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tools lib traceevent: Add filter on task CPU id

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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>
This commit is contained in:
Steven Rostedt 2016-07-12 09:33:06 -04:00 committed by Arnaldo Carvalho de Melo
parent 9881d7df9d
commit 6d248fbda5
1 changed files with 15 additions and 3 deletions
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18
tools/lib/traceevent/parse-filter.c
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@ -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))