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Fri, 30 May 2025 16:23:58 -0700 (PDT) Date: Fri, 30 May 2025 23:23:58 +0000 From: Wei Yang To: David Hildenbrand Cc: Wei Yang , Lorenzo Stoakes , akpm@linux-foundation.org, riel@surriel.com, vbabka@suse.cz, harry.yoo@oracle.com, jannh@google.com, baohua@kernel.org, linux-mm@kvack.org Subject: Re: [RFC Patch 0/5] Make anon_vma operations testable Message-ID: <20250530232358.yjx4yqxicvsbvgjw@master> Reply-To: Wei Yang References: <20250429235608.yvbcxybkfsmp6ow5@master> <20250514012318.2impqotf65p4ihsc@master> <20250527063428.4ykrdtive2hfnqdp@master> <40dc48f9-94d7-46b0-83ed-d3511789c15a@redhat.com> <20250530021112.6b2ldosl3hvhcnvq@master> <20250530140521.tnyjxdsy6qa6dokl@master> <253705b2-a9bb-47a0-94e5-1aeafcca0396@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <253705b2-a9bb-47a0-94e5-1aeafcca0396@redhat.com> User-Agent: NeoMutt/20170113 (1.7.2) X-Rspamd-Queue-Id: CEFA880004 X-Stat-Signature: 5qj7y4yc315qa8b8gfh4m4cc8pomx315 X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1748647440-751880 X-HE-Meta: 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 EwCAT7WM 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 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 Fri, May 30, 2025 at 04:39:21PM +0200, David Hildenbrand wrote: [...] >> >> Here you mean for all anon/shmem/pagecache pages, we could have two category >> tests: >> >> * migrate and write different data from on process, verify each process see >> new data >> * trigger pageout from one process, verify each process has it pageout >> (/proc/self/pagemap) >> >> While one of these category is enough, right? Just like KSM below, migrate or >> pageout. > >Both cases will trigger different code paths: for example, migration will >trigger restoring of migration entries, which is a different rmap operation >not triggered by pageout/pagein :) > >Pageout is probably easier to implement: but we couldn't test hugetlb. With >migration we probably could also test hugetlb rmap code (yet another case we >should probably cover). > Oh, the pageout/pagein here is the madvise(MADV_PAGEOUT) one you mention in your previous reply? I thought you propose another scenario. Sorry for not following your message. >-- >Cheers, > >David / dhildenb -- Wei Yang Help you, Help me