Messages in this thread Patch in this message | | | Date | Tue, 4 Aug 2015 01:57:16 -0700 | From | tip-bot for Andi Kleen <> | Subject | [tip:perf/core] perf: Add cycles to branch_info |
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Commit-ID: 71ef3c6b9d4665ee7afbbe4c208a98917dcfc32f Gitweb: http://git.kernel.org/tip/71ef3c6b9d4665ee7afbbe4c208a98917dcfc32f Author: Andi Kleen <ak@linux.intel.com> AuthorDate: Sun, 10 May 2015 12:22:42 -0700 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Tue, 4 Aug 2015 10:16:57 +0200
perf: Add cycles to branch_info
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> --- include/uapi/linux/perf_event.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index 022d0ac..2881145 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -951,6 +951,7 @@ union perf_mem_data_src { * * in_tx: running in a hardware transaction * abort: aborting a hardware transaction + * cycles: cycles from last branch (or 0 if not supported) */ struct perf_branch_entry { __u64 from; @@ -959,7 +960,8 @@ struct perf_branch_entry { predicted:1,/* target predicted */ in_tx:1, /* in transaction */ abort:1, /* transaction abort */ - reserved:60; + cycles:16, /* cycle count to last branch */ + reserved:44; }; #endif /* _UAPI_LINUX_PERF_EVENT_H */
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