tree 37296c48ff5adef1537fd5c64977a3c1a0e8cff2
parent 14c63f17b1fde5a575a28e96547a22b451c71fb5
author Dave Hansen <dave.hansen@linux.intel.com> 1371829898 -0700
committer Ingo Molnar <mingo@kernel.org> 1371981178 +0200

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>