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| author | Steven Rostedt <srostedt@redhat.com> | 2008-05-12 21:20:45 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-23 20:41:06 +0200 |
| commit | 77a2b37d227483fe52aead242652aee406c25bf0 (patch) | |
| tree | cecb6a3a02a567530e2ce3502de18f371c9db7c1 /kernel/trace/ftrace.c | |
| parent | 7bd2f24c2f769e3f8f1d4fc8b9fddf689825f6a7 (diff) | |
| download | blackbird-op-linux-77a2b37d227483fe52aead242652aee406c25bf0.tar.gz blackbird-op-linux-77a2b37d227483fe52aead242652aee406c25bf0.zip | |
ftrace: startup tester on dynamic tracing.
This patch adds a startup self test on dynamic code modification
and filters. The test filters on a specific function, makes sure that
no other function is traced, exectutes the function, then makes sure that
the function is traced.
This patch also fixes a slight bug with the ftrace selftest, where
tracer_enabled was not being set.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/trace/ftrace.c')
| -rw-r--r-- | kernel/trace/ftrace.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 6d4d2e86debc..5e9389faaf75 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -1010,6 +1010,25 @@ ftrace_filter_write(struct file *file, const char __user *ubuf, return ret; } +/** + * ftrace_set_filter - set a function to filter on in ftrace + * @buf - the string that holds the function filter text. + * @len - the length of the string. + * @reset - non zero to reset all filters before applying this filter. + * + * Filters denote which functions should be enabled when tracing is enabled. + * If @buf is NULL and reset is set, all functions will be enabled for tracing. + */ +notrace void ftrace_set_filter(unsigned char *buf, int len, int reset) +{ + mutex_lock(&ftrace_filter_lock); + if (reset) + ftrace_filter_reset(); + if (buf) + ftrace_match(buf, len); + mutex_unlock(&ftrace_filter_lock); +} + static int notrace ftrace_filter_release(struct inode *inode, struct file *file) { |
