> > It mean congestion ignorerance is happend when followings > > (1) the task is kswapd > > (2) the task is flusher thread > > (3) this reclaim is called from zone reclaim (note: I'm thinking this is bug) > > (4) this reclaim is called from __generic_file_aio_write() > > > > (4) is root cause of this latency issue. this behavior was introduced > > by following. > > Yes and no. > > (1)-(4) are good summaries for regular files. However !bdi_write_congested(bdi) > is now unconditionally true for the swapper_space, which means any process can > do swap out to a congested queue and block there. Oops. I missed that. thanks correct me! -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>