On Monday, 20 November 2006 12:10, Miklos Szeredi wrote: > The shrink_dcache_parent() can take a very long time for deep > directory trees: minutes for depth of 100,000, probably hours for > depth of 1,000,000. > > The reason is that after dropping a leaf, it starts again from the > root. Oh, well. So that's the reason why the shrinking of memory in swsusp can take so much time. > Filesystems affected include FUSE, NFS, CIFS. Others I haven't > checked. NFS and to a lesser extent CIFS don't seem to efficiently > handle lookups within such a deep hierarchy, so they're sort of > immune. > > But with FUSE it's pretty easy to DoS the system. > > Limiting the depth to some sane value could work around this problem, > but that would mean having to traverse subtrees in rename(). > > Any better ideas? None, for now. It looks like I need to learn that code ... Greetings, Rafael -- You never change things by fighting the existing reality. R. Buckminster Fuller - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
