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authorDave Hansen <dave.hansen@linux.intel.com>2013-06-21 15:51:38 (GMT)
committerIngo Molnar <mingo@kernel.org>2013-06-23 09:52:58 (GMT)
commit0c4df02d739fed5ab081b330d67403206dd3967e (patch)
tree37296c48ff5adef1537fd5c64977a3c1a0e8cff2 /Documentation/dell_rbu.txt
parent14c63f17b1fde5a575a28e96547a22b451c71fb5 (diff)
downloadlinux-fsl-qoriq-0c4df02d739fed5ab081b330d67403206dd3967e.tar.xz
x86: Add NMI duration tracepoints
This patch has been invaluable in my adventures finding issues in the perf NMI handler. I'm as big a fan of printk() as anybody is, but using printk() in NMIs is deadly when they're happening frequently. Even hacking in trace_printk() ended up eating enough CPU to throw off some of the measurements I was making. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: paulus@samba.org Cc: acme@ghostprotocols.net Cc: Dave Hansen <dave@sr71.net> Signed-off-by: Ingo Molnar <mingo@kernel.org>
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