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From: jeff.xie@linux.dev Message-ID: TLS-Required: No Subject: Re: [RFC][PATCH 4/4] mm/rmap: implement anonmap allocate post callback for page_owner To: "Matthew Wilcox" Cc: akpm@linux-foundation.org, iamjoonsoo.kim@lge.com, vbabka@suse.cz, cl@linux.com, penberg@kernel.org, rientjes@google.com, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, chensong_2000@189.cn, xiehuan09@gmail.com In-Reply-To: References: <20231109032521.392217-1-jeff.xie@linux.dev> <20231109032521.392217-5-jeff.xie@linux.dev> X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 7951E180025 X-Rspam-User: X-Stat-Signature: skhrcnb35x6r6zb119wcpaoxriccq6ph X-Rspamd-Server: rspam03 X-HE-Tag: 1699544872-985566 X-HE-Meta: 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 No4utLco 6jBSwvxXd3rU0fIpBMGzczx75dJVbjAV7hZd3DHeQ3xI8J9xpKduEj52hx0Ft8+ylittavAqNzo4aL3r22F2VMMgJ+nhcfMbfjEjr7selOZ/jBFUCheuGlNDBHqhgwOm6gwNC6HeSeZosJ27bxfMeUdIyTBsDZkhvw1nepVi77/FxKWAkpTw98/ADD/eITTC/aogJlPRSFfNglicKWqhUa+3b2CVHmkjnI66lUI3D+NEMLFZFWUGlQn5/Ly+n64/gJL0soOpW4NR0+QE= 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: List-Subscribe: List-Unsubscribe: November 9, 2023 at 10:10 PM, "Matthew Wilcox" wrot= e: >=20 >=20On Thu, Nov 09, 2023 at 11:25:21AM +0800, Jeff Xie wrote: >=20 >=20>=20 >=20> +static int anon_alloc_post_page_owner(struct folio *folio, struct = task_struct *tsk, > > + void *data, char *kbuf, size_t count) > > +{ > > + int ret; > > + unsigned long address =3D (unsigned long)data; > > + > > + ret =3D scnprintf(kbuf, count, "ANON_PAGE address 0x%lx\n", addres= s); > >=20 >=20 > ... completely ignoring that it might have been mremap() since ... >=20 >=20I'm not an expert on anon memory. I'm sure someone can tell you how t= o > figure out the current address that a folio is mapped at. > I'm currently not sure if the address parameter is the mapped address, so= this is an RFC patchset ;-) __ Jeff Xie