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

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Message-ID: <28f69c51-0778-56f3-62fd-172b60a039d8@loongson.cn>
Date:   Fri, 13 May 2022 09:59:07 +0800
From:   maobibo <maobibo@...ngson.cn>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Peter Xu <peterx@...hat.com>, David Hildenbrand <david@...hat.com>,
        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



在 2022/5/13 09:49, Andrew Morton 写道:
> On Fri, 13 May 2022 09:29:07 +0800 maobibo <maobibo@...ngson.cn> wrote:
> 
>>
>>
>>>> and/or changelogging.
>>> Sorry for the late response, the mail is filtered and I did not notice that. The result is not so obvious after bandwidth is improved between nodes, it is only about 1% improvement for specint2006 for 32 core on my box.
>>>
>>> Now I do not see negative effective about this patch unless user wants to keep some cores separated from khugepaged daemon process.
>>
>> Can we provide an extra parameter to let khugepaged daemon scheduling binded to node or freely? If can, I will provide updated patch.
> 
> It has always surprised me that we have a single khugepaged thread.  If
> we had a thread per node, you'd be all fixed up, yes?
yes, it will solve this issue if there is a thread per node, also it can speed up huge page scanning. It should be useful for some workloads in short time like specint.
> 
> Ditto ksmd.