linux-kernel - Re: [PATCH v12 mm-new 07/15] khugepaged: generalize collapse_huge

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Message-ID: <ad974920-658a-4909-8160-c54f7ac9403a@linux.alibaba.com>
Date: Mon, 27 Oct 2025 11:25:33 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: Nico Pache <npache@...hat.com>, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, linux-mm@...ck.org,
 linux-doc@...r.kernel.org
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Subject: Re: [PATCH v12 mm-new 07/15] khugepaged: generalize
 collapse_huge_page for mTHP collapse



On 2025/10/23 02:37, Nico Pache wrote:
> Pass an order and offset to collapse_huge_page to support collapsing anon
> memory to arbitrary orders within a PMD. order indicates what mTHP size we
> are attempting to collapse to, and offset indicates were in the PMD to
> start the collapse attempt.
> 
> For non-PMD collapse we must leave the anon VMA write locked until after
> we collapse the mTHP-- in the PMD case all the pages are isolated, but in
> the mTHP case this is not true, and we must keep the lock to prevent
> changes to the VMA from occurring.
> 
> Signed-off-by: Nico Pache <npache@...hat.com>
> ---

LGTM. And passed my mTHP collapse testing cases. So:
Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
Tested-by: Baolin Wang <baolin.wang@...ux.alibaba.com>