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Commit 6d248fbd authored by Steven Rostedt's avatar Steven Rostedt Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarSteven 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 9881d7df

tools/lib/traceevent/parse-filter.c

+15 −3
Original line number Diff line number Diff line
@@ -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))