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Tue, 2 Nov 2021 14:39:17 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id OSuzCZVNgWG8MgAAMHmgww (envelope-from ); Tue, 02 Nov 2021 14:39:17 +0000 Message-ID: <5f3b17ae-bff5-fd0f-cd1e-fa481f100149@suse.cz> Date: Tue, 2 Nov 2021 15:39:16 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.1 Subject: Re: [PATCH v2] mm, slub: emit the "free" trace report before freeing memory in kmem_cache_free() Content-Language: en-US To: Tang Yizhou , Yunfeng Ye , cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: jhubbard@nvidia.com, songmuchun@bytedance.com, willy@infradead.org, wuxu.wu@huawei.com, Hewenliang References: From: Vlastimil Babka In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 7BCC6801A89C Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=QVkJPpq3; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=AZYVwT5S; spf=pass (imf06.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none X-Stat-Signature: ssdfzgs7fmkbig9yjcpqirtxcjuqjobq X-HE-Tag: 1635863958-628843 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: On 11/2/21 14:53, Tang Yizhou wrote: > On 2021/11/2 19:43, Yunfeng Ye wrote: >> --- a/mm/slub.c >> +++ b/mm/slub.c >> @@ -3526,8 +3526,8 @@ void kmem_cache_free(struct kmem_cache *s, void *x) >> s = cache_from_obj(s, x); >> if (!s) >> return; >> - slab_free(s, virt_to_head_page(x), x, NULL, 1, _RET_IP_); >> trace_kmem_cache_free(_RET_IP_, x, s->name); >> + slab_free(s, virt_to_head_page(x), x, NULL, 1, _RET_IP_); >> } > > It seems that kmem_cache_free() in mm/slab.c has the same problem. > We can fix it. Thanks. Doh, true. Should go best before the local_irq_save() there. And also kmem_cache_free() in mm/slob.c. Interestingly kfree() is already OK in all 3 implementations. >> EXPORT_SYMBOL(kmem_cache_free); >> >