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An unexpected perf feature
LWN.net Weekly Edition for May 16, 2013
A look at the PyPy 2.0 release
PostgreSQL 9.3 beta: Federated databases and more
LWN.net Weekly Edition for May 9, 2013
Yes, you are overly naive...
Posted Jul 22, 2009 18:53 UTC (Wed) by PaXTeam (subscriber, #24616)
however there's more cost to this: TLB repopulation which would inevitably occur after returning to userland. that is the real expense as we're talking about up to hundreds of TLB entries on modern CPU cores, each potentially missing in the data cache and incurring hundreds of cycles.
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