linux-kernel - Re: [External] Re: [RFC PATCH 1/3] zram: charge the compressed RAM to the page's memcgroup

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Message-ID: <ZIseQdSx9GAiyYDm@dhcp22.suse.cz>
Date:   Thu, 15 Jun 2023 16:20:49 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     贺中坤 <hezhongkun.hzk@...edance.com>
Cc:     minchan@...nel.org, senozhatsky@...omium.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [External] Re: [RFC PATCH 1/3] zram: charge the compressed RAM
 to the page's memcgroup

On Thu 15-06-23 22:13:09, 贺中坤 wrote:
> > This is not really answering my question though. memcg under hard limit
> > is not really my concern. This is a simpler case. I am not saying it
> > doesn't need to get addresses but it is the memcg hard limited case that
> > is much more interested. Because your charges are going to fail very
> > likely and that would mean that swapout would fail AFAIU. If my
> > understanding is wrong then it would really help to describe that case
> > much more in the changelog.
> >
> 
> OK, Got it. In many cases I have tested, it  will not fail because we did
> not charge the page directly，but the objects(like  slab,compressed page),
> for the zspage may be shared by any memcg.

That sounds like a broken design to me.
-- 
Michal Hocko
SUSE Labs