linux-kernel - Re: [PATCH v11 00/14] Multi-Gen LRU Framework

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Message-ID: <CAOUHufbjFAz6m69YgJ6=gzb5m9=73d9a_FkVfqdb4E47Y368Xg@mail.gmail.com>
Date:   Tue, 7 Jun 2022 16:47:33 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux-MM <linux-mm@...ck.org>, Andi Kleen <ak@...ux.intel.com>,
        Aneesh Kumar <aneesh.kumar@...ux.ibm.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Hillf Danton <hdanton@...a.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...e.de>,
        Michael Larabel <Michael@...haellarabel.com>,
        Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Tejun Heo <tj@...nel.org>, Vlastimil Babka <vbabka@...e.cz>,
        Will Deacon <will@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Kernel Page Reclaim v2 <page-reclaim@...gle.com>
Subject: Re: [PATCH v11 00/14] Multi-Gen LRU Framework

On Tue, May 17, 2022 at 8:05 PM Jens Axboe <axboe@...nel.dk> wrote:
>
> On 5/17/22 7:46 PM, Yu Zhao wrote:
> > TLDR
> > ====
> > The current page reclaim is too expensive in terms of CPU usage and it
> > often makes poor choices about what to evict. This patchset offers an
> > alternative solution that is performant, versatile and
> > straightforward.
>
> Where's the changelog since v10?

Apologies for my laziness.

The changes are mainly nits, e.g., small refactorings, additional
comments, etc.; relatively major ones are:

* VM_BUG_ON() -> VM_WARN_ON_ONCE()
* Removed `depends on !MAXSMP`

There are no bug fixes or structural changes in v11. I do have a bug
fix [1] queued for the coming v12, which I have been benchmarking on
top of 5.19-rc1. So far I see no improvements or regressions, compared
with v10 on top of 5.18-rc1.

[1] https://forum.armbian.com/topic/20018-mglru-patches-to-bring-down-kswapd-cpu-usage