netdev - Re: [PATCH 2/2] slab, slub, slob: convert slab_flags

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Date:   Sun, 22 Oct 2017 09:40:27 +0300
From:   Pekka Enberg <penberg@....fi>
To:     Alexey Dobriyan <adobriyan@...il.com>, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, cl@...ux.com, penberg@...nel.org,
        rientjes@...gle.com, iamjoonsoo.kim@....com,
        ecryptfs@...r.kernel.org, linux-xfs@...r.kernel.org,
        kasan-dev@...glegroups.com, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] slab, slub, slob: convert slab_flags_t to 32-bit



On 21/10/2017 13.06, Alexey Dobriyan wrote:
> struct kmem_cache::flags is "unsigned long" which is unnecessary on
> 64-bit as no flags are defined in the higher bits.
> 
> Switch the field to 32-bit and save some space on x86_64 until such
> flags appear:
> 
> 	add/remove: 0/0 grow/shrink: 0/107 up/down: 0/-657 (-657)
> 	function                                     old     new   delta
> 	sysfs_slab_add                               720     719      -1
> 				...
> 	check_object                                 699     676     -23
> 
> Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>

Acked-by: Pekka Enberg <penberg@...nel.org>