From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754461AbaHMWvN (ORCPT ); Wed, 13 Aug 2014 18:51:13 -0400 Received: from mail.kernel.org ([198.145.19.201]:55662 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754436AbaHMWvJ (ORCPT ); Wed, 13 Aug 2014 18:51:09 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Adrian Hunter , David Ahern , Frederic Weisbecker , Jiri Olsa , Namhyung Kim , Paul Mackerras , Peter Zijlstra , Stephane Eranian , Arnaldo Carvalho de Melo Subject: [PATCH 35/41] perf session: Add perf_session__peek_event() Date: Wed, 13 Aug 2014 19:48:21 -0300 Message-Id: <1407970107-24540-36-git-send-email-acme@kernel.org> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1407970107-24540-1-git-send-email-acme@kernel.org> References: <1407970107-24540-1-git-send-email-acme@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Adrian Hunter Add a function to peek at other events in the event stream. Signed-off-by: Adrian Hunter Cc: David Ahern Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/r/1406786474-9306-15-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/session.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++ tools/perf/util/session.h | 5 +++++ 2 files changed, 60 insertions(+) diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 7e27f1eb260c..1b383bd93af6 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -897,6 +897,61 @@ static void event_swap(union perf_event *event, bool sample_id_all) swap(event, sample_id_all); } +int perf_session__peek_event(struct perf_session *session, off_t file_offset, + void *buf, size_t buf_sz, + union perf_event **event_ptr, + struct perf_sample *sample) +{ + union perf_event *event; + size_t hdr_sz, rest; + int fd; + + if (session->one_mmap && !session->header.needs_swap) { + event = file_offset - session->one_mmap_offset + + session->one_mmap_addr; + goto out_parse_sample; + } + + if (perf_data_file__is_pipe(session->file)) + return -1; + + fd = perf_data_file__fd(session->file); + hdr_sz = sizeof(struct perf_event_header); + + if (buf_sz < hdr_sz) + return -1; + + if (lseek(fd, file_offset, SEEK_SET) == (off_t)-1 || + readn(fd, &buf, hdr_sz) != (ssize_t)hdr_sz) + return -1; + + event = (union perf_event *)buf; + + if (session->header.needs_swap) + perf_event_header__bswap(&event->header); + + if (event->header.size < hdr_sz) + return -1; + + rest = event->header.size - hdr_sz; + + if (readn(fd, &buf, rest) != (ssize_t)rest) + return -1; + + if (session->header.needs_swap) + event_swap(event, perf_evlist__sample_id_all(session->evlist)); + +out_parse_sample: + + if (sample && event->header.type < PERF_RECORD_USER_TYPE_START && + perf_evlist__parse_sample(session->evlist, event, sample)) + return -1; + + *event_ptr = event; + + return 0; +} + static s64 perf_session__process_event(struct perf_session *session, union perf_event *event, struct perf_tool *tool, diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h index 0630e658f8be..8dd41cad2d59 100644 --- a/tools/perf/util/session.h +++ b/tools/perf/util/session.h @@ -45,6 +45,11 @@ void perf_session__delete(struct perf_session *session); void perf_event_header__bswap(struct perf_event_header *hdr); +int perf_session__peek_event(struct perf_session *session, off_t file_offset, + void *buf, size_t buf_sz, + union perf_event **event_ptr, + struct perf_sample *sample); + int __perf_session__process_events(struct perf_session *session, u64 data_offset, u64 data_size, u64 size, struct perf_tool *tool); -- 1.9.3