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Intel Skylake supports reporting the time in cycles a branch in the LBR
took, to give a rough indication of the basic block performance.
Export the cycle information in the branch_info structure.
This can be done by just reusing some currently zero padding.
This is just the generic header change. The architecture
still needs to fill it in.
There's no attempt to convert to real time, as we really
want cycles here.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: eranian@google.com
Link: http://lkml.kernel.org/r/1431285767-27027-5-git-send-email-andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>