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| author | Tom Zanussi <tom.zanussi@linux.intel.com> | 2019-02-13 17:42:43 -0600 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-02-20 13:51:06 -0500 |
| commit | c3e49506a0f426a850675e39419879214060ca8b (patch) | |
| tree | 072543df5ff7b8e183cad149832fd19433ee088e /kernel/trace/trace.c | |
| parent | 5032b38189137c21992d91b624978bace60ff78c (diff) | |
| download | lwn-c3e49506a0f426a850675e39419879214060ca8b.tar.gz lwn-c3e49506a0f426a850675e39419879214060ca8b.zip | |
tracing: Split up onmatch action data
Currently, the onmatch action data binds the onmatch action to data
related to synthetic event generation. Since we want to allow the
onmatch handler to potentially invoke a different action, and because
we expect other handlers to generate synthetic events, we need to
separate the data related to these two functions.
Also rename the onmatch data to something more descriptive, and create
and use common action data destroy function.
Link: http://lkml.kernel.org/r/b9abbf9aae69fe3920cdc8ddbcaad544dd258d78.1550100284.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index b583ff7656bb..b477926ac3bc 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4700,6 +4700,7 @@ static const char readme_msg[] = "\t [:size=#entries]\n" "\t [:pause][:continue][:clear]\n" "\t [:name=histname1]\n" + "\t [:<handler>.<action>]\n" "\t [if <filter>]\n\n" "\t When a matching event is hit, an entry is added to a hash\n" "\t table using the key(s) and value(s) named, and the value of a\n" @@ -4741,7 +4742,16 @@ static const char readme_msg[] = "\t The enable_hist and disable_hist triggers can be used to\n" "\t have one event conditionally start and stop another event's\n" "\t already-attached hist trigger. The syntax is analagous to\n" - "\t the enable_event and disable_event triggers.\n" + "\t the enable_event and disable_event triggers.\n\n" + "\t Hist trigger handlers and actions are executed whenever a\n" + "\t a histogram entry is added or updated. They take the form:\n\n" + "\t <handler>.<action>\n\n" + "\t The available handlers are:\n\n" + "\t onmatch(matching.event) - invoke on addition or update\n" + "\t onmax(var) - invoke if var exceeds current max\n\n" + "\t The available actions are:\n\n" + "\t <synthetic_event>(param list) - generate synthetic event\n" + "\t save(field,...) - save current event fields\n" #endif ; |