From 94b4d89e0021fe3e10415feede364a3fccaa2f89 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Tue, 4 Jun 2013 14:20:26 +0900 Subject: perf util: Parse header_page to get proper long size The header_page file describes the format of the ring buffer page which is used by ftrace (not perf). And size of "commit" field (I guess it's older name was 'size') represents the real size of long type used for kernel. So update the pevent's long size. Signed-off-by: Namhyung Kim Cc: David Ahern Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Jiri Olsa Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Steven Rostedt Link: http://lkml.kernel.org/r/1370323231-14022-12-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/trace-event-read.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c index fa45fca2a2d3..f2112270c663 100644 --- a/tools/perf/util/trace-event-read.c +++ b/tools/perf/util/trace-event-read.c @@ -212,6 +212,7 @@ static int read_ftrace_printk(struct pevent *pevent) static int read_header_files(struct pevent *pevent) { unsigned long long size; + char *header_page; char buf[BUFSIZ]; int ret = 0; @@ -224,7 +225,26 @@ static int read_header_files(struct pevent *pevent) } size = read8(pevent); - skip(size); + + header_page = malloc(size); + if (header_page == NULL) + return -1; + + if (do_read(header_page, size) < 0) { + pr_debug("did not read header page"); + free(header_page); + return -1; + } + + if (!pevent_parse_header_page(pevent, header_page, size, + pevent_get_long_size(pevent))) { + /* + * The commit field in the page is of type long, + * use that instead, since it represents the kernel. + */ + pevent_set_long_size(pevent, pevent->header_page_size_size); + } + free(header_page); if (do_read(buf, 13) < 0) return -1; -- cgit v1.2.3-55-g7522