linux-kernel - Re: [PATCH 2/2] zsmalloc: fine-grained inuse ratio based fullness grouping

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Message-ID: <Y+XIR64RyVv0EfTx@google.com>
Date:   Fri, 10 Feb 2023 13:29:59 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Yosry Ahmed <yosryahmed@...gle.com>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 2/2] zsmalloc: fine-grained inuse ratio based fullness
 grouping

On (23/02/09 20:25), Yosry Ahmed wrote:
> > On (23/02/07 10:47), Sergey Senozhatsky wrote:
[..]
> > Forgot to mention, I was also thinking about extending zsmalloc stats
> > file and providing values for each fullness group per class, as opposed
> > to current ALMOST_EMPTY and ALMOST_FULL stats, which don't tell much.
> 
> Makes sense.
> 
> >
> > I can get rid of static const arrays and pass "begin / end" group IDs to
> > functions that iterate fullness lists and pick the first head page, but
> > I think that enum values will stay.
> 
> Do they have to stay for a technical reason or just to make reviews simpler?

We need to be able to do zs_stat_get(class, CLASS_USAGE_70) or
zs_stat_get(class, CLASS_USAGE_10) in zs_stats_size_show() to
show class's fullness stats.