netdev - Re: [PATCH] mm: mempolicy: handle vma with unmovable pages mapped correctly in mbind

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Message-ID: <68b67faf-d1c3-bc36-3db4-c86c6dfd8f11@linux.alibaba.com>
Date:   Wed, 19 Jun 2019 09:39:48 -0700
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...nel.org>
Cc:     akpm@...ux-foundation.org, mgorman@...hsingularity.net,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] mm: mempolicy: handle vma with unmovable pages mapped
 correctly in mbind



On 6/19/19 1:18 AM, Vlastimil Babka wrote:
> On 6/18/19 7:06 PM, Yang Shi wrote:
>> The BUG_ON was removed by commit
>> d44d363f65780f2ac2ec672164555af54896d40d ("mm: don't assume anonymous
>> pages have SwapBacked flag") since 4.12.
> Perhaps that commit should be sent to stable@ ? Although with
> VM_BUG_ON() this is less critical than plain BUG_ON().

I don't think we have to. I agree it is less critical,  VM_DEBUG should 
be not enabled for production environment.

And, it doesn't actually break anything since split_huge_page would just 
return error, and those unmovable pages are silently ignored by isolate.