On Fri, 3 Nov 2017, Chris Metcalf wrote: > However, it doesn't seem possible to do the synchronous cancellation of > the vmstat deferred work with irqs disabled, though if there's a way, > it would be a little cleaner to do that; Christoph? We can certainly > update the statistics with interrupts disabled via > refresh_cpu_vm_stats(false), but that's not sufficient. For now, I Callig quiet_vmstat() gives you the folding of the statistics without the numa page allocator page cleanup. Leaving some pages in the queues should not be that much of an issue. > What about that d*mn 1 Hz clock? > > It's still there, so this code still requires some further work before > it can actually get a process into long-term task isolation (without > the obvious one-line kernel hack). Frederic suggested a while ago > forcing updates on cpustats was required as the last gating factor; do > we think that is still true? Christoph was working on this at one > point - any progress from your point of view? Well if you still have the 1 HZ clock then you can simply defer the numa remote page cleanup of the page allocator to that the time you execute that tick. -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
