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(p200300cbc70dee00b271fb6ca9314769.dip0.t-ipconnect.de. [2003:cb:c70d:ee00:b271:fb6c:a931:4769]) by smtp.gmail.com with ESMTPSA id 20-20020a05600c22d400b004054dcbf92asm981775wmg.20.2023.10.12.02.31.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 12 Oct 2023 02:31:20 -0700 (PDT) Message-ID: <0feef130-59dd-0a31-ed06-e3849a52c75e@redhat.com> Date: Thu, 12 Oct 2023 11:31:19 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 Subject: Re: [PATCH v6 4/9] mm: thp: Introduce anon_orders and anon_always_mask sysfs files To: Andrew Morton , Michael Ellerman Cc: Ryan Roberts , "Aneesh Kumar K.V" , Matthew Wilcox , Yin Fengwei , Yu Zhao , Catalin Marinas , Anshuman Khandual , Yang Shi , "Huang, Ying" , Zi Yan , Luis Chamberlain , Itaru Kitayama , "Kirill A. Shutemov" , John Hubbard , David Rientjes , Vlastimil Babka , Hugh Dickins , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org References: <20230929114421.3761121-1-ryan.roberts@arm.com> <20230929114421.3761121-5-ryan.roberts@arm.com> <20230929155530.a51e68e03e47a06b6b84c689@linux-foundation.org> <87fs2mrqld.fsf@mail.lhotse> <20231009172029.e558c08dd90d9b94fec3a036@linux-foundation.org> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20231009172029.e558c08dd90d9b94fec3a036@linux-foundation.org> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231012_023125_279925_EAAEFB12 X-CRM114-Status: GOOD ( 11.30 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 10.10.23 02:20, Andrew Morton wrote: > On Sun, 08 Oct 2023 09:54:22 +1100 Michael Ellerman wrote: > >>> I don't know why powerpc's PTE_INDEX_SIZE is variable. >> >> To allow a single vmlinux to boot using either the Hashed Page Table >> MMU, or Radix Tree MMU, which have different page table geometry. >> >> That's a pretty crucial feature for distros, so that they can build a >> single kernel to boot on Power8/9/10. > > Dumb question: why can't distros ship two kernels and have the boot > loader (or something else) pick the appropriate one? One answer I keep hearing over and over again is "test matrix explosion". So distros only do it when unavoidable: for example, when differing PAGE_SIZE is required (e.g., 4k vs 64k) or we're dealing with RT support (RT vs !RT). -- Cheers, David / dhildenb _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel