Re: [RESEND stable 5.4] mm: swap: properly update readahead statistics in unuse_pte_range()

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On Fri, Feb 03, 2023 at 02:36:22PM +0000, Luiz Capitulino wrote:
> From: Andrea Righi <andrea.righi@xxxxxxxxxxxxx>
> 
> Commit ebc5951eea499314f6fbbde20e295f1345c67330 upstream.
> 
> [ This fixes a performance issue we're seeing in AWS instances when
>   running swapoff and using the global readahead algorithm. For a
>   particular instance configuration, Without this fix I/O throughput
>   is very low during swapoff (about 15 MB/s) with this patch is
>   reaches 500 MB/s. Tested swapoff with different workloads with
>   this patch applied. 5.10 onwards already have this fix ]

Now queued up, thanks.

greg k-h



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