Cached metadata will still be valid for 1 second - do these still have dentries pointing to them? On Thu, May 27, 2010 at 8:38 AM, Jeff Layton <jlayton@xxxxxxxxxx> wrote: > On Wed, 26 May 2010 19:19:11 -0400 > Scott Lovenberg <scott.lovenberg@xxxxxxxxx> wrote: > >> >> >> Any rough idea of performance or memory savings (even in something >> >> artificial like dbench run)? >> >> >> >> >> > It's more of a memory savings thing. When I mount with -o noserverino >> > and run fsstress on the mount, I'd regularly see the size of the >> > cifs_inode_cache hit 60M or more (on a client with 1G RAM). With this >> > patch in place, it rarely goes over 2M in size. >> > >> > Eventually, memory pressure will force the size to go down, but if we >> > know that they'll never be used again (which is the case with >> > noserverino), it's better to go ahead and just free them. >> > >> > >> I take it this overrides the behavior of the vfs_cache_pressure before >> the memory pressure makes reclaiming cache necessary? > > Not exactly. vfs_cache_pressure just governs the way in which the VM > subsystem will attempt to free memory when it needs it by changing the > preference for flushing inode and dentry caches. > > This patch just aims to delete inodes that we know will never be used > again as soon as their refcount drops to 0. > > -- > Jeff Layton <jlayton@xxxxxxxxxx> > -- Thanks, Steve -- 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
