From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 424EBC43381 for ; Fri, 29 Mar 2019 20:41:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0074D2184C for ; Fri, 29 Mar 2019 20:41:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730251AbfC2Ulh (ORCPT ); Fri, 29 Mar 2019 16:41:37 -0400 Received: from terminus.zytor.com ([198.137.202.136]:44705 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730150AbfC2Ulh (ORCPT ); Fri, 29 Mar 2019 16:41:37 -0400 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id x2TKfI1Q3938528 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Fri, 29 Mar 2019 13:41:18 -0700 Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id x2TKfHaN3938525; Fri, 29 Mar 2019 13:41:17 -0700 Date: Fri, 29 Mar 2019 13:41:17 -0700 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: tip-bot for Wei Li Message-ID: Cc: mingo@kernel.org, namhyung@kernel.org, jolsa@kernel.org, huawei.libin@huawei.com, guohanjun@huawei.com, alexander.shishkin@linux.intel.com, liwei391@huawei.com, kim.phillips@arm.com, tglx@linutronix.de, hpa@zytor.com, dsahern@gmail.com, linux-kernel@vger.kernel.org, peterz@infradead.org, acme@redhat.com Reply-To: mingo@kernel.org, huawei.libin@huawei.com, jolsa@kernel.org, namhyung@kernel.org, alexander.shishkin@linux.intel.com, guohanjun@huawei.com, kim.phillips@arm.com, liwei391@huawei.com, hpa@zytor.com, tglx@linutronix.de, peterz@infradead.org, acme@redhat.com, linux-kernel@vger.kernel.org, dsahern@gmail.com In-Reply-To: <20190228092003.34071-1-liwei391@huawei.com> References: <20190228092003.34071-1-liwei391@huawei.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/urgent] perf machine: Update kernel map address and re-order properly Git-Commit-ID: 977c7a6d1e263ff1d755f28595b99e4bc0c48a9f X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 977c7a6d1e263ff1d755f28595b99e4bc0c48a9f Gitweb: https://git.kernel.org/tip/977c7a6d1e263ff1d755f28595b99e4bc0c48a9f Author: Wei Li AuthorDate: Thu, 28 Feb 2019 17:20:03 +0800 Committer: Arnaldo Carvalho de Melo CommitDate: Thu, 28 Mar 2019 14:41:21 -0300 perf machine: Update kernel map address and re-order properly Since commit 1fb87b8e9599 ("perf machine: Don't search for active kernel start in __machine__create_kernel_maps"), the __machine__create_kernel_maps() just create a map what start and end are both zero. Though the address will be updated later, the order of map in the rbtree may be incorrect. The commit ee05d21791db ("perf machine: Set main kernel end address properly") fixed the logic in machine__create_kernel_maps(), but it's still wrong in function machine__process_kernel_mmap_event(). To reproduce this issue, we need an environment which the module address is before the kernel text segment. I tested it on an aarch64 machine with kernel 4.19.25: [root@localhost hulk]# grep _stext /proc/kallsyms ffff000008081000 T _stext [root@localhost hulk]# grep _etext /proc/kallsyms ffff000009780000 R _etext [root@localhost hulk]# tail /proc/modules hisi_sas_v2_hw 77824 0 - Live 0xffff00000191d000 nvme_core 126976 7 nvme, Live 0xffff0000018b6000 mdio 20480 1 ixgbe, Live 0xffff0000018ab000 hisi_sas_main 106496 1 hisi_sas_v2_hw, Live 0xffff000001861000 hns_mdio 20480 2 - Live 0xffff000001822000 hnae 28672 3 hns_dsaf,hns_enet_drv, Live 0xffff000001815000 dm_mirror 40960 0 - Live 0xffff000001804000 dm_region_hash 32768 1 dm_mirror, Live 0xffff0000017f5000 dm_log 32768 2 dm_mirror,dm_region_hash, Live 0xffff0000017e7000 dm_mod 315392 17 dm_mirror,dm_log, Live 0xffff000001780000 [root@localhost hulk]# Before fix: [root@localhost bin]# perf record sleep 3 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.011 MB perf.data (9 samples) ] [root@localhost bin]# perf buildid-list -i perf.data 4c4e46c971ca935f781e603a09b52a92e8bdfee8 [vdso] [root@localhost bin]# perf buildid-list -i perf.data -H 0000000000000000000000000000000000000000 /proc/kcore [root@localhost bin]# After fix: [root@localhost tools]# ./perf/perf record sleep 3 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.011 MB perf.data (9 samples) ] [root@localhost tools]# ./perf/perf buildid-list -i perf.data 28a6c690262896dbd1b5e1011ed81623e6db0610 [kernel.kallsyms] 106c14ce6e4acea3453e484dc604d66666f08a2f [vdso] [root@localhost tools]# ./perf/perf buildid-list -i perf.data -H 28a6c690262896dbd1b5e1011ed81623e6db0610 /proc/kcore Signed-off-by: Wei Li Acked-by: Jiri Olsa Acked-by: Namhyung Kim Cc: Alexander Shishkin Cc: David Ahern Cc: Hanjun Guo Cc: Kim Phillips Cc: Li Bin Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20190228092003.34071-1-liwei391@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/machine.c | 32 ++++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-) diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 61959aba7e27..3c520baa198c 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -1421,6 +1421,20 @@ static void machine__set_kernel_mmap(struct machine *machine, machine->vmlinux_map->end = ~0ULL; } +static void machine__update_kernel_mmap(struct machine *machine, + u64 start, u64 end) +{ + struct map *map = machine__kernel_map(machine); + + map__get(map); + map_groups__remove(&machine->kmaps, map); + + machine__set_kernel_mmap(machine, start, end); + + map_groups__insert(&machine->kmaps, map); + map__put(map); +} + int machine__create_kernel_maps(struct machine *machine) { struct dso *kernel = machine__get_kernel(machine); @@ -1453,17 +1467,11 @@ int machine__create_kernel_maps(struct machine *machine) goto out_put; } - /* we have a real start address now, so re-order the kmaps */ - map = machine__kernel_map(machine); - - map__get(map); - map_groups__remove(&machine->kmaps, map); - - /* assume it's the last in the kmaps */ - machine__set_kernel_mmap(machine, addr, ~0ULL); - - map_groups__insert(&machine->kmaps, map); - map__put(map); + /* + * we have a real start address now, so re-order the kmaps + * assume it's the last in the kmaps + */ + machine__update_kernel_mmap(machine, addr, ~0ULL); } if (machine__create_extra_kernel_maps(machine, kernel)) @@ -1599,7 +1607,7 @@ static int machine__process_kernel_mmap_event(struct machine *machine, if (strstr(kernel->long_name, "vmlinux")) dso__set_short_name(kernel, "[kernel.vmlinux]", false); - machine__set_kernel_mmap(machine, event->mmap.start, + machine__update_kernel_mmap(machine, event->mmap.start, event->mmap.start + event->mmap.len); /*