Messages in this thread | | | Date | Tue, 29 Jul 2014 10:26:08 -0500 (CDT) | From | Christoph Lameter <> | Subject | Re: vmstat: On demand vmstat workers V8 |
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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?
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