Messages in this thread |  | | | Date | Wed, 15 Jun 2011 16:25:27 +0200 | | From | Frederic Weisbecker <> | | Subject | Re: [PATCH 03/16 v2] tracing: Add a proc file to stop tracing and free buffer |
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On Wed, Jun 15, 2011 at 09:48:44AM -0400, Steven Rostedt wrote: > From: Vaibhav Nagarnaik <vnagarnaik@google.com> > > The proc file entry buffer_size_kb is used to set the size of tracing > buffer. > > The memory to expand the buffer size is kernel memory. Consider > a use case where tracing is handled by a user space utility, which acts > as a gate keeper for tracing requests. In an OOM condition, tracing is > considered a low priority task and if the utility gets killed the ring > buffer memory cannot be released back to the kernel. > > This patch adds a proc file called "free_buffer" whose purpose is to > stop tracing and free up the ring buffer when it is closed. > > The user space process can then set the desired size in buffer_size_kb > file and open the fd to the "free_buffer" file. Under OOM condition, if > the process gets killed, the kernel closes the file descriptor. The > release handler stops the tracing and releases the kernel memory > automatically. > > Cc: Ingo Molnar <mingo@redhat.com> > Cc: Frederic Weisbecker <fweisbec@gmail.com> > Cc: Michael Rubin <mrubin@google.com> > Cc: David Sharp <dhsharp@google.com> > Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com> > Link: http://lkml.kernel.org/r/1308012717-11148-1-git-send-email-vnagarnaik@google.com > Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
s/proc/debugfs, right?
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