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Date: Tue, 18 Jun 2024 15:52:45 +0800 From: Qi Zheng <zhengqi.arch@...edance.com> To: David Hildenbrand <david@...hat.com> Cc: Qi Zheng <zhengqi.arch@...edance.com>, hughd@...gle.com, willy@...radead.org, mgorman@...e.de, muchun.song@...ux.dev, akpm@...ux-foundation.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [RFC PATCH 0/3] asynchronously scan and free empty user PTE pages On 2024/6/18 01:51, David Hildenbrand wrote: > On 14.06.24 05:32, Qi Zheng wrote: >> Hi David, >> >> How about starting with this: >> >> a. for MADV_DONTNEED case, try synchronous reclaim as you said >> b. for MADV_FREE case, add a madvise(MADV_PT_RECLAIM) option to mark >> this vma, then add its corresponding mm to a global list, and then >> traverse the list and reclaim it when the memory is tight and enters >> the system reclaim path. >> >> (If this option is for synchronous reclaim as you said, then the >> user-mode program may need to start a thread to make a cyclic call. >> I'm not sure if this usage makes sense. If so, I can also implement >> such an option.) >> c. for s390 case you mentioned, maybe we can set a CONFIG_FREE_PT first, >> and then s390 will not select this config until the problem is >> solved. > > CONFIG_PT_RECLAIM or sth. like that, that would depend on > CONFIG_ARCH_SUPPORTS_PT_RECLAIM. > > Then we can start with what we know works and was tested (e.g., x86). OK, will do. >
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