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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-06-17 14:32:34 -0400 |
|---|---|---|
| committer | Lee Jones <joneslee@google.com> | 2021-08-19 11:02:17 +0100 |
| commit | db2234425d4945ba7ae5efa3587eb624bda828dc (patch) | |
| tree | 2e8e8a0a6d75c5a355ef6f01acc30cea8e9fad01 | |
| parent | 57f72e8e6a9e3d536d7ab461cd55f68644c67a8b (diff) | |
| download | mediatek-db2234425d4945ba7ae5efa3587eb624bda828dc.tar.gz | |
tracing: Do not stop recording comms if the trace file is being read
commit 4fdd595e4f9a1ff6d93ec702eaecae451cfc6591 upstream.
A while ago, when the "trace" file was opened, tracing was stopped, and
code was added to stop recording the comms to saved_cmdlines, for mapping
of the pids to the task name.
Code has been added that only records the comm if a trace event occurred,
and there's no reason to not trace it if the trace file is opened.
Cc: stable@vger.kernel.org
Fixes: 7ffbd48d5cab2 ("tracing: Cache comms only after an event occurred")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I879667f668fbca426b7f8f61b5e3f60da857c4ba
| -rw-r--r-- | kernel/trace/trace.c | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index a748779650fc..96954b520d43 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1300,9 +1300,6 @@ struct saved_cmdlines_buffer { }; static struct saved_cmdlines_buffer *savedcmd; -/* temporary disable recording */ -static atomic_t trace_record_cmdline_disabled __read_mostly; - static inline char *get_saved_cmdlines(int idx) { return &savedcmd->saved_cmdlines[idx * TASK_COMM_LEN]; @@ -2481,9 +2478,6 @@ static void *s_start(struct seq_file *m, loff_t *pos) return ERR_PTR(-EBUSY); #endif - if (!iter->snapshot) - atomic_inc(&trace_record_cmdline_disabled); - if (*pos != iter->pos) { iter->ent = NULL; iter->cpu = 0; @@ -2526,9 +2520,6 @@ static void s_stop(struct seq_file *m, void *p) return; #endif - if (!iter->snapshot) - atomic_dec(&trace_record_cmdline_disabled); - trace_access_unlock(iter->cpu_file); trace_event_read_unlock(); } |