On Wed, 09 Jan 2013 22:41:48 +0100 Zlatko Calusic <zlatko.calusic@xxxxxxxx> wrote: > Currently we take a short nap (HZ/10) and wait for congestion to clear > before taking another pass with lower priority in balance_pgdat(). But > we do that only for the highest zone that we encounter is unbalanced > and congested. > > This patch changes that to wait on all congested zones in a single > pass in the hope that it will save us some scanning that way. Also we > take a nap as soon as congested zone is encountered and sc.priority < > DEF_PRIORITY - 2 (aka kswapd in trouble). > > ... > > The patch is against the mm tree. Make sure that > mm-avoid-calling-pgdat_balanced-needlessly.patch is applied first (not > yet in the mmotm tree). Tested on half a dozen systems with different > workloads for the last few days, working really well! But what are the user-observable effcets of this change? Less kernel CPU consumption, presumably? Did you quantify it? -- 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>