linux-kernel - Re: [PATCH 06/10] mm: vmscan: demote anon DRAM pages to PMEM node

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Message-ID: <c67d331a-d937-9fb8-9508-320c7cccba5f@intel.com>
Date:   Wed, 27 Mar 2019 13:42:51 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Zi Yan <ziy@...dia.com>
Cc:     Keith Busch <kbusch@...nel.org>,
        Yang Shi <yang.shi@...ux.alibaba.com>, mhocko@...e.com,
        mgorman@...hsingularity.net, riel@...riel.com, hannes@...xchg.org,
        akpm@...ux-foundation.org, "Busch, Keith" <keith.busch@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Wu, Fengguang" <fengguang.wu@...el.com>,
        "Du, Fan" <fan.du@...el.com>, "Huang, Ying" <ying.huang@...el.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/10] mm: vmscan: demote anon DRAM pages to PMEM node

On 3/27/19 1:37 PM, Zi Yan wrote:
> Actually, the migration throughput difference does not come from
> any kernel changes, it is a pure comparison between
> migrate_pages(single 4KB page) and migrate_pages(a list of 4KB
> pages). The point I wanted to make is that Yang’s approach, which
> migrates a list of pages at the end of shrink_page_list(), can
> achieve higher throughput than Keith’s approach, which migrates one
> page at a time in the while loop inside shrink_page_list().

I look forward to seeing the patches.