diff options
| author | Masami Hiramatsu <[email protected]> | 2013-05-09 14:44:29 +0900 |
|---|---|---|
| committer | Steven Rostedt <[email protected]> | 2013-05-09 20:14:25 -0400 |
| commit | 1cf4c0732db3cd3c49cadbc60ff6bda08604e6fa (patch) | |
| tree | 74133737a3ecea18847788c10fae7bb474f1aaa8 /lib/mpi/mpi-bit.c | |
| parent | 30052170dcc256c18a43fb3e76577a67394543f8 (diff) | |
tracing: Modify soft-mode only if there's no other referrer
Modify soft-mode flag only if no other soft-mode referrer
(currently only the ftrace triggers) by using a reference
counter in each ftrace_event_file.
Without this fix, adding and removing several different
enable/disable_event triggers on the same event clear
soft-mode bit from the ftrace_event_file. This also
happens with a typo of glob on setting triggers.
e.g.
# echo vfs_symlink:enable_event:net:netif_rx > set_ftrace_filter
# cat events/net/netif_rx/enable
0*
# echo typo_func:enable_event:net:netif_rx > set_ftrace_filter
# cat events/net/netif_rx/enable
0
# cat set_ftrace_filter
#### all functions enabled ####
vfs_symlink:enable_event:net:netif_rx:unlimited
As above, we still have a trigger, but soft-mode is gone.
Link: http://lkml.kernel.org/r/20130509054429.30398.7464.stgit@mhiramat-M0-7522
Cc: Srikar Dronamraju <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: David Sharp <[email protected]>
Cc: Hiraku Toyooka <[email protected]>
Cc: Tom Zanussi <[email protected]>
Signed-off-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
Diffstat (limited to 'lib/mpi/mpi-bit.c')
0 files changed, 0 insertions, 0 deletions