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| author | Steven Rostedt <srostedt@redhat.com> | 2009-04-29 17:43:37 (GMT) |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2009-05-05 17:51:02 (GMT) |
| commit | f0d2c681ac0a85142fc8abe65fc33fcad35cb9b7 (patch) | |
| tree | eafd2b655fc7ad0695fc5dbc343bcc1eb17e2e32 /usr/gen_init_cpio.c | |
| parent | d6ce96dabe2c4409fd009ec14250a1fdbab4b133 (diff) | |
| download | linux-fsl-qoriq-f0d2c681ac0a85142fc8abe65fc33fcad35cb9b7.tar.xz | |
ring-buffer: add counters for commit overrun and nmi dropped entries
The WARN_ON in the ring buffer when a commit is preempted and the
buffer is filled by preceding writes can happen in normal operations.
The WARN_ON makes it look like a bug, not to mention, because
it does not stop tracing and calls printk which can also recurse, this
is prone to deadlock (the WARN_ON is not in a position to recurse).
This patch removes the WARN_ON and replaces it with a counter that
can be retrieved by a tracer. This counter is called commit_overrun.
While at it, I added a nmi_dropped counter to count any time an NMI entry
is dropped because the NMI could not take the spinlock.
[ Impact: prevent deadlock by printing normal case warning ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'usr/gen_init_cpio.c')
0 files changed, 0 insertions, 0 deletions