Subject: Re: [PATCH v6 0/9] Multigenerational LRU Framework

From: Yu Zhao <[email-masked]>
Date: Tue, 4 Jan 2022 13:30:00 -0700

On Tue, Jan 04, 2022 at 01:22:19PM -0700, 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.

<snipped>

> Summery
> =======
> The facts are:
> 1. The independent lab results and the real-world applications
>    indicate substantial improvements; there are no known regressions.
> 2. Thrashing prevention, working set estimation and proactive reclaim
>    work out of the box; there are no equivalent solutions.
> 3. There is a lot of new code; nobody has demonstrated smaller changes
>    with similar effects.
> 
> Our options, accordingly, are:
> 1. Given the amount of evidence, the reported improvements will likely
>    materialize for a wide range of workloads.
> 2. Gauging the interest from the past discussions [14][15][16], the
>    new features will likely be put to use for both personal computers
>    and data centers.
> 3. Based on Google's track record, the new code will likely be well
>    maintained in the long term. It'd be more difficult if not
>    impossible to achieve similar effects on top of the existing
>    design.

Hi Andrew, Linus,

Can you please take a look at this patchset and let me know if it's
5.17 material?

My goal is to get it merged asap so that users can reap the benefits
and I can push the sequels. Please examine the data provided -- I
think the unprecedented coverage and the magnitude of the improvements
warrant a green light.

Thanks!

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