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b=Aoe08CUrjB1qKN3KIDK0zQ4/hDTZrmcaQTUPmLyK/bHWKwjdgnKG9VepTO99yXigc UVChFCzbF1NI2uUpK/V9Um916/iJYf+MSkaqlMCzF3V/FYtDsXSCESVRCfQ55sRzNb vBSTPTAGj8Usif7Iwdh4XNMm9ephMs8oPo2S6Tya+XxGJE1fKp6t7/X0WAYXkRqPAa KczkmzTbCbOhyZWcoCyZeyT7WLBr82JP+O349v+7o0ZAA1tLHlSjCfsiou/zpafqk2 BRDlbEp+74njsAGBlzDGlyYgufscXlxRMGJI79qCw1P8hKDdWtCvEi++awc1nAVdip 0BAN09OnXzfJg== From: Pratyush Yadav To: Pratyush Yadav Cc: Mike Rapoport , Pasha Tatashin , Alexander Graf , Muchun Song , Oscar Salvador , David Hildenbrand , Andrew Morton , Jason Miu , kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 04/12] kho: add callback for table pages In-Reply-To: <2vxzv7ctc38a.fsf@kernel.org> (Pratyush Yadav's message of "Mon, 11 May 2026 18:36:53 +0200") References: <20260429133928.850721-1-pratyush@kernel.org> <20260429133928.850721-5-pratyush@kernel.org> <2vxzv7ctc38a.fsf@kernel.org> Date: Mon, 11 May 2026 18:40:16 +0200 Message-ID: <2vxzik8tc32n.fsf@kernel.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 63F7914000F X-Stat-Signature: 6ahjxmoadoykj8ifis65ra9ige37334p X-HE-Tag: 1778517621-191815 X-HE-Meta: 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 dZgnNms5 SKsJ9NHwr7yeOAAH8bWTD4NVJnsWAhf2sf4QefyL9RGRtTBxJ07GgjdgVO3Id/Mqm04lQPftnvF5ulDmd9w69mJV3OYYmhoVPtLtkEzIKN99KUgaomgiJKx7dTI+f2ZMCvhtH6/YvrOkxPWf+HA7aoobQAjY+tOEc/T0HfkgMbThkSAGsu4oDBrNu5oifjEyIyVeV Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, May 11 2026, Pratyush Yadav wrote: > On Mon, May 11 2026, Mike Rapoport wrote: > >> On Wed, Apr 29, 2026 at 03:39:06PM +0200, Pratyush Yadav wrote: >>> From: "Pratyush Yadav (Google)" >>> >>> The KHO memory preservation radix tree does not mark the table pages >>> themselves as scratch. This is done to avoid a circular dependency where >>> preserving a page can lead of allocating other preserved pages. This >>> means any walker looking for free ranges of memory outside of scratch >>> areas will ignore the table >>> >>> Add a table callback that is invoked for each table page. The callback >> >> A sentence why a table callback helps would be nice here :) > > The main reason is that a later patch will create a radix tree for short > use and will need to destroy it afterwards. This was meant for patch 7. The reason for this one is that kho_extend_scratch() needs to exclude table pages from its free ranges. Will add it. > > Will add that here. > >> >>> is given the physical address of the table page. >>> >>> Signed-off-by: Pratyush Yadav (Google) -- Regards, Pratyush Yadav