Messages in this thread | | | Date | Wed, 27 Dec 2000 20:43:42 +0100 | From | Andrea Arcangeli <> | Subject | Re: high load & poor interactivity on fast thread creation |
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On Wed, Dec 27, 2000 at 09:32:36AM -0800, Larry McVoy wrote: > [..] You do > pay a price for not sharing TLB entries if the OS is stupid (Linux' is > not).
Even assuming all segments are attached at the same virtual address on all MM (this can be enforced with MAP_FIXED of course), we can't use the same tlb entries for accessing the same shared sement from different MM. That's not even possible on hardware with address space numbers (on x86 it's obvious it's not possible even with future x86 chips that can tag the TLB entries with the phisical address of the pgd to skip the full tlb flush during switch_mm).
I think the main point of using threads instead of shared mappings is performance.
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