Messages in this thread Patch in this message | | | From | Josh Poimboeuf <> | Subject | [PATCH v2 31/44] perf/x86: convert perf_callchain_kernel() to use the new unwinder | Date | Thu, 4 Aug 2016 17:22:27 -0500 |
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Convert perf_callchain_kernel() to use the new unwinder. dump_trace() has been deprecated.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> --- arch/x86/events/core.c | 33 ++++++++++----------------------- 1 file changed, 10 insertions(+), 23 deletions(-)
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 477dc38..113f90e 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -37,6 +37,7 @@ #include <asm/timer.h> #include <asm/desc.h> #include <asm/ldt.h> +#include <asm/unwind.h> #include "perf_event.h" @@ -2247,31 +2248,12 @@ void arch_perf_update_userpage(struct perf_event *event, cyc2ns_read_end(data); } -/* - * callchain support - */ - -static int backtrace_stack(void *data, const char *name) -{ - return 0; -} - -static int backtrace_address(void *data, unsigned long addr, int reliable) -{ - struct perf_callchain_entry_ctx *entry = data; - - return perf_callchain_store(entry, addr); -} - -static const struct stacktrace_ops backtrace_ops = { - .stack = backtrace_stack, - .address = backtrace_address, - .walk_stack = print_context_stack_bp, -}; - void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { + struct unwind_state state; + unsigned long addr; + if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { /* TODO: We don't support guest os callchain now */ return; @@ -2280,7 +2262,12 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *re if (perf_callchain_store(entry, regs->ip)) return; - dump_trace(NULL, regs, NULL, 0, &backtrace_ops, entry); + for (unwind_start(&state, NULL, regs, NULL); !unwind_done(&state); + unwind_next_frame(&state)) { + addr = unwind_get_return_address(&state); + if (!addr || perf_callchain_store(entry, addr)) + return; + } } static inline int -- 2.7.4
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