mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 09:59:32 +00:00
![Tom Zanussi](/assets/img/avatar_default.png)
Currently, perf 'live mode' writes build-ids at the end of the session, which isn't actually useful for processing live mode events. What would be better would be to have the build-ids sent before any of the samples that reference them, which can be done by processing the event stream and retrieving the build-ids on the first hit. Doing that in perf-record itself, however, is off-limits. This patch introduces perf-inject, which does the same job while leaving perf-record untouched. Normal mode perf still records the build-ids at the end of the session as it should, but for live mode, perf-inject can be injected in between the record and report steps e.g.: perf record -o - ./hackbench 10 | perf inject -v -b | perf report -v -i - perf-inject reads a perf-record event stream and repipes it to stdout. At any point the processing code can inject other events into the event stream - in this case build-ids (-b option) are read and injected as needed into the event stream. Build-ids are just the first user of perf-inject - potentially anything that needs userspace processing to augment the trace stream with additional information could make use of this facility. Cc: Ingo Molnar <mingo@elte.hu> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frédéric Weisbecker <fweisbec@gmail.com> LKML-Reference: <1272696080-16435-3-git-send-email-tzanussi@gmail.com> Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
|
|
* builtin-buildid-list.c
|
|
*
|
|
* Builtin buildid-list command: list buildids in perf.data
|
|
*
|
|
* Copyright (C) 2009, Red Hat Inc.
|
|
* Copyright (C) 2009, Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
*/
|
|
#include "builtin.h"
|
|
#include "perf.h"
|
|
#include "util/build-id.h"
|
|
#include "util/cache.h"
|
|
#include "util/debug.h"
|
|
#include "util/parse-options.h"
|
|
#include "util/session.h"
|
|
#include "util/symbol.h"
|
|
|
|
static char const *input_name = "perf.data";
|
|
static bool force;
|
|
static bool with_hits;
|
|
|
|
static const char * const buildid_list_usage[] = {
|
|
"perf buildid-list [<options>]",
|
|
NULL
|
|
};
|
|
|
|
static const struct option options[] = {
|
|
OPT_BOOLEAN('H', "with-hits", &with_hits, "Show only DSOs with hits"),
|
|
OPT_STRING('i', "input", &input_name, "file",
|
|
"input file name"),
|
|
OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
|
|
OPT_INCR('v', "verbose", &verbose,
|
|
"be more verbose"),
|
|
OPT_END()
|
|
};
|
|
|
|
static int __cmd_buildid_list(void)
|
|
{
|
|
int err = -1;
|
|
struct perf_session *session;
|
|
|
|
session = perf_session__new(input_name, O_RDONLY, force, false);
|
|
if (session == NULL)
|
|
return -1;
|
|
|
|
if (with_hits)
|
|
perf_session__process_events(session, &build_id__mark_dso_hit_ops);
|
|
|
|
perf_session__fprintf_dsos_buildid(session, stdout, with_hits);
|
|
|
|
perf_session__delete(session);
|
|
return err;
|
|
}
|
|
|
|
int cmd_buildid_list(int argc, const char **argv, const char *prefix __used)
|
|
{
|
|
argc = parse_options(argc, argv, options, buildid_list_usage, 0);
|
|
setup_pager();
|
|
return __cmd_buildid_list();
|
|
}
|