linux-kernel - Re: SLUB: purpose of sysfs events on cache creation/removal

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Date:   Tue, 26 Nov 2019 16:32:56 +0000 (UTC)
From:   Christopher Lameter <cl@...ux.com>
To:     Michal Hocko <mhocko@...nel.org>
cc:     LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: SLUB: purpose of sysfs events on cache creation/removal

On Tue, 26 Nov 2019, Michal Hocko wrote:

> Hi,
> I have just learnt about KOBJ_{ADD,REMOVE} sysfs events triggered on
> kmem cache creation/removal when SLUB is configured. This functionality
> goes all the way down to initial SLUB merge. I do not see any references
> in the Documentation explaining what those events are used for and
> whether there are any real users.
>
> Could you shed some more light into this?

I have no idea about what this is. There have been many people who
reworked the sysfs support and this has been the cause for a lot of
breakage over the years.