d248fbda59c51ef5f2e90e11551d9e17aeb226f (patch)
tree46994b044d96741a2c4723a27e8a7f70487b4107 /tools/lib/traceevent
parent9881d7df9dddef24e34949a4510245e156746c21 (diff)
downloadlinux-6d248fbda59c51ef5f2e90e11551d9e17aeb226f.tar.xz
tools lib traceevent: Add filter on task CPU id
Add a 'CPU' special field to allow the filter in trace-cmd report to filter on the task's CPU. By adding a special field 'CPU' (all caps) the user can now filter out tasks based on which CPU they are on. This is useful when filtering out (or in) a bunch of threads. -F 'CPU == 0' Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/20160712093306.5b058103@gandalf.local.home Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/lib/traceevent')
-rw-r--r--tools/lib/traceevent/parse-filter.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
index 88cccea3ca99..7c214ceb9386 100644
--- a/tools/lib/traceevent/parse-filter.c
+++ b/tools/lib/traceevent/parse-filter.c
@@ -28,11 +28,16 @@
#include "event-utils.h"
#define COMM "COMM"
+#define CPU "CPU"
static struct format_field comm = {
.name = "COMM",
};
+static struct format_field cpu = {
+ .name = "CPU",
+};
+
struct event_list {
struct event_list *next;
struct event_format *event;
@@ -382,14 +387,17 @@ create_arg_item(struct event_format *event, const char *token,
/* Consider this a field */
field = pevent_find_any_field(event, token);
if (!field) {
- if (strcmp(token, COMM) != 0) {
+ /* If token is 'COMM' or 'CPU' then it is special */
+ if (strcmp(token, COMM) == 0) {
+ field = &comm;
+ } else if (strcmp(token, CPU) == 0) {
+ field = &cpu;
+ } else {
/* not a field, Make it false */
arg->type = FILTER_ARG_BOOLEAN;
arg->boolean.value = FILTER_FALSE;
break;
}
- /* If token is 'COMM' then it is special */
- field = &comm;
}
arg->type = FILTER_ARG_FIELD;
arg->field.field = field;
@@ -1718,6 +1726,10 @@ get_value(struct event_format *event,
return (unsigned long)name;
}
+ /* Handle our dummy "cpu" field */
+ if (field == &cpu)
+ return record->cpu;
+
pevent_read_number_field(field, record->data, &val);
if (!(field->flags & FIELD_IS_SIGNED))