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Message-ID: <b3601f0d-c315-4763-bbab-4174fe0af713@kernel.org>
Date: Thu, 7 Mar 2024 09:07:01 +0800
From: Chao Yu <chao@...nel.org>
To: Gao Xiang <hsiangkao@...ux.alibaba.com>, linux-erofs@...ts.ozlabs.org
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] erofs: apply proper VMA alignment for memory mapped files
on THP
On 2024/3/6 14:51, Gao Xiang wrote:
>
>
> On 2024/3/6 13:31, Gao Xiang wrote:
>> There are mainly two reasons that thp_get_unmapped_area() should be
>> used for EROFS as other filesystems:
>>
>> - It's needed to enable PMD mappings as a FSDAX filesystem, see
>> commit 74d2fad1334d ("thp, dax: add thp_get_unmapped_area for pmd
>> mappings");
>>
>> - It's useful together with CONFIG_READ_ONLY_THP_FOR_FS which enables
>> THPs for read-only mmapped files (e.g. shared libraries) even without
>> FSDAX. See commit 1854bc6e2420 ("mm/readahead: Align file mappings
>> for non-DAX").
>
> Refine this part as
>
> - It's useful together with large folios and CONFIG_READ_ONLY_THP_FOR_FS
> which enable THPs for mmapped files (e.g. shared libraries) even without
> ...
>
>>
>> Fixes: 06252e9ce05b ("erofs: dax support for non-tailpacking regular file")
>
> Fixes: ce529cc25b18 ("erofs: enable large folios for iomap mode")
> Fixes: be62c5198861 ("erofs: enable large folios for fscache mode")
>
>> Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
Reviewed-by: Chao Yu <chao@...nel.org>
Thanks,
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