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authorSteven Rostedt <srostedt@redhat.com>2008-12-17 15:05:36 -0500
committerIngo Molnar <mingo@elte.hu>2008-12-18 06:57:09 -0500
commitea3a6d6d60b2504c573fe3415f6617e8310c0236 (patch)
tree3c0887bebd1986107d9bf206c252f626dcf32b64 /kernel/trace/ftrace.c
parente05a43b744fb9518cbf8539a7ef33164ac60a70f (diff)
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>
Diffstat (limited to 'kernel/trace/ftrace.c')
-rw-r--r--kernel/trace/ftrace.c15
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)
1047 int type = MATCH_FULL; 1047 int type = MATCH_FULL;
1048 unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; 1048 unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
1049 unsigned i, match = 0, search_len = 0; 1049 unsigned i, match = 0, search_len = 0;
1050 int not = 0;
1051
1052 if (buff[0] == '!') {
1053 not = 1;
1054 buff++;
1055 len--;
1056 }
1050 1057
1051 for (i = 0; i < len; i++) { 1058 for (i = 0; i < len; i++) {
1052 if (buff[i] == '*') { 1059 if (buff[i] == '*') {
@@ -1100,8 +1107,12 @@ ftrace_match(unsigned char *buff, int len, int enable)
1100 matched = 1; 1107 matched = 1;
1101 break; 1108 break;
1102 } 1109 }
1103 if (matched) 1110 if (matched) {
1104 rec->flags |= flag; 1111 if (not)
1112 rec->flags &= ~flag;
1113 else
1114 rec->flags |= flag;
1115 }
1105 } 1116 }
1106 pg = pg->next; 1117 pg = pg->next;
1107 } 1118 }