From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756351AbcFGUKo (ORCPT ); Tue, 7 Jun 2016 16:10:44 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:60692 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161188AbcFGUF3 (ORCPT ); Tue, 7 Jun 2016 16:05:29 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, He Kuang , Adrian Hunter , Alexander Shishkin , Andi Kleen , David Ahern , Ekaterina Tumanova , Josh Poimboeuf , Kan Liang , Masami Hiramatsu , Namhyung Kim , Pekka Enberg , Peter Zijlstra , Stephane Eranian , Sukadev Bhattiprolu , Wang Nan , Arnaldo Carvalho de Melo Subject: [PATCH 13/24] perf unwind: Introduce 'struct unwind_libunwind_ops' for local unwind Date: Tue, 7 Jun 2016 17:04:51 -0300 Message-Id: <1465329902-11069-14-git-send-email-acme@kernel.org> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1465329902-11069-1-git-send-email-acme@kernel.org> References: <1465329902-11069-1-git-send-email-acme@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: He Kuang Currently, libunwind operations are fixed, and they are chosen according to the host architecture. This will lead to a problem that if a thread is run as x86_32 on a x86_64 machine, perf will use libunwind methods for x86_64 to parse the callchain and get wrong results. This patch changes the fixed methods of libunwind operations to be thread/map related, and each thread can have individual libunwind operations. Local libunwind methods are registered as default value. Signed-off-by: He Kuang Acked-by: Jiri Olsa Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: David Ahern Cc: Ekaterina Tumanova Cc: Josh Poimboeuf Cc: Kan Liang Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Pekka Enberg Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Sukadev Bhattiprolu Cc: Wang Nan Link: http://lkml.kernel.org/r/1464924803-22214-4-git-send-email-hekuang@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/thread.h | 4 ++- tools/perf/util/unwind-libunwind.c | 53 +++++++++++++++++++++++++++++++++++--- tools/perf/util/unwind.h | 9 +++++++ 3 files changed, 61 insertions(+), 5 deletions(-) diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h index 4c9f0aa11f1f..07ffb18221ab 100644 --- a/tools/perf/util/thread.h +++ b/tools/perf/util/thread.h @@ -11,6 +11,7 @@ #include struct thread_stack; +struct unwind_libunwind_ops; struct thread { union { @@ -33,7 +34,8 @@ struct thread { void *priv; struct thread_stack *ts; #ifdef HAVE_LIBUNWIND_SUPPORT - void *addr_space; + void *addr_space; + struct unwind_libunwind_ops *unwind_libunwind_ops; #endif }; diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c index 63687d3a344e..b0c5db1333f9 100644 --- a/tools/perf/util/unwind-libunwind.c +++ b/tools/perf/util/unwind-libunwind.c @@ -579,7 +579,7 @@ static unw_accessors_t accessors = { .get_proc_name = get_proc_name, }; -int unwind__prepare_access(struct thread *thread) +static int _unwind__prepare_access(struct thread *thread) { if (callchain_param.record_mode != CALLCHAIN_DWARF) return 0; @@ -594,7 +594,7 @@ int unwind__prepare_access(struct thread *thread) return 0; } -void unwind__flush_access(struct thread *thread) +static void _unwind__flush_access(struct thread *thread) { if (callchain_param.record_mode != CALLCHAIN_DWARF) return; @@ -602,7 +602,7 @@ void unwind__flush_access(struct thread *thread) unw_flush_cache(thread->addr_space, 0, 0); } -void unwind__finish_access(struct thread *thread) +static void _unwind__finish_access(struct thread *thread) { if (callchain_param.record_mode != CALLCHAIN_DWARF) return; @@ -662,7 +662,7 @@ static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb, return ret; } -int unwind__get_entries(unwind_entry_cb_t cb, void *arg, +static int _unwind__get_entries(unwind_entry_cb_t cb, void *arg, struct thread *thread, struct perf_sample *data, int max_stack) { @@ -680,3 +680,48 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg, return get_entries(&ui, cb, arg, max_stack); } + +static struct unwind_libunwind_ops +_unwind_libunwind_ops = { + .prepare_access = _unwind__prepare_access, + .flush_access = _unwind__flush_access, + .finish_access = _unwind__finish_access, + .get_entries = _unwind__get_entries, +}; + +struct unwind_libunwind_ops * +local_unwind_libunwind_ops = &_unwind_libunwind_ops; + +static void unwind__register_ops(struct thread *thread, + struct unwind_libunwind_ops *ops) +{ + thread->unwind_libunwind_ops = ops; +} + +int unwind__prepare_access(struct thread *thread) +{ + unwind__register_ops(thread, local_unwind_libunwind_ops); + + return thread->unwind_libunwind_ops->prepare_access(thread); +} + +void unwind__flush_access(struct thread *thread) +{ + if (thread->unwind_libunwind_ops) + thread->unwind_libunwind_ops->flush_access(thread); +} + +void unwind__finish_access(struct thread *thread) +{ + if (thread->unwind_libunwind_ops) + thread->unwind_libunwind_ops->finish_access(thread); +} + +int unwind__get_entries(unwind_entry_cb_t cb, void *arg, + struct thread *thread, + struct perf_sample *data, int max_stack) +{ + if (thread->unwind_libunwind_ops) + return thread->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack); + return 0; +} diff --git a/tools/perf/util/unwind.h b/tools/perf/util/unwind.h index 12790cf94618..bbd73d9bea45 100644 --- a/tools/perf/util/unwind.h +++ b/tools/perf/util/unwind.h @@ -14,6 +14,15 @@ struct unwind_entry { typedef int (*unwind_entry_cb_t)(struct unwind_entry *entry, void *arg); +struct unwind_libunwind_ops { + int (*prepare_access)(struct thread *thread); + void (*flush_access)(struct thread *thread); + void (*finish_access)(struct thread *thread); + int (*get_entries)(unwind_entry_cb_t cb, void *arg, + struct thread *thread, + struct perf_sample *data, int max_stack); +}; + #ifdef HAVE_DWARF_UNWIND_SUPPORT int unwind__get_entries(unwind_entry_cb_t cb, void *arg, struct thread *thread, -- 2.5.5