perf/x86-64: Use frame pointer to walk on irq and process stacks
Frederic Weisbecker [Wed, 3 Mar 2010 06:38:37 +0000 (07:38 +0100)]
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

index d5e2a2e..272c9f1 100644 (file)
@@ -208,7 +208,7 @@ 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
@@ -229,7 +229,7 @@ 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);