On Tue, Aug 23, 2011 at 07:20:41PM +1000, Dave Chinner wrote: > > Why do we keep the SLAB_HWCACHE_ALIGN flag for some filesystems? > > I didn't touch that one, mainly because I think that there are > different reasons for wanting cacheline alignment. e.g. a filesystem > aimed primarily at embedded systms with slow CPUs and little memory > doesn't want to waste memory on cacheline alignment.... A little grepping shows jffs2 is a counter example, because it exactly wants SLAB_HWCACHE_ALIGN to avoid issues with mtd dma. I'm fine with defering this for now, but the state of using SLAB_HWCACHE_ALIGN or not is just as much as mess as the rest of the inode slab flags was. I'd go as far as calling the whole existance of most slab flags an utter mess, but that is another fight. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>