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tracing: expand the ring buffers when an event is activated

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To save memory, the tracer ring buffers are set to a minimum.
The activating of a trace expands the ring buffer size. This patch
adds this expanding, when an event is activated.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt
2009-03-11 14:33:00 -04:00
parent 73c5162aa3
commit 1852fcce18
3 changed files with 31 additions and 0 deletions
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8
kernel/trace/trace_events.c
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@@ -141,6 +141,10 @@ ftrace_event_write(struct file *file, const char __user *ubuf,
if (!cnt || cnt < 0)
return 0;
ret = tracing_update_buffers();
if (ret < 0)
return ret;
ret = get_user(ch, ubuf++);
if (ret)
return ret;
@@ -331,6 +335,10 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
if (ret < 0)
return ret;
ret = tracing_update_buffers();
if (ret < 0)
return ret;
switch (val) {
case 0:
case 1: