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authorTom Zanussi <tzanussi@gmail.com>2010-04-02 08:59:21 +0400
committerIngo Molnar <mingo@elte.hu>2010-04-14 13:56:07 +0400
commit9215545e99d8c0b27323df2de504f4294bf5e407 (patch)
treeb53dde70374d2f8a8cd12c44c3637665e559cb16 /tools/perf/util/trace-event-info.c
parentcd19a035f3b63fee6dcbdb5371c4b22276f7dc8c (diff)
downloadlinux-9215545e99d8c0b27323df2de504f4294bf5e407.tar.xz
perf: Convert perf tracing data into a tracing_data event
Bypasses the tracing_data perf header code and replaces it with a synthesized event and processing function that accomplishes the same thing, used when reading/writing perf data to/from a pipe. The tracing data is pretty large, and this patch doesn't attempt to break it down into component events. The tracing_data event itself doesn't actually contain the tracing data, rather it arranges for the event processing code to skip over it after it's read, using the skip return value added to the event processing loop in a previous patch. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org Cc: k-keiichi@bx.jp.nec.com Cc: acme@ghostprotocols.net LKML-Reference: <1270184365-8281-8-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/util/trace-event-info.c')
-rw-r--r--tools/perf/util/trace-event-info.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index 5ea8973ad331..30cd9b575953 100644
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -154,10 +154,17 @@ static void put_tracing_file(char *file)
free(file);
}
+static ssize_t calc_data_size;
+
static ssize_t write_or_die(const void *buf, size_t len)
{
int ret;
+ if (calc_data_size) {
+ calc_data_size += len;
+ return len;
+ }
+
ret = write(output_fd, buf, len);
if (ret < 0)
die("writing to '%s'", output_file);
@@ -526,3 +533,20 @@ int read_tracing_data(int fd, struct perf_event_attr *pattrs, int nb_events)
return 0;
}
+
+ssize_t read_tracing_data_size(int fd, struct perf_event_attr *pattrs,
+ int nb_events)
+{
+ ssize_t size;
+ int err = 0;
+
+ calc_data_size = 1;
+ err = read_tracing_data(fd, pattrs, nb_events);
+ size = calc_data_size - 1;
+ calc_data_size = 0;
+
+ if (err < 0)
+ return err;
+
+ return size;
+}