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Content-Language: en-US To: Marco Elver Cc: glider@google.com, dvyukov@google.com, cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org, vbabka@suse.cz, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org References: <20220811072551.2506005-1-imran.f.khan@oracle.com> From: Imran Khan In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: TYCPR01CA0157.jpnprd01.prod.outlook.com (2603:1096:400:2b1::10) To CO1PR10MB4468.namprd10.prod.outlook.com (2603:10b6:303:6c::24) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5d876a6f-5219-43df-bd74-08da7b7881f5 X-MS-TrafficTypeDiagnostic: BYAPR10MB2744:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: fwZIorDMNiLmA5U/vquiUOxE7coOp5LdGGy/0BPRsXuxT4l1Dn7YgJBLdCIWCG9zgOgvzZ9Owxvl4bHD8i49Ern9YTF3GI0Ut0hBKEd/PPmn29BJ2cnIil03Z/kEil0/VtBClG/Woxfi51HB8WvfT1GYd/9GweOrqRBjeUkh3tULW0n4SikjtKCyJeOLsrlXTZSsKqwrO/A/oQ2FjA5PCPrQOY+5kS7OYS1ZSc5ZJW7SJkuFGf02GblijuHgZ+ITFef4n3/DIKvBLwHTEorJ9ziwlD+H48VeQLJ2sTk+ReFVuA0RbO0pilJmhE0H4Po9+qdzyKuRnHqTGQFghBhIG3EQ8H3mos60H5Qdz+amuuJcUxVx155i5IblI36DVT+HmkRtBpLv7ITdherEUBMrKfpPjuXeW71HMYn3F8Ld/q9UpBxdp97MvpLYbfqXt121C2eJl27DqvzZLNEA30n4LxUjaC11grYM+1SYaByPidWBt0k1yphVc4+F/BYPJmDo7M1sUKhVlKhdLJlmvCPlBasZklXQk2mDbLh1o04qVOWhAFIyGO8al8sOx69H8smMCQyUoSPlw/LrYL+Flcc7ELzOwQT2PSQ4x9z49jDOA5FwZ3DPnR5lG+bLzUQvJ99b8JySSrAVZ6C8XsBBg6hZlEVZfPqHw6VwaqVFcd8bXj+bn1Pi5qPrIcYF14jJ4y2oWreUWax35zwPZ5ptlDy8p0lEdJEOgZe/SmP9Nz52zdvCrGNkqai5MpGZH8US7SJqBs1+m+PSyyItU8xBaM/3xYNuUz3Sltwvr/VHHocjoIbIGQTcCykNzrCrpMDQ4JWEfk7JPGzOVuc0aNIINuWM4w== X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CO1PR10MB4468.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(136003)(376002)(39860400002)(366004)(396003)(346002)(66476007)(8676002)(5660300002)(66946007)(66556008)(36756003)(4326008)(31686004)(478600001)(7416002)(186003)(2616005)(8936002)(38100700002)(86362001)(6486002)(53546011)(26005)(6916009)(31696002)(316002)(6666004)(41300700001)(6512007)(83380400001)(2906002)(6506007)(43740500002)(45980500001);DIR:OUT;SFP:1101; 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arc=pass ("microsoft.com:s=arcselector9901:i=1") ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1660208692; a=rsa-sha256; cv=pass; b=L7m7Vun8OHtVZeS4h+5Sos4/udK7NAdAFmpAV58rlEPTW9qkrLL80IrB5vQkK5vEFlMS1t W3rJ1SNurphyZdAKJH+hKpuh2oYGAtw8Sf9mJ8+7VPY9DmcqoqNdMbZgO4gB+e0bEsS4jG oDEmImFLj811vMi5Q40RBkUsLDGAHZY= X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 8479440034 X-Rspam-User: X-Stat-Signature: 7dxgpxz4efo7kbbs6iocqx3za3jrfo4e Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2022-7-12 header.b=XzRxB8on; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b="M0QO/PXk"; dmarc=pass (policy=none) header.from=oracle.com; spf=pass (imf04.hostedemail.com: domain of imran.f.khan@oracle.com designates 205.220.177.32 as permitted sender) smtp.mailfrom=imran.f.khan@oracle.com; arc=pass ("microsoft.com:s=arcselector9901:i=1") X-HE-Tag: 1660208692-35660 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hello, On 11/8/22 6:40 pm, Marco Elver wrote: > On Thu, 11 Aug 2022 at 09:26, Imran Khan wrote: >> >> By default kfence allocation can happen for any slab object, whose size >> is up to PAGE_SIZE, as long as that allocation is the first allocation >> after expiration of kfence sample interval. But in certain debugging >> scenarios we may be interested in debugging corruptions involving >> some specific slub objects like dentry or ext4_* etc. In such cases >> limiting kfence for allocations involving only specific slub objects >> will increase the probablity of catching the issue since kfence pool >> will not be consumed by other slab objects. >> >> This patch introduces a sysfs interface '/sys/kernel/slab//skip_kfence' >> to disable kfence for specific slabs. Having the interface work in this >> way does not impact current/default behavior of kfence and allows us to >> use kfence for specific slabs (when needed) as well. The decision to >> skip/use kfence is taken depending on whether kmem_cache.flags has >> (newly introduced) SLAB_SKIP_KFENCE flag set or not. >> >> Signed-off-by: Imran Khan >> --- >> >> This RFC patch is implementing the sysfs work mentioned in [1]. Since the >> approach taken in [1] was not proper, I am sending this RFC patch as a >> separate change. > > This design is much simpler and looks good to me. Feel free to send as > a non-RFC. > Thanks for reviewing this. I have sent non-RFC version of this change. Thanks, -- Imran