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Sun, 01 Dec 2024 13:37:50 +0800 From: "Huang, Ying" To: Andrew Morton , Kefeng Wang Cc: David Hildenbrand , Matthew Wilcox , "Muchun Song" , , Zi Yan Subject: Re: [PATCH v2 1/2] mm: use aligned address in clear_gigantic_page() In-Reply-To: <20241130181546.0d4d95e2ad9c0be707f54a50@linux-foundation.org> (Andrew Morton's message of "Sat, 30 Nov 2024 18:15:46 -0800") References: <20241026054307.3896926-1-wangkefeng.wang@huawei.com> <54f5f3ee-8442-4c49-ab4e-c46e8db73576@huawei.com> <4219a788-52ad-4d80-82e6-35a64c980d50@redhat.com> <127d4a00-29cc-4b45-aa96-eea4e0adaed2@huawei.com> <9b06805b-4f4f-4b37-861f-681e3ab9d470@huawei.com> <113d3cb9-0391-48ab-9389-f2fd1773ab73@redhat.com> <878qu6wgcm.fsf@yhuang6-desk2.ccr.corp.intel.com> <87sese9sy9.fsf@yhuang6-desk2.ccr.corp.intel.com> <64f1c69d-3706-41c5-a29f-929413e3dfa2@huawei.com> <87v7x88y3q.fsf@yhuang6-desk2.ccr.corp.intel.com> <20241130181546.0d4d95e2ad9c0be707f54a50@linux-foundation.org> Date: Sun, 01 Dec 2024 13:37:41 +0800 Message-ID: <87ser8c6ai.fsf@DESKTOP-5N7EMDA> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset=ascii X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: CE6E340008 X-Rspam-User: X-Stat-Signature: g881xkq3z87c6j9aihf5u9auwn9bbzpc X-HE-Tag: 1733031464-724341 X-HE-Meta: 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 g0YEYf0t P1dgloLnGxHqjJfh8Gj6SZ7H1G8R1y1dKZApOxA3bru65NH4cX8bCkIRjU4O4IaqdYTGLv6eb3+E2Zdoyx1F6J2lVzmEIGg/u6qroFgnVNoV29pIyvFAcKGu7H8gyZznoLgMZvLO7Np9Ug73DdruISOEFdNxfGAKfspXeN8GqRy0Tm+pSCyCVsa8WfsB5wWrWInTdqP0PceFJ6uHaKZCmleXSu1jQ/tDPBstQxzCP9eedqLONI+xeHObEPMhubFlEvhDdsf8nCCySpTEhrMr3i2fGgdXZG5KW7oISoIJVCd5IoRsOapM5gZhhpmNMzCqial3Z6sEyk+h0UtQUH6FGlUv4xA== 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: Hi, Andrew, Andrew Morton writes: > On Thu, 31 Oct 2024 16:39:53 +0800 "Huang, Ying" wrote: > >> However, on ARM64, it does introduce some regression for clearing pages >> from end to start. That needs to be addressed. I guess that the >> regression can be resolved via using more clearing from start to end >> (but not all). For example, can you take a look at the patch below? >> Which uses the similar framework as before, but clear each small trunk >> (mpage) from start to end. You can adjust MPAGE_NRPAGES to check when >> the regression can be restored. >> >> WARNING: the patch is only build tested. > > I'm holding this patch in mm-unstable because it's unclear (to me) that > this regression has been adequately addressed? Yes. This patch isn't ready to be merged yet. More works are needed to root cause the problem and implement the proper fix. I guess that Kefeng will continue to work on this. --- Best Regards, Huang, Ying