linux-kernel - Re: [PATCH 0/6] refine and rename slub sysfs

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Date:   Wed, 17 May 2017 09:57:28 -0500 (CDT)
From:   Christoph Lameter <cl@...ux.com>
To:     Wei Yang <richard.weiyang@...il.com>
cc:     penberg@...nel.org, rientjes@...gle.com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] refine and rename slub sysfs

On Wed, 17 May 2017, Wei Yang wrote:

> This patch serial could be divided into two parts.
>
> First three patches refine and adds slab sysfs.
> Second three patches rename slab sysfs.

These changes will break the slabinfo tool in linux/tools/vm/slabinfo.c.
Please update it as well.

> 1. Refine slab sysfs
>
> There are four level slabs:

levels? Maybe types of slabs?

>     CPU
>     CPU_PARTIAL
>     PARTIAL
>     FULL
>
> And in sysfs, it use show_slab_objects() and cpu_partial_slabs_show() to
> reflect the statistics.
>
> In patch 2, it splits some function in show_slab_objects() which makes sure
> only cpu_partial_slabs_show() covers statistics for CPU_PARTIAL slabs.
>
> After doing so, it would be more clear that show_slab_objects() has totally 9
> statistic combinations for three level of slabs. Each slab has three cases
> statistic.
>
>     slabs
>     objects
>     total_objects

That sounds good.

> which is a little bit hard for users to understand. The second three patches
> rename sysfs file in this pattern.
>
>     xxx_slabs[[_total]_objects]
>
> Finally it looks Like
>
>     slabs
>     slabs_objects
>     slabs_total_objects
>     cpu_slabs
>     cpu_slabs_objects
>     cpu_slabs_total_objects
>     partial_slabs
>     partial_slabs_objects
>     partial_slabs_total_objects
>     cpu_partial_slabs

Arent we missing:

cpu_partial_slabs_objects
cpu_partial_slabs_total_objects

And the partial slabs exclude the cpu slabs as well as the cpu_partial
slabs?

Could you add some documentation as well to explain the exact semantics?