#9706: New block-structured heap organization for 64-bit -------------------------------------+------------------------------------- Reporter: ezyang | Owner: simonmar Type: task | Status: new Priority: normal | Milestone: Component: Runtime | Version: 7.8.3 System | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by simonmar): Ok, so there's no problem with page tables for the reserved region on Linux. Using total memory + swap is a safe limit for the address space to reserve, since we never want to overcommit with actual heap memory. I still think we should separate this from the question of reorganising the block descriptors, which is probably a good idea and depends on this, but can be tackled separately. Open questions: * Does VirtualAlloc on Windows behave the same way? That is, can we allocate as much address space as we want, without creating page tables and without getting an out of memory error? * What do we do when overcommit is disabled on Linux? * What about OS X? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9706#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler