This is a note to let you know that I've just added the patch titled
ftrace: Only update the function code on write to filter files
to the 2.6.33-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.33.git;a=summary
The filename of the patch is:
ftrace-only-update-the-function-code-on-write-to-filter-files.patch
and it can be found in the queue-2.6.33 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.33 longterm
tree,
please let <[email protected]> know about it.
>From 058e297d34a404caaa5ed277de15698d8dc43000 Mon Sep 17 00:00:00 2001
From: Steven Rostedt <[email protected]>
Date: Fri, 29 Apr 2011 22:35:33 -0400
Subject: ftrace: Only update the function code on write to filter files
From: Steven Rostedt <[email protected]>
commit 058e297d34a404caaa5ed277de15698d8dc43000 upstream.
If function tracing is enabled, a read of the filter files will
cause the call to stop_machine to update the function trace sites.
It should only call stop_machine on write.
Signed-off-by: Steven Rostedt <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/trace/ftrace.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2367,14 +2367,16 @@ ftrace_regex_release(struct inode *inode
ftrace_match_records(parser->buffer, parser->idx, enable);
}
- mutex_lock(&ftrace_lock);
- if (ftrace_start_up && ftrace_enabled)
- ftrace_run_update_code(FTRACE_ENABLE_CALLS);
- mutex_unlock(&ftrace_lock);
-
trace_parser_put(parser);
kfree(iter);
+ if (file->f_mode & FMODE_WRITE) {
+ mutex_lock(&ftrace_lock);
+ if (ftrace_start_up && ftrace_enabled)
+ ftrace_run_update_code(FTRACE_ENABLE_CALLS);
+ mutex_unlock(&ftrace_lock);
+ }
+
mutex_unlock(&ftrace_regex_lock);
return 0;
}
Patches currently in longterm-queue-2.6.33 which might be from
[email protected] are
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