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

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Message-Id: <20220512184908.0852e1efcb6fd78aea52b557@linux-foundation.org>
Date:   Thu, 12 May 2022 18:49:08 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     maobibo <maobibo@...ngson.cn>
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

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?

Ditto ksmd.