On Wed, Jul 02, 2014 at 03:38:50PM +0200, Stephane Eranian wrote: > On Wed, Jul 2, 2014 at 3:31 PM, Peter Zijlstra <pet...@infradead.org> wrote: > > Right, that'd suck. I suppose we could also change that to allocate the > > DS resources on first demand and never free them again. > > > Some may argue that if you never use perf_event again, you are wasting > (1 + 1 + 4) pages per CPU. That may not be okay on some systems. > > But yes, it would avoid this problem and also take the penalty for the allocs > only once.
We could of course over engineer this and put a timer on them to free after 5 minutes to avoid the alloc/free cycle for workloads that create/destroy events a lot.
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