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

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Date:   Thu, 18 May 2017 11:06:37 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Wei Yang <richard.weiyang@...il.com>
Cc:     cl@...ux.com, 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 17-05-17 22:11:40, 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.
> 
> 1. Refine slab sysfs
> 
> There are four level 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
> 
> And when we look at current implementation, some of them are missing. So patch
> 2 & 3 add them up.
> 
> 2. Rename sysfs
> 
> The slab statistics in sysfs are
> 
>     slabs
>     objects
>     total_objects
>     cpu_slabs
>     partial
>     partial_objects
>     cpu_partial_slabs
> 
> 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

_Why_ do we need all this?
-- 
Michal Hocko
SUSE Labs