On Wed, 21 Oct 2015, Tetsuo Handa wrote: > However, if a workqueue which is processed before vmstat_update > workqueue is processed got stuck inside memory allocation request, > values in vm_stat_diff[] cannot be merged into vm_stat[]. As a result, > zone_reclaimable() continues using outdated vm_stat[] values and the > task which is doing direct reclaim path thinks that there are reclaimable > pages and therefore continues looping. The consequence is a silent > livelock (hang up without any kernel messages) because the OOM killer > will not be invoked. The diffs will be merged if they reach a certain threshold regardless. You can decrease that threshhold. See calculate_pressure_threshhold(). Why is the merging not occurring if a process gets stuck? Workrequests are not blocked by a process being stuck doing memory allocation or reclaim. -- 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>