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(parent: d478820) | patch
ring-buffer: do not grab locks in nmi
authorSteven Rostedt <srostedt@redhat.com>
Wed, 17 Jun 2009 01:22:48 +0000 (21:22 -0400)
committerSteven Rostedt <rostedt@goodmis.org>
Wed, 17 Jun 2009 18:16:27 +0000 (14:16 -0400)
commit8d707e8eb4de4b930573155ab4df4b3270ee25dd
tree2594b38c73fa1c944587f62a2f9ce70fe4f90ce4tree | snapshot
parentd47882078f05c2cb46b85f1e12a58ed9315b9d63commit | diff
ring-buffer: do not grab locks in nmi

If ftrace_dump_on_oops is set, and an NMI detects a lockup, then it
will need to read from the ring buffer. But the read side of the
ring buffer still takes locks. This patch adds a check on the read
side that if it is in an NMI, then it will disable the ring buffer
and not take any locks.

Reads can still happen on a disabled ring buffer.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
kernel/trace/ring_buffer.c diff | blob | history
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