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Fri, 21 May 2021 11:39:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org C8790C433D3 Subject: Re: [PATCH v6] mm: slub: move sysfs slab alloc/free interfaces to debugfs To: Vlastimil Babka , cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, glittao@gmail.com, greg@kroah.com Cc: vinmenon@codeaurora.org References: <1621341949-26762-1-git-send-email-faiyazm@codeaurora.org> From: Faiyaz Mohammed Message-ID: Date: Fri, 21 May 2021 17:09:32 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 8E45CC0042E5 Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=mg.codeaurora.org header.s=smtp header.b=Ur3192C5; spf=pass (imf14.hostedemail.com: domain of bounce@mg.codeaurora.org designates 198.61.254.9 as permitted sender) smtp.mailfrom=bounce@mg.codeaurora.org; dmarc=none X-Rspamd-Server: rspam04 X-Stat-Signature: p9ni7neruf4eb1t1dudqeyj77ig1j7z5 X-HE-Tag: 1621597213-487506 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 5/21/2021 4:43 PM, Vlastimil Babka wrote: > On 5/18/21 2:45 PM, Faiyaz Mohammed wrote: >> alloc_calls and free_calls implementation in sysfs have two issues, >> one is PAGE_SIZE limitiation of sysfs and other is it does not adhere >> to "one value per file" rule. >> >> To overcome this issues, move the alloc_calls and free_calls implemeation >> to debugfs. >> >> Rename the alloc_calls/free_calls to alloc_traces/free_traces, >> to be inline with what it does. >> >> Reported-by: kernel test robot >> Reported-by: Dan Carpenter >> Signed-off-by: Faiyaz Mohammed > > >> @@ -5817,6 +5769,249 @@ static int __init slab_sysfs_init(void) >> __initcall(slab_sysfs_init); >> #endif /* CONFIG_SYSFS */ >> >> +#if defined(CONFIG_SLUB_DEBUG) && defined(CONFIG_DEBUG_FS) >> +static int debugfs_slab_alias(struct kmem_cache *s, const char *name) >> +{ >> + struct saved_alias *al; >> + struct dentry *slab_cache_dir; >> + >> + if (slab_state == FULL) { >> + /* >> + * If we have a leftover link then remove it. >> + */ >> + slab_cache_dir = debugfs_lookup(s->name, slab_debugfs_root); >> + debugfs_remove(slab_cache_dir); >> + debugfs_create_symlink(name, slab_debugfs_root, NULL); > > v6 got stuck on boot for me, unlike v5, seems like here you should return 0? > That helped > oh, it worked me without return, but I think yes, have to return from here once the symlink is created like sysfs_slab_alias do. I will update in next patch version. >> + } >> + >> + al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL); >> + if (!al) >> + return -ENOMEM; >> + >> + al->s = s; >> + al->name = name; >> + al->next = alias_list; >> + alias_list = al; >> + return 0; >> +} >> + Thanks and regards, Mohammed Faiyaz