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

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Message-ID: <20170523032705.GA4275@WeideMBP.lan>
Date:   Tue, 23 May 2017 11:27:05 +0800
From:   Wei Yang <richard.weiyang@...il.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Wei Yang <richard.weiyang@...il.com>, 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 Thu, May 18, 2017 at 11:06:37AM +0200, Michal Hocko wrote:
>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?

To have a clear statistics for each slab level.

>-- 
>Michal Hocko
>SUSE Labs

-- 
Wei Yang
Help you, Help me

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