lkml.org 
[lkml]   [2014]   [Feb]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH v1 07/11] x86: perf: intel_pt: Intel PT PMU driver
    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.


    \
     
     \ /
      Last update: 2014-02-17 16:01    [W:4.839 / U:0.108 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site