diff options
| author | Steven Rostedt <srostedt@redhat.com> | 2011-06-14 22:44:07 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2011-06-14 22:48:45 -0400 |
| commit | cf30cf67d6c7592c670ec946d89fc15ee0deb0eb (patch) | |
| tree | f86ca612b255ee8570e2fd6198e066ea8cf33fe0 /kernel/trace | |
| parent | 4f271a2a60c748599b30bb4dafff30d770439b96 (diff) | |
| download | lwn-cf30cf67d6c7592c670ec946d89fc15ee0deb0eb.tar.gz lwn-cf30cf67d6c7592c670ec946d89fc15ee0deb0eb.zip | |
tracing: Add disable_on_free option
Add a trace option to disable tracing on free. When this option is
set, a write into the free_buffer file will not only shrink the
ring buffer down to zero, but it will also disable tracing.
Cc: Vaibhav Nagarnaik <vnagarnaik@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace.c | 6 | ||||
| -rw-r--r-- | kernel/trace/trace.h | 1 |
2 files changed, 5 insertions, 2 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 9c557ae6a21e..42fdf3adff31 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -425,6 +425,7 @@ static const char *trace_options[] = { "graph-time", "record-cmd", "overwrite", + "disable_on_free", NULL }; @@ -3518,8 +3519,9 @@ tracing_free_buffer_write(struct file *filp, const char __user *ubuf, static int tracing_free_buffer_release(struct inode *inode, struct file *filp) { - /* disable tracing */ - tracing_off(); + /* disable tracing ? */ + if (trace_flags & TRACE_ITER_STOP_ON_FREE) + tracing_off(); /* resize the ring buffer to 0 */ tracing_resize_ring_buffer(0); diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 229f8591f61d..742f545ae185 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -609,6 +609,7 @@ enum trace_iterator_flags { TRACE_ITER_GRAPH_TIME = 0x80000, TRACE_ITER_RECORD_CMD = 0x100000, TRACE_ITER_OVERWRITE = 0x200000, + TRACE_ITER_STOP_ON_FREE = 0x400000, }; /* |