On Tue, 29 Jul 2014, Tejun Heo wrote: > > mm/vmstat.c already has cpu down hooks. See vmstat_cpuup_callback(). > > Hmmm, well, then it's something else. Either a bug in workqueue or in > the caller. Given the track record, the latter is more likely. > e.g. it looks kinda suspicious that the work func is cleared after > cancel_delayed_work_sync() is called. What happens if somebody tries Ok we can clear it before then. Just looked at the current upstream code. It also does a __this_cpu_read() in refresh_cpu_stats() without triggering the preemption check. What changed in -next that made the test trigger now? -- 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>