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Mon, 3 Apr 2023 10:41:46 -0400 (EDT) Received: by box.shutemov.name (Postfix, from userid 1000) id 29EE210D7B3; Mon, 3 Apr 2023 17:41:45 +0300 (+03) Date: Mon, 3 Apr 2023 17:41:45 +0300 From: "Kirill A. Shutemov" To: Vlastimil Babka Cc: "Kirill A. Shutemov" , Borislav Petkov , Andy Lutomirski , Sean Christopherson , Andrew Morton , Joerg Roedel , Ard Biesheuvel , Andi Kleen , Kuppuswamy Sathyanarayanan , David Rientjes , Tom Lendacky , Thomas Gleixner , Peter Zijlstra , Paolo Bonzini , Ingo Molnar , Dario Faggioli , Dave Hansen , Mike Rapoport , David Hildenbrand , Mel Gorman , marcelo.cerri@canonical.com, tim.gardner@canonical.com, khalid.elmously@canonical.com, philip.cox@canonical.com, aarcange@redhat.com, peterx@redhat.com, x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCHv9 04/14] mm/page_alloc: Add sysfs handle to accept accept_memory Message-ID: <20230403144145.wss3nudvyyd4xtih@box.shutemov.name> References: <20230330114956.20342-1-kirill.shutemov@linux.intel.com> <20230330114956.20342-5-kirill.shutemov@linux.intel.com> <4c319a60-c1fb-fe43-65be-9729f0261dab@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4c319a60-c1fb-fe43-65be-9729f0261dab@suse.cz> X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 150FE2001E X-Rspam-User: X-Stat-Signature: wcieoit9hj1k4xuixnunzjokzmye3nng X-HE-Tag: 1680532911-40466 X-HE-Meta: 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 lEWE4f/G Slr41JZqTvrGEMY7u2oXyjBAN1XxYJd1FrEMxdEKH7eGIsehaWpn/vzHxQMvTGgYQHtqJodPcqvPRjmthLo20WEDCgfWZ4MdJOb+5FpgpNNg/w2ME9+5A5udrOr/SLum8mVeH9gJ1IZ2pjQj96SH+r/OTvuuMj2tlhBhBFH+2vBZAoDi6BO3M7CPAirjzFpLiwFD5OSSJDHj0ScNoXkrbhVGLdcHxilYobsl6s1UmPUDouPSwpL4lHCNMCDj35hRi6XKuDmybMmz+UNAhYvjJy1A4/DgpDDho/PThrMbgLOuAiPVl7l3hhSRf2MMb46MoQelTNoSIJArRAuIoHWR8a9JC1j/yUje3L4iqJW0YQ4Q6OPeIla2iDkgRICciAHWoNDqJ 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 Mon, Apr 03, 2023 at 03:43:32PM +0200, Vlastimil Babka wrote: > On 3/30/23 13:49, Kirill A. Shutemov wrote: > > Write amount of memory to accept into the new sysfs handle > > /sys/kernel/mm/page_alloc/accept_memory. > > > > Write 'all' to the handle to accept all memory in the system. > > > > It can be used to implement background memory accepting from userspace. > > It is also useful for debugging. > > > > Signed-off-by: Kirill A. Shutemov > > Somewhat similarly to patch 3, I'd think we don't need this patch in > mainline without clear usecases first, although it's good to post for > testing/debugging. I thought about it as a way to implement #3 from 02/14 commit message: users who want to accept all memory in background can use the mechanism. But, again, we can leave out until later. -- Kiryl Shutsemau / Kirill A. Shutemov