linux-kernel - Re: [PATCH] kernfs: support kernfs notify in memory recliam context

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Date:   Fri, 17 Nov 2023 09:36:40 +0100
From:   Mariusz Tkaczyk <mariusz.tkaczyk@...ux.intel.com>
To:     junxiao.bi@...cle.com
Cc:     Song Liu <song@...nel.org>, Tejun Heo <tj@...nel.org>,
        linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH] kernfs: support kernfs notify in memory recliam context

On Thu, 16 Nov 2023 09:04:34 -0800
junxiao.bi@...cle.com wrote:

> On 11/15/23 7:30 AM, Mariusz Tkaczyk wrote:
> 
> > On Tue, 14 Nov 2023 15:53:47 -0800
> > junxiao.bi@...cle.com wrote:
> >  
> >> Understood, thanks. Sound like depending on Userspace on memory reclaim
> >> path is really bad idea and the only option for fixing it is to remove
> >> that dependency, but i am not sure that is possible without breaking the
> >> consistency of metadata.
> >>
> >> Thanks,
> >>
> >> Junxiao.  
> > Indeed the project of external metadata management if fragile. You cares
> > about IMSM here (same as me) so ideally we should implement metadata
> > management in kernel- I think that IMSM deserved that after 10 years on the
> > market. There is no better option, other options are just "workarounds" for
> > the lack of metadata management in kernel.  
> Agree, sound like that's the way to proceed.
> >
> > Song, any comments here?
> >
> >  From the second hand, there is native raid which should just work, so
> > maybe you can switch to the native raid?  
> 
> Unfortunately that's is not possible, it's a production setup to use 
> imsm raid.

Implementing IMSM in kernel is a goal for months/ years so I don't
see it in a timeline you would need that on to fix your production setup. It
will be a big feature, but let's wait for Song voice first.

Thanks,
Mariusz