On Tue, Nov 26, 2013 at 11:20:53AM +0100, Peter Zijlstra wrote: > On Tue, Nov 26, 2013 at 10:17:16AM +1100, Dave Chinner wrote: > > void truncate_inode_pages_final(struct address_space *mapping) > > { > > mapping_set_exiting(mapping); > > if (inode->i_data.nrpages || inode->i_data.nrshadows) { > > /* > > * spinlock barrier to ensure all modifications are > > * complete before we do the final truncate > > */ > > spin_lock_irq(&mapping->tree_lock); > > spin_unlock_irq(&mapping->tree_lock); > > spin_unlock_wait() ? > > Its cheaper, but prone to starvation; its typically useful when you're > waiting for the last owner to go away and know there won't be any new > ones around. The other side is reclaim plucking pages one-by-one from the address space in LRU order. It'd be preferable to not starve the truncation side, because it is much more efficient at getting rid of those pages. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>