Simon Jeons <simon.jeons@xxxxxxxxx> wrote: > On Tue, 2012-12-25 at 02:22 +0000, Eric Wong wrote: > > Please add changelog. Changes since v1: * separate unbound workqueue for high-priority tasks * account for inflight readahead to avoid denial-of-service * limit concurrency for non-high-priority tasks (1 per CPU, same as aio) * take IO priority of requesting process into account when in workqueue. * process queued readahead in 2M chunks to help ensure fairness between multiple requests with few CPUs/workqueues. Idle tasks get smaller 256K chunks. * stops readahead for idle tasks on read congestion Will try to benchmark with Postgres when I get the chance. Any other (Free Software) applications that might benefit from lower FADV_WILLNEED latency? -- 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>