linux-kernel - Re: [PATCH v4 1/4] mm: reduce the rcu lock duration

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Message-ID: <5abc85bc-fec7-afbf-4ec4-90c1385195d2@huawei.com>
Date:   Sat, 18 Jun 2022 10:49:44 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Ying Huang <ying.huang@...el.com>, <peterx@...hat.com>,
        <apopple@...dia.com>, <osalvador@...e.de>,
        <mike.kravetz@...cle.com>, <songmuchun@...edance.com>,
        <hch@....de>, <dhowells@...hat.com>, <cl@...ux.com>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <naoya.horiguchi@....com>
Subject: Re: [PATCH v4 1/4] mm: reduce the rcu lock duration

On 2022/6/18 8:23, Andrew Morton wrote:
> On Tue, 7 Jun 2022 17:19:53 +0800 Miaohe Lin <linmiaohe@...wei.com> wrote:
> 
>>>
>>>
>>> If the checks are not made to guarantee they are all checking against
>>> the same mm, the code needs a comment to say that there is a tiny race.
>>> The comment should say we don't care about the tiny race because
>>> the worst that can happen is that a page is migrated to a different
>>> numa node.  And so we don't care.
>>>
>>>
>>
>> I tend to do this one. To make sure, is the below code change what you suggest?
> 
> Eric went quiet.
> 
> As I understand it, any changes arising from this discussion can be
> done as a followup patch.  So I'm planning on moving this 4-patch
> series into the non-rebasing mm-stable branch late next week.

I will send a followup patch when discussion is done. Thanks.

> 
> 
> .
>