Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932692AbcDGVAf (ORCPT ); Thu, 7 Apr 2016 17:00:35 -0400 Received: from casper.infradead.org ([85.118.1.10]:49143 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932522AbcDGU6z (ORCPT ); Thu, 7 Apr 2016 16:58:55 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Jiri Olsa , Andreas Hollmann , David Ahern , Namhyung Kim , Peter Zijlstra , Arnaldo Carvalho de Melo Subject: [PATCH 12/19] perf tools: Add dedicated unwind addr_space member into thread struct Date: Thu, 7 Apr 2016 17:58:33 -0300 Message-Id: <1460062720-21736-13-git-send-email-acme@kernel.org> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1460062720-21736-1-git-send-email-acme@kernel.org> References: <1460062720-21736-1-git-send-email-acme@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.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 Content-Length: 3356 Lines: 120 From: Jiri Olsa Milian reported issue with thread::priv, which was double booked by perf trace and DWARF unwind code. So using those together is impossible at the moment. Moving DWARF unwind private data into separate variable so perf trace can keep using thread::priv. Reported-by: Milian Wolff Signed-off-by: Jiri Olsa Cc: Andreas Hollmann Cc: David Ahern Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1460013073-18444-2-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/thread.h | 6 ++++++ tools/perf/util/unwind-libunwind.c | 25 +++++++++---------------- 2 files changed, 15 insertions(+), 16 deletions(-) diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h index a0ac0317affb..e214207bb13a 100644 --- a/tools/perf/util/thread.h +++ b/tools/perf/util/thread.h @@ -9,6 +9,9 @@ #include "symbol.h" #include #include +#ifdef HAVE_LIBUNWIND_SUPPORT +#include +#endif struct thread_stack; @@ -32,6 +35,9 @@ struct thread { void *priv; struct thread_stack *ts; +#ifdef HAVE_LIBUNWIND_SUPPORT + unw_addr_space_t addr_space; +#endif }; struct machine; diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c index ee7e372297e5..63687d3a344e 100644 --- a/tools/perf/util/unwind-libunwind.c +++ b/tools/perf/util/unwind-libunwind.c @@ -32,6 +32,7 @@ #include "symbol.h" #include "util.h" #include "debug.h" +#include "asm/bug.h" extern int UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as, @@ -580,43 +581,33 @@ static unw_accessors_t accessors = { int unwind__prepare_access(struct thread *thread) { - unw_addr_space_t addr_space; - if (callchain_param.record_mode != CALLCHAIN_DWARF) return 0; - addr_space = unw_create_addr_space(&accessors, 0); - if (!addr_space) { + thread->addr_space = unw_create_addr_space(&accessors, 0); + if (!thread->addr_space) { pr_err("unwind: Can't create unwind address space.\n"); return -ENOMEM; } - unw_set_caching_policy(addr_space, UNW_CACHE_GLOBAL); - thread__set_priv(thread, addr_space); - + unw_set_caching_policy(thread->addr_space, UNW_CACHE_GLOBAL); return 0; } void unwind__flush_access(struct thread *thread) { - unw_addr_space_t addr_space; - if (callchain_param.record_mode != CALLCHAIN_DWARF) return; - addr_space = thread__priv(thread); - unw_flush_cache(addr_space, 0, 0); + unw_flush_cache(thread->addr_space, 0, 0); } void unwind__finish_access(struct thread *thread) { - unw_addr_space_t addr_space; - if (callchain_param.record_mode != CALLCHAIN_DWARF) return; - addr_space = thread__priv(thread); - unw_destroy_addr_space(addr_space); + unw_destroy_addr_space(thread->addr_space); } static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb, @@ -639,7 +630,9 @@ static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb, * unwind itself. */ if (max_stack - 1 > 0) { - addr_space = thread__priv(ui->thread); + WARN_ONCE(!ui->thread, "WARNING: ui->thread is NULL"); + addr_space = ui->thread->addr_space; + if (addr_space == NULL) return -1; -- 2.5.5