linux-kernel - Re: [PATCH v3 3/5] zsmalloc: Add a LRU to zs_pool to keep track of zspages in LRU order

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Date:   Wed, 16 Nov 2022 17:02:57 -0500
From:   Johannes Weiner <hannes@...xchg.org>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Nhat Pham <nphamcs@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, ngupta@...are.org,
        senozhatsky@...omium.org, akpm@...ux-foundation.org,
        sjenning@...hat.com, ddstreet@...e.org, vitaly.wool@...sulko.com
Subject: Re: [PATCH v3 3/5] zsmalloc: Add a LRU to zs_pool to keep track of
 zspages in LRU order

On Thu, Nov 10, 2022 at 02:48:32PM -0800, Minchan Kim wrote:
> On Thu, Nov 10, 2022 at 09:18:31AM -0800, Nhat Pham wrote:
> > > Please put the LRU logic under config ZSMALLOC_LRU since we don't need the
> > > additional logic to others.
> > 
> > I think the existing CONFIG_ZPOOL would be a good option for this purpose. It
> > should disable the LRU behavior for non-zswap use case (zram for e.g). The
> > eviction logic is also currently defined under this. What do you think,
> > Minchan?
> 
> That sounds good.
> 
> Sergey and I are working to change zsmalloc zspage size.
> https://lore.kernel.org/linux-mm/20221031054108.541190-1-senozhatsky@chromium.org/
> 
> Could you send a new version once we settle those change down
> in Andrew's tree to minimize conflict?
> (Feel free to join the review/discussion if you are also interested ;-))

I've been reading through that thread, and it doesn't look like it'll
be ready for the upcoming merge window. (I've tried to contribute
something useful to it, but it's a fairly difficult tuning problem,
and I don't know if a sysfs knob is the best answer, either...)

Would you have any objections to putting Nhat's patches here into 6.2?

It doesn't sound like there was any more feedback (except the trivial
ifdef around the LRU), and the patches are otherwise ready to go.