linux-kernel - Re: [PATCH 10/24] mm/swap: remove nr_rotate

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Message-ID: <CAF8kJuM1xwXdGbE_jpE3mcscYCcxRaA6xL68LGCzC3vDprsTsQ@mail.gmail.com>
Date:   Tue, 21 Nov 2023 07:45:49 -0800
From:   Chris Li <chrisl@...nel.org>
To:     Kairui Song <kasong@...cent.com>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        "Huang, Ying" <ying.huang@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/24] mm/swap: remove nr_rotate_swap and related code

Hi Kairui,

On Sun, Nov 19, 2023 at 11:48 AM Kairui Song <ryncsn@...il.com> wrote:
>
> From: Kairui Song <kasong@...cent.com>
>
> No longer needed after we switched to per entry swap readhead policy.

This is a behavior change patch, better separate out from clean up
series for exposure and discussions.

I think the idea is reasonable. The policy should be made on device
level rather than system level. I saw Ying has some great feedback
regarding readahead cross device boundaries.

Chris