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 zone_reclaimable() continues using outdated vm_stat[] values and the 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
