linux-kernel - Re: [PATCH v2 0/1] mm: introduce MADV_DEMOTE/MADV

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Message-ID: <2a74db22-f2a4-4a14-8091-1e56962a6fa8@redhat.com>
Date: Thu, 1 Aug 2024 15:05:53 +0200
From: David Hildenbrand <david@...hat.com>
To: Zhangrenze <zhang.renze@....com>, "linux-mm@...ck.org"
 <linux-mm@...ck.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Cc: "arnd@...db.de" <arnd@...db.de>,
 "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
 "chris@...kel.net" <chris@...kel.net>,
 "jcmvbkbc@...il.com" <jcmvbkbc@...il.com>,
 "James.Bottomley@...senPartnership.com"
 <James.Bottomley@...senPartnership.com>, "deller@....de" <deller@....de>,
 "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
 "tsbogend@...ha.franken.de" <tsbogend@...ha.franken.de>,
 "rdunlap@...radead.org" <rdunlap@...radead.org>,
 "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
 "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
 "richard.henderson@...aro.org" <richard.henderson@...aro.org>,
 "ink@...assic.park.msu.ru" <ink@...assic.park.msu.ru>,
 "mattst88@...il.com" <mattst88@...il.com>,
 "linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>,
 Jiaoxupo <jiaoxupo@....com>, Zhouhaofan <zhou.haofan@....com>
Subject: Re: [PATCH v2 0/1] mm: introduce MADV_DEMOTE/MADV_PROMOTE

>> 4. MADV_DEMOTE and MADV_PROMOTE provide a better balance between capacity
>>      and latency. They allow hot pages that need promoting to be promoted
>>      smoothly and pages that need demoting to be demoted immediately. This
>>      helps tiered memory systems to operate more rationally.
> 
> Can you summarize why something similar could not be provided by a
> library that builds up on existing functionality, such as migrate_pages?

Sorry, I actually wanted to refer to "move_pages", not "migrate_pages".

-- 
Cheers,

David / dhildenb