linux-kernel - Re: [PATCHv4 2/9] zram: Add recompression algorithm sysfs knob

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Date:   Thu, 3 Nov 2022 10:10:42 -0700
From:   Minchan Kim <minchan@...nel.org>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Nitin Gupta <ngupta@...are.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCHv4 2/9] zram: Add recompression algorithm sysfs knob

On Thu, Nov 03, 2022 at 12:54:43PM +0900, Sergey Senozhatsky wrote:
> On (22/11/03 12:05), Sergey Senozhatsky wrote:
> > [..]
> > > Just open question(I might be too paranoid?)
> > > 
> > > I am thinking someone want to add third comp algorithm in future
> > > to balance decompression and memory efficiency.
> > > 
> > > If it's not too crazy idea, let's think about the interface.
> > > Maybe, could we make the recomp knobs works like list?
> > > 
> > > # A primary comp
> > > echo "A" > /zram/comp_algo
> > > 
> > > # Multiple secondary comps
> > > echo "B threshold" > /zram/add_recomp_algo
> > > echo "C threshold" > /zram/add_recomp_algo
> > > echo "D threshold" > /zram/add_recomp_algo
> 
> As a side note:
> The way it's implemented currently is that comps is an array, so we
> can store more comps there. I sort of was thinking that we probably
> can have more than two algos at some point the in the future (hence
> the MULTI_COMPRESS config option).

Sure.