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b=eZ7xuUxMgK193/vloPthk0DdEqC6xqgVTZ2tv4qrUxfwPflPQeu64Wc1z2ve1i4wC savT8q+JPWhHWAXM9qKH3P2CysPMI+H8NXPMOk/sADqIA6DAB3buTZJnOOAFNZIVcp xtJ59dTw/q73luTZIcB+YnEXt0/P970/6Vyuq487Q7JJzQq94DHiDYCvTEthE3ECZE N0fowb03flN7jgsWj1nNsLjDhfnsVDPtyeENaAqDuX3MlYm8kOFld2pfheQecXSH1X Nt2CNZxpIaNjxZa1plq3c+89EGabUCvao75NbpjqHZXPR3QYDBVULQ6/dbKGkd7p8P lIz9Am9lmbk4w== Date: Wed, 9 Apr 2025 19:28:47 +0300 From: Mike Rapoport To: Jason Gunthorpe Cc: Pratyush Yadav , Changyuan Lyu , linux-kernel@vger.kernel.org, graf@amazon.com, akpm@linux-foundation.org, luto@kernel.org, anthony.yznaga@oracle.com, arnd@arndb.de, ashish.kalra@amd.com, benh@kernel.crashing.org, bp@alien8.de, catalin.marinas@arm.com, dave.hansen@linux.intel.com, dwmw2@infradead.org, ebiederm@xmission.com, mingo@redhat.com, jgowans@amazon.com, corbet@lwn.net, krzk@kernel.org, mark.rutland@arm.com, pbonzini@redhat.com, pasha.tatashin@soleen.com, hpa@zytor.com, peterz@infradead.org, robh+dt@kernel.org, robh@kernel.org, saravanak@google.com, skinsburskii@linux.microsoft.com, rostedt@goodmis.org, tglx@linutronix.de, thomas.lendacky@amd.com, usama.arif@bytedance.com, will@kernel.org, devicetree@vger.kernel.org, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Subject: Re: [PATCH v5 09/16] kexec: enable KHO support for memory preservation Message-ID: References: <20250403114209.GE342109@nvidia.com> <20250403142438.GF342109@nvidia.com> <20250404124729.GH342109@nvidia.com> <20250404143031.GB1336818@nvidia.com> <20250407141626.GB1557073@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250407141626.GB1557073@nvidia.com> X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 4A357C000D X-Stat-Signature: t61qo58476yce56w4rhz96ztufi4fgko X-HE-Tag: 1744216144-648476 X-HE-Meta: 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 JKta3Sqp i6XSYp/JaEPRYatQzgHcBJAH8Kd780vWIpH4thY0bb6R1dXVWfc+9UW5PCcB9tifQuGl2xpVCobXM6uII5LOd5uu4rl1vAdLLmYueKWSVUHQKur+M+c3vfQlmHpxgS+90es7QgplyOBJcRwgKL6/O7oWLzwIGzOpHJktO9zkqTYLAFjoq/hnUzSBzSM/0Tck53DuyM8F/vyKJF4DNHlbQ2BW9VGg2Z6rVRrjDhfAYNr1eguqHroiVmma0j+R/bVc6Q54RscergLk+KkCUr4KpD0vI7LcHocFdSMaP5522E5AeJA7HCDsDZXU7KtenrXxUG585CFKJP6xFEXc= 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: On Mon, Apr 07, 2025 at 11:16:26AM -0300, Jason Gunthorpe wrote: > On Sun, Apr 06, 2025 at 07:11:14PM +0300, Mike Rapoport wrote: > > KHO needs to provide a way to give back an allocated struct page/folio > that can be freed back to the buddy alloactor, of the proper > order. Whatever you call that function it belongs to KHO as it is > KHO's primary responsibility to manage the buddy allocator and the > struct pages. If order is only important for freeing memory back to page allocator, you don't really need it. Freeing contiguous power-of-two number of pages with proper alignment will give the same result, just a tad slower. > Jason > -- Sincerely yours, Mike.