From patchwork Wed Aug 2 13:09:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Leizhen (ThunderTown)" X-Patchwork-Id: 13338151 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3F9FC41513 for ; Wed, 2 Aug 2023 13:09:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232556AbjHBNJe (ORCPT ); Wed, 2 Aug 2023 09:09:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49910 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231176AbjHBNJd (ORCPT ); Wed, 2 Aug 2023 09:09:33 -0400 Received: from dggsgout12.his.huawei.com (unknown [45.249.212.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D0527268E; Wed, 2 Aug 2023 06:09:30 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.30.67.143]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4RGC431vmCz4f3nwj; Wed, 2 Aug 2023 21:09:23 +0800 (CST) Received: from huaweicloud.com (unknown [10.174.178.55]) by APP4 (Coremail) with SMTP id gCh0CgAHvbCBVcpkDKSVPQ--.59231S4; Wed, 02 Aug 2023 21:09:24 +0800 (CST) From: thunder.leizhen@huaweicloud.com To: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Vlastimil Babka , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-mm@kvack.org, "Paul E . McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Zqiang , rcu@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Zhen Lei Subject: [PATCH v4 0/2] rcu: Dump memory object info if callback function is invalid Date: Wed, 2 Aug 2023 21:09:16 +0800 Message-Id: <20230802130918.1132-1-thunder.leizhen@huaweicloud.com> X-Mailer: git-send-email 2.37.3.windows.1 MIME-Version: 1.0 X-CM-TRANSID: gCh0CgAHvbCBVcpkDKSVPQ--.59231S4 X-Coremail-Antispam: 1UD129KBjvJXoW7ZFWfXrW8KrWrCr4rXry8Grg_yoW8Gw13pw nxW3sxWr15Jry3CF13ZF1Ikry5Gay8KFsIk3ZxZws5Zw15Zr97uFykJr1IqF9xGF97K3W0 ya1YkF1jkr4DArDanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvYb4IE77IF4wAFF20E14v26ryj6rWUM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6r1S6rWUM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4 vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7Cj xVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x 0267AKxVW0oVCq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG 6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFV Cjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4IIrI8v6xkF7I0E8cxan2IY04v7M4kE6xkI j40Ew7xC0wCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F4 0E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_GFv_Wryl IxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxV AFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6rW3Jr0E3s1lIxAIcVC2z280aVAFwI0_ Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8Jr0_Cr1UYxBIdaVFxhVjvjDU0xZFpf9x07 UKfO7UUUUU= X-CM-SenderInfo: hwkx0vthuozvpl2kv046kxt4xhlfz01xgou0bp/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: Zhen Lei v3 --> v4: 1. Remove kmem_valid_obj() and convert kmem_dump_obj() to work the same way as vmalloc_dump_obj(). 2. In kernel/rcu/rcu.h -#include +#include v2 --> v3: 1. I made statistics about the source of 'rhp'. kmem_valid_obj() accounts for more than 97.5%, and vmalloc accounts for less than 1%. So change call mem_dump_obj() to call kmem_dump_obj() can meet debugging requirements and avoid the potential deadlock risk of vmalloc_dump_obj(). - mem_dump_obj(rhp); + if (kmem_valid_obj(rhp)) + kmem_dump_obj(rhp); The discussion about vmap_area_lock deadlock in v2: https://lkml.org/lkml/2022/11/11/493 2. Provide static inline empty functions for kmem_valid_obj() and kmem_dump_obj() when CONFIG_PRINTK=n. v1 --> v2: 1. Remove condition "(unsigned long)rhp->func & 0x3", it have problems on x86. 2. Paul E. McKenney helped me update the commit message, thanks. Zhen Lei (2): mm: Remove kmem_valid_obj() rcu: Dump memory object info if callback function is invalid include/linux/slab.h | 5 +++-- kernel/rcu/rcu.h | 7 +++++++ kernel/rcu/srcutiny.c | 1 + kernel/rcu/srcutree.c | 1 + kernel/rcu/tasks.h | 1 + kernel/rcu/tiny.c | 1 + kernel/rcu/tree.c | 1 + mm/slab_common.c | 41 +++++++++++------------------------------ mm/util.c | 4 +--- 9 files changed, 27 insertions(+), 35 deletions(-)