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    Subject[PATCH 3/3] perf/x86-64: Use frame pointer to walk on irq and process stacks
    Date
    We were using the frame pointer based stack walker on every
    contexts in x86-32, but not in x86-64 where we only use the
    seven-league boots on the exception stacks.

    Use it also on irq and process stacks. This utterly accelerate
    the captures.

    Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    arch/x86/kernel/dumpstack_64.c | 4 ++--
    1 files changed, 2 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
    index 676bc05..cab4f72 100644
    --- a/arch/x86/kernel/dumpstack_64.c
    +++ b/arch/x86/kernel/dumpstack_64.c
    @@ -202,7 +202,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
    if (in_irq_stack(stack, irq_stack, irq_stack_end)) {
    if (ops->stack(data, "IRQ") < 0)
    break;
    - bp = print_context_stack(tinfo, stack, bp,
    + bp = ops->walk_stack(tinfo, stack, bp,
    ops, data, irq_stack_end, &graph);
    /*
    * We link to the next stack (which would be
    @@ -223,7 +223,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
    /*
    * This handles the process stack:
    */
    - bp = print_context_stack(tinfo, stack, bp, ops, data, NULL, &graph);
    + bp = ops->walk_stack(tinfo, stack, bp, ops, data, NULL, &graph);
    put_cpu();
    }
    EXPORT_SYMBOL(dump_trace);
    --
    1.6.2.3


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