linux-kernel - Re: [patch 12/26] SLUB: Slab defragmentation core

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Message-ID: <29495f1d0706261213w73b7cbe0weabdcb2b03a9b880@mail.gmail.com>
Date:	Tue, 26 Jun 2007 12:13:57 -0700
From:	"Nish Aravamudan" <nish.aravamudan@...il.com>
To:	"clameter@....com" <clameter@....com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, "Pekka Enberg" <penberg@...helsinki.fi>,
	suresh.b.siddha@...el.com
Subject: Re: [patch 12/26] SLUB: Slab defragmentation core

On 6/18/07, clameter@....com <clameter@....com> wrote:
> Slab defragmentation occurs either
>
> 1. Unconditionally when kmem_cache_shrink is called on slab by the kernel
>    calling kmem_cache_shrink or slabinfo triggering slab shrinking. This
>    form performs defragmentation on all nodes of a NUMA system.
>
> 2. Conditionally when kmem_cache_defrag(<percentage>, <node>) is called.
>
>    The defragmentation is only performed if the fragmentation of the slab
>    is higher then the specified percentage. Fragmentation ratios are measured
>    by calculating the percentage of objects in use compared to the total
>    number of objects that the slab cache could hold.
>
>    kmem_cache_defrag takes a node parameter. This can either be -1 if
>    defragmentation should be performed on all nodes, or a node number.
>    If a node number was specified then defragmentation is only performed
>    on a specific node.

Hrm, isn't -1 usually 'this node' for NUMA systems? Maybe nr_node_ids
or MAX_NUMNODES should mean 'all nodes'?

Perhaps these would be served with some #defines?

#define NUMA_THISNODE_ID (-1)
#define NUMA_ALLNODES_ID (MAX_NUMNODES)

or something?

Thanks,
Nish
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