#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 thoughtpolice):
I'm worried about the overhead of having to pre-allocate a large number of page tables for the reserved address space
Like Reid mentioned, this shouldn't be too much of an issue on Linux, at least, until we get the initial page fault to map things in the first place. But beyond that, we can possibly mitigate some TLB/mapping thrashes a bit on Linux at least using hugetables, which should beef up the page sizes from 4k to 1MB or so. On older Linux systems though this is a bit of a basket case, since you need `hugetblfs`, which is super annoying and before transparent hugepages/mmap flags were introduced in glibc. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9706#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler