netdev - Re: [PATCH 0/2] mark some slabs as visible not mergeable

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Date:   Sat, 24 Feb 2018 13:05:07 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, linux-mm@...ck.org,
        ikomyagin@...il.com, Stephen Hemminger <sthemmin@...rosoft.com>,
        Christoph Lameter <cl@...ux.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 0/2] mark some slabs as visible not mergeable

On Sat, Feb 24, 2018 at 11:04:52AM -0800, Stephen Hemminger wrote:
> This fixes an old bug in iproute2's ss command because it was
> reading slabinfo to get statistics. There isn't a better API
> to do this, and one can argue that /proc is a UAPI that must
> not change.
> 
> Therefore this patch set adds a flag to slab to give another
> reason to prevent merging, and then uses it in network code.

This is exactly the solution I would have suggested.  Note that SLUB
has always had slab merging, so this tool has been broken since 2.6.22
on any kernel with CONFIG_SLUB.

Reviewed-by: Matthew Wilcox <mawilcox@...rosoft.com>