From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753826AbbIOPKx (ORCPT ); Tue, 15 Sep 2015 11:10:53 -0400 Received: from casper.infradead.org ([85.118.1.10]:45117 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753377AbbIOPJO (ORCPT ); Tue, 15 Sep 2015 11:09:14 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Adrian Hunter , Kan Liang , Arnaldo Carvalho de Melo Subject: [PATCH 09/15] perf evlist: Make set_maps() more resilient Date: Tue, 15 Sep 2015 12:08:54 -0300 Message-Id: <1442329740-18042-10-git-send-email-acme@kernel.org> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1442329740-18042-1-git-send-email-acme@kernel.org> References: <1442329740-18042-1-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 From: Adrian Hunter Make perf_evlist__set_maps() more resilient by allowing for the possibility that one or another of the maps isn't being changed and therefore should not be "put". Signed-off-by: Adrian Hunter Acked-by: Jiri Olsa Cc: Kan Liang Link: http://lkml.kernel.org/r/1441699142-18905-9-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/evlist.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 5bd3b49452c6..78ff52ee8788 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -1155,11 +1155,22 @@ out_delete_threads: void perf_evlist__set_maps(struct perf_evlist *evlist, struct cpu_map *cpus, struct thread_map *threads) { - cpu_map__put(evlist->cpus); - evlist->cpus = cpus; + /* + * Allow for the possibility that one or another of the maps isn't being + * changed i.e. don't put it. Note we are assuming the maps that are + * being applied are brand new and evlist is taking ownership of the + * original reference count of 1. If that is not the case it is up to + * the caller to increase the reference count. + */ + if (cpus != evlist->cpus) { + cpu_map__put(evlist->cpus); + evlist->cpus = cpus; + } - thread_map__put(evlist->threads); - evlist->threads = threads; + if (threads != evlist->threads) { + thread_map__put(evlist->threads); + evlist->threads = threads; + } perf_evlist__propagate_maps(evlist); } -- 2.1.0