Messages in this thread | | | Subject | Re: [patch 3/3] vmstat: Create our own workqueue | From | Tetsuo Handa <> | Date | Tue, 3 Nov 2015 01:52:13 +0900 |
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Christoph Lameter wrote: > On Sat, 31 Oct 2015, Tetsuo Handa wrote: > > > Then, you need to update below description (or drop it) because > > patch 3/3 alone will not guarantee that the counters are up to date. > > The vmstat system does not guarantee that the counters are up to date > always. The whole point is the deferral of updates for performance > reasons. They are updated *at some point* within stat_interval. That needs > to happen and that is what this patchset is fixing. > I'm still unclear. I think that the result of this patchset is
The counters are never updated even after stat_interval if some workqueue item is doing a __GFP_WAIT memory allocation.
but the patch description sounds as if
The counters will be updated even if some workqueue item is doing a __GFP_WAIT memory allocation.
which denies the actual result I tested with this patchset applied.
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