On Mon, Nov 16, 2015 at 6:05 AM, Jan Kara <jack@xxxxxxx> wrote: > On Mon 16-11-15 14:37:14, Jan Kara wrote: [..] > But a question: Won't it be better to do sfence + pcommit only in response > to REQ_FLUSH request and don't do it after each write? I'm not sure how > expensive these instructions are but in theory it could be a performance > win, couldn't it? For filesystems this is enough wrt persistency > guarantees... We would need to gather the performance data... The expectation is that the cache flushing is more expensive than the sfence + pcommit. -- 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>