forked from luck/tmp_suning_uos_patched
perf record: Introduce special handling for pipe output
Adds special treatment for stdout - if the user specifies '-o -' to perf record, the intent is that the event stream be written to stdout rather than to a disk file. Also, redirect stdout of forked child to stderr - in pipe mode, stdout of the forked child interferes with the stdout perf stream, so redirect it to stderr where it can still be seen but won't be mixed in with the perf output. 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: <1270184365-8281-3-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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parent
8dc58101f2
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529870e374
@ -35,6 +35,7 @@ static unsigned int page_size;
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static unsigned int mmap_pages = 128;
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static int freq = 1000;
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static int output;
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static int pipe_output = 0;
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static const char *output_name = "perf.data";
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static int group = 0;
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static unsigned int realtime_prio = 0;
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@ -449,7 +450,9 @@ static int __cmd_record(int argc, const char **argv)
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exit(-1);
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}
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if (!stat(output_name, &st) && st.st_size) {
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if (!strcmp(output_name, "-"))
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pipe_output = 1;
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else if (!stat(output_name, &st) && st.st_size) {
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if (!force) {
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if (!append_file) {
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pr_err("Error, output file %s exists, use -A "
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@ -474,7 +477,10 @@ static int __cmd_record(int argc, const char **argv)
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else
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flags |= O_TRUNC;
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output = open(output_name, flags, S_IRUSR|S_IWUSR);
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if (pipe_output)
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output = STDOUT_FILENO;
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else
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output = open(output_name, flags, S_IRUSR | S_IWUSR);
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if (output < 0) {
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perror("failed to create output file");
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exit(-1);
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@ -513,6 +519,8 @@ static int __cmd_record(int argc, const char **argv)
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}
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if (!child_pid) {
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if (pipe_output)
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dup2(2, 1);
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close(child_ready_pipe[0]);
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close(go_pipe[1]);
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fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
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@ -564,7 +572,11 @@ static int __cmd_record(int argc, const char **argv)
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open_counters(cpumap[i]);
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}
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if (file_new) {
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if (pipe_output) {
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err = perf_header__write_pipe(output);
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if (err < 0)
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return err;
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} else if (file_new) {
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err = perf_header__write(&session->header, output, false);
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if (err < 0)
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return err;
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