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 <[email protected]> > --- > 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
