On Mon, 9 July 2007 09:29:38 +1000, David Chinner wrote: > On Sat, Jul 07, 2007 at 12:45:35PM +0200, Jörn Engel wrote: > > > > Oh certainly! I should dust off my dcache_static patch. Some dentries > > are hands-off for the shrinker, basically mountpoints and tmpfs. The > > patch moves those to a seperate slab cache. > > I doubt there's enough of those to make any difference - putting all > the directories into another slab did little to reduce fragmentation > (~18 months ago we tried that), so I don't think that this would help > at all...
Interesting. I suspect that the de-facto random cache eviction has a bigger effect and overshadows everything else. So the decisive step would be to nuke all dentries in a given slab. It wouldn't surprise me if your patch did make a difference afterwards. With 32 dentries per slab, it doesn't take many pinned objects to pin most slabs. Jörn -- All art is but imitation of nature. -- Lucius Annaeus Seneca - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
