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 [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
- References:
- [patch 00/23] Slab defragmentation V6
- From: Christoph Lameter <[email protected]>
- [patch 07/23] SLUB: Add defrag_ratio field and sysfs support.
- From: Christoph Lameter <[email protected]>
- Re: [patch 07/23] SLUB: Add defrag_ratio field and sysfs support.
- From: [email protected] (Mel Gorman)
- [patch 00/23] Slab defragmentation V6
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