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[2003:d8:2f3c:3a00:5662:26b3:3e5d:438e]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-454dd541a59sm44199145e9.32.2025.07.11.04.39.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 11 Jul 2025 04:39:28 -0700 (PDT) Message-ID: Date: Fri, 11 Jul 2025 13:39:26 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 12/14] mm: add config option for clearing page-extents To: Ankur Arora , linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Cc: akpm@linux-foundation.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, mjguzik@gmail.com, luto@kernel.org, peterz@infradead.org, acme@kernel.org, namhyung@kernel.org, tglx@linutronix.de, willy@infradead.org, raghavendra.kt@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com References: <20250710005926.1159009-1-ankur.a.arora@oracle.com> <20250710005926.1159009-13-ankur.a.arora@oracle.com> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10.07.25 02:59, Ankur Arora wrote: > Add CONFIG_CLEAR_PAGE_EXTENT to allow clearing of page-extents > where architecturally supported. > > This is only available with !CONFIG_HIGHMEM because the intent is to > use architecture support to clear contiguous extents in a single > operation (ex. via FEAT_MOPS on arm64, string instructions on x86) > which excludes any possibility of interspersing kmap()/kunmap(). > > Signed-off-by: Ankur Arora > --- > mm/Kconfig | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/mm/Kconfig b/mm/Kconfig > index 781be3240e21..a74a5e02de28 100644 > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -910,6 +910,15 @@ config NO_PAGE_MAPCOUNT > > endif # TRANSPARENT_HUGEPAGE > > +config CLEAR_PAGE_EXTENT > + def_bool y > + depends on !HIGHMEM && ARCH_HAS_CLEAR_PAGES > + depends on TRANSPARENT_HUGEPAGE || HUGETLBFS > + > + help > + Use architectural support for clear_pages() to zero page-extents. > + This is likely to be faster than zeroing page-at-a-time. > + IIRC, adding a help text will make this option be configurable by the user, no? This seems like something we can just keep internal, right? -- Cheers, David / dhildenb