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Subject: Re: [PATCH] mm: migrate.c: migrate PG_readahead flag
To:     Yang Shi <yang.shi@linux.alibaba.com>, willy@infradead.org,
        mhocko@suse.com, akpm@linux-foundation.org
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org
References: <1581640185-95731-1-git-send-email-yang.shi@linux.alibaba.com>
From:   David Hildenbrand <david@redhat.com>
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Organization: Red Hat GmbH
Message-ID: <5178c119-778a-7a17-e047-6954cb00d4a0@redhat.com>
Date:   Fri, 14 Feb 2020 11:04:22 +0100
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On 14.02.20 01:29, Yang Shi wrote:
> Currently migration code doesn't migrate PG_readahead flag.
> Theoretically this would incur slight performance loss as the
> application might have to ramp its readahead back up again.  Even though
> such problem happens, it might be hidden by something else since
> migration is typically triggered by compaction and NUMA balancing, any
> of which should be more noticeable.
> 
> Migrate the flag after end_page_writeback() since it may clear
> PG_reclaim flag, which is the same bit as PG_readahead, for the new
> page.
> 
> Cc: Matthew Wilcox <willy@infradead.org>
> Cc: Michal Hocko <mhocko@suse.com>
> Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
> ---
> I didn't experience any real problem, found by visual inspection. And, this was
> discussed in thread: https://lore.kernel.org/linux-mm/185ce762-f25d-a013-6daa-8c288f1ff791@linux.alibaba.com/T/#m1977ce1de513401b7d09d6fa14fcffe849580aae
> 
>  mm/migrate.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/mm/migrate.c b/mm/migrate.c
> index edf42ed..f3c492d 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -647,6 +647,14 @@ void migrate_page_states(struct page *newpage, struct page *page)
>  	if (PageWriteback(newpage))
>  		end_page_writeback(newpage);
>  
> +	/*
> +	 * PG_readahead share the same bit with PG_reclaim, the above
> +	 * end_page_writeback() may clear PG_readahead mistakenly, so set
> +	 * the bit after that.
> +	 */
> +	if (PageReadahead(page))
> +		SetPageReadahead(newpage);
> +
>  	copy_page_owner(page, newpage);
>  
>  	mem_cgroup_migrate(page, newpage);
> 

Looks good to me!

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 
Thanks,

David / dhildenb