Messages in this thread Patch in this message | | | Date | Wed, 15 Jun 2011 09:48:45 -0400 | From | Steven Rostedt <> | Subject | [PATCH 04/16 v2] tracing: Add disable_on_free option |
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From: Steven Rostedt <srostedt@redhat.com>
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> --- kernel/trace/trace.c | 6 ++++-- 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 9c557ae..42fdf3a 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 229f859..742f545 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, }; /* -- 1.7.4.4
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