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Subject[PATCH 04/16 v2] tracing: Add disable_on_free option
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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