linux-kernel - Re: [PATCH v1 1/6] fs/proc/task_mmu: indicate PM

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Message-ID: <ZmaBycvnd0pQswET@localhost.localdomain>
Date: Mon, 10 Jun 2024 06:32:09 +0200
From: Oscar Salvador <osalvador@...e.de>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-doc@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v1 1/6] fs/proc/task_mmu: indicate PM_FILE for PMD-mapped
 file THP

On Fri, Jun 07, 2024 at 02:23:52PM +0200, David Hildenbrand wrote:
> Looks like we never taught pagemap_pmd_range() about the existence of
> PMD-mapped file THPs. Seems to date back to the times when we first added
> support for non-anon THPs in the form of shmem THP.
> 
> Fixes: 800d8c63b2e9 ("shmem: add huge pages support")
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Signed-off-by: David Hildenbrand <david@...hat.com>

Reviewed-by: Oscar Salvador <osalvador@...e.de>

> ---
>  fs/proc/task_mmu.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 5aceb3db7565e..08465b904ced5 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -1522,6 +1522,8 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
>  		}
>  #endif
>  
> +		if (page && !PageAnon(page))
> +			flags |= PM_FILE;
>  		if (page && !migration && page_mapcount(page) == 1)
>  			flags |= PM_MMAP_EXCLUSIVE;
>  
> -- 
> 2.45.2
> 
> 

-- 
Oscar Salvador
SUSE Labs