linux-kernel - Re: [PATCH 0/3] try to save some memory for kmem

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Message-ID: <alpine.DEB.2.20.1704301621170.21370@east.gentwo.org>
Date:   Sun, 30 Apr 2017 16:22:47 -0500 (CDT)
From:   Christoph Lameter <cl@...ux.com>
To:     Wei Yang <richard.weiyang@...il.com>
cc:     penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] try to save some memory for kmem_cache in some
 cases

On Sun, 30 Apr 2017, Wei Yang wrote:

> kmem_cache is a frequently used data in kernel. During the code reading, I
> found maybe we could save some space in some cases.
>
> 1. On 64bit arch, type int will occupy a word if it doesn't sit well.
> 2. cpu_slab->partial is just used when CONFIG_SLUB_CPU_PARTIAL is set
> 3. cpu_partial is just used when CONFIG_SLUB_CPU_PARTIAL is set, while just
> save some space on 32bit arch.

This looks fine. But do we really want to add that amount of ifdeffery?
How much memory does this save?