Messages in this thread | | | Date | Mon, 17 Feb 2014 15:46:17 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v1 07/11] x86: perf: intel_pt: Intel PT PMU driver |
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On Thu, Feb 06, 2014 at 12:50:30PM +0200, Alexander Shishkin wrote: > Add support for Intel Processor Trace (PT) to kernel's perf/itrace events. > PT is an extension of Intel Architecture that collects information about > software execuction such as control flow, execution modes and timings and > formats it into highly compressed binary packets. Even being compressed, > these packets are generated at hundreds of megabytes per second per core, > which makes it impractical to decode them on the fly in the kernel. Thus, > buffers containing this binary stream are zero-copy mapped to the debug > tools in userspace for subsequent decoding and analysis. > > Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> > --- > arch/x86/include/uapi/asm/msr-index.h | 18 + > arch/x86/kernel/cpu/Makefile | 1 + > arch/x86/kernel/cpu/intel_pt.h | 127 ++++ > arch/x86/kernel/cpu/perf_event.c | 4 + > arch/x86/kernel/cpu/perf_event_intel.c | 10 + > arch/x86/kernel/cpu/perf_event_intel_pt.c | 991 ++++++++++++++++++++++++++++++ > 6 files changed, 1151 insertions(+) > create mode 100644 arch/x86/kernel/cpu/intel_pt.h > create mode 100644 arch/x86/kernel/cpu/perf_event_intel_pt.c
Andi said that when itrace is enabled the LBR is wrecked; this patch seems to fail to deal with that.
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