Messages in this thread | | | Date | Mon, 22 Jun 2015 20:52:29 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC][PATCH] fs: optimize inotify/fsnotify code for unwatched files |
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On Mon, Jun 22, 2015 at 08:11:21AM -0700, Paul E. McKenney wrote: > That depends on how slow the resulting slow global state would be. > We have some use cases (definitely KVM, perhaps also some of the VFS > code) that need the current speed, as opposed to the profound slowness > that three trips through synchronize_sched() would provide.
So what we have with that percpu-rwsem code that I send out earlier today is a conditional smp_mb(), and I think we can do the same for SRCU.
I'm just not sure !GP is common enough for all SRCU cases to be worth doing.
Those that rely on sync_srcu() and who do it rarely would definitely benefit. The same with those that rarely do call_srcu().
But those that heavily use call_srcu() would be better off with the prolonged GP with 3 sync_sched() calls in. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in Please read the FAQ at http://www.tux.org/lkml/
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