linux-kernel - Re: [PATCH v3] mm/khugepaged: sched to numa node when collapse huge page

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Message-ID: <0c716a6b-c09c-f02c-a42a-9c8dc13518aa@redhat.com>
Date:   Thu, 28 Apr 2022 12:07:11 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Bibo Mao <maobibo@...ngson.cn>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Yang Shi <shy828301@...il.com>
Subject: Re: [PATCH v3] mm/khugepaged: sched to numa node when collapse huge
 page

On 27.04.22 22:48, Andrew Morton wrote:
> On Thu, 17 Mar 2022 02:50:24 -0400 Bibo Mao <maobibo@...ngson.cn> wrote:
> 
>> collapse huge page will copy huge page from general small pages,
>> dest node is calculated from most one of source pages, however
>> THP daemon is not scheduled on dest node. The performance may be
>> poor since huge page copying across nodes, also cache is not used
>> for target node. With this patch, khugepaged daemon switches to
>> the same numa node with huge page. It saves copying time and makes
>> use of local cache better.
>>
>> With this patch, specint 2006 base performance is improved with 6%
>> on Loongson 3C5000L platform with 32 cores and 8 numa nodes.
>>
> 
> Are there any acks for this one please?

I'll have a look!


-- 
Thanks,

David / dhildenb