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perf: add perf-inject builtin

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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>
This commit is contained in:
Tom Zanussi 2010-05-01 01:41:20 -05:00 • committed by Arnaldo Carvalho de Melo
parent 789688faef
commit 454c407ec1
20 changed files with 293 additions and 24 deletions
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3
tools/perf/util/session.h
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@ -34,6 +34,7 @@ struct perf_session {
u64 sample_type;
int fd;
bool fd_pipe;
bool repipe;
int cwdlen;
char *cwd;
struct ordered_samples ordered_samples;
@ -59,7 +60,7 @@ struct perf_event_ops {
bool ordered_samples;
};
struct perf_session *perf_session__new(const char *filename, int mode, bool force);
struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe);
void perf_session__delete(struct perf_session *self);
void perf_event_header__bswap(struct perf_event_header *self);