linux-kernel - Re: [PATCH v3] mm: zswap: multiple zpools support

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Message-ID: <CAF8kJuMj1ioKwt9b+JvLNHEpOLEjo+=RyY9z8yELhhNN1udrtg@mail.gmail.com>
Date:   Tue, 15 Aug 2023 15:59:48 -0700
From:   Chris Li <chriscli@...gle.com>
To:     Yosry Ahmed <yosryahmed@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Nhat Pham <nphamcs@...il.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Vitaly Wool <vitaly.wool@...sulko.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Domenico Cerasuolo <cerasuolodomenico@...il.com>,
        Yu Zhao <yuzhao@...gle.com>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] mm: zswap: multiple zpools support

Hi Yosry,

Sure.

Ack-by: Chris Li (Google) <chrisl@...nel.org>

Chris

On Tue, Aug 15, 2023 at 3:30 PM Yosry Ahmed <yosryahmed@...gle.com> wrote:
>
> I was hoping we can add the basic support here for multiple zpools,
> and then later, if needed, extend to support runtime dynamic tuning.
> Adding this will introduce more complexity as we will need to lock all
> trees and make sure there is no activity and alloc/free zpools. If a
> limitation for compile-time constant is observed we can do that,
> otherwise let's keep it simple and incremental for now.
>
> FWIW, we have been running with 32 zpools in Google's fleet for ~a
> decade now and it seems to work well for various workloads and machine
> configurations.
>
> >
> > Chris
> >
> > > has seen a ton of testing. I was hoping Johannes would get time to
> > > take a look, or Nhat would get time to test it out, but neither of
> > > these things happen.
> > >
> > > I obviously want it to be merged, but hopefully someone will chime in here :)
> > >
>