lkml.org 
[lkml]   [2011]   [Jul]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 1/6] x86: Save stack pointer in perf live regs savings
    Date
    In order to prepare for fetching the stack pointer from the
    regs when possible in dump_trace() instead of taking the
    local one, save the current stack pointer in perf live regs saving.

    Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    arch/x86/include/asm/perf_event.h | 5 +++++
    1 files changed, 5 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
    index d9d4dae..094fb30 100644
    --- a/arch/x86/include/asm/perf_event.h
    +++ b/arch/x86/include/asm/perf_event.h
    @@ -152,6 +152,11 @@ extern unsigned long perf_misc_flags(struct pt_regs *regs);
    (regs)->bp = caller_frame_pointer(); \
    (regs)->cs = __KERNEL_CS; \
    regs->flags = 0; \
    + asm volatile( \
    + _ASM_MOV "%%"_ASM_SP ", %0\n" \
    + : "=m" ((regs)->sp) \
    + :: "memory" \
    + ); \
    }

    #else
    --
    1.7.5.4


    \
     
     \ /
      Last update: 2011-07-02 18:33    [W:0.018 / U:151.844 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site