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author | Steven Rostedt <srostedt@redhat.com> | 2008-12-17 15:05:36 -0500 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-12-18 12:57:09 +0100 |
commit | ea3a6d6d60b2504c573fe3415f6617e8310c0236 (patch) | |
tree | 3c0887bebd1986107d9bf206c252f626dcf32b64 | |
parent | e05a43b744fb9518cbf8539a7ef33164ac60a70f (diff) | |
download | lwn-ea3a6d6d60b2504c573fe3415f6617e8310c0236.tar.gz lwn-ea3a6d6d60b2504c573fe3415f6617e8310c0236.zip |
ftrace: add not to regex on filtering functions
Impact: enhancement
Ingo Molnar has asked about a way to remove items from the filter
lists. Currently, you can only add or replace items. The way
items are added to the list is through opening one of the list
files (set_ftrace_filter or set_ftrace_notrace) via append.
If the file is opened for truncate, the list is cleared.
echo spin_lock > /debug/tracing/set_ftrace_filter
The above will replace the list with only spin_lock
echo spin_lock >> /debug/tracing/set_ftrace_filter
The above will add spin_lock to the list.
Now this patch adds:
echo '!spin_lock' >> /debug/tracing/set_ftrace_filter
This will remove spin_lock from the list.
The limited glob features of these lists also can be notted.
echo '!spin_*' >> /debug/tracing/set_ftrace_filter
This will remove all functions that start with 'spin_'
Note:
echo '!spin_*' > /debug/tracing/set_ftrace_filter
will simply clear out the list (notice the '>' instead of '>>')
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r-- | kernel/trace/ftrace.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index a12f80efceaa..2f32969c09df 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -1047,6 +1047,13 @@ ftrace_match(unsigned char *buff, int len, int enable) int type = MATCH_FULL; unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; unsigned i, match = 0, search_len = 0; + int not = 0; + + if (buff[0] == '!') { + not = 1; + buff++; + len--; + } for (i = 0; i < len; i++) { if (buff[i] == '*') { @@ -1100,8 +1107,12 @@ ftrace_match(unsigned char *buff, int len, int enable) matched = 1; break; } - if (matched) - rec->flags |= flag; + if (matched) { + if (not) + rec->flags &= ~flag; + else + rec->flags |= flag; + } } pg = pg->next; } |