Re: [patch 07/23] SLUB: Add defrag_ratio field and sysfs support.

[Christoph Lameter]

On Thu, 8 Nov 2007, Mel Gorman wrote:

> On (06/11/07 17:11), Christoph Lameter didst pronounce:
> > The defrag_ratio is used to set the threshold at which defragmentation
> > should be run on a slabcache.
> > 
> 
> I'm thick, I would like to see a quick note here on what defragmentation
> means. Also, this defrag_ratio seems to have a significantly different
> meaning to the other defrag_ratio which isn't helping my poor head at
> all.

Yes that is why they have different names. The remote_node_defrag ratio 
controls the amount of remote allocs we do to reduce fragmentation.
 
> "The defrag_ratio sets a threshold at which a slab will be vacated of all
> it's objects and the pages freed during memory reclaim."

Sortof. If a slab is beyond the threshold during reclaim then reclaim will 
attempt to free the remaining objects in the slab to reclaim the whole 
slab.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/