[Webkit-unassigned] [Bug 65766] JIT still requires VM overcommit

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Aug 5 12:32:17 PDT 2011


Gavin Barraclough <barraclough at apple.com> changed:

           What    |Removed                     |Added
                 CC|                            |barraclough at apple.com

--- Comment #1 from Gavin Barraclough <barraclough at apple.com>  2011-08-05 12:32:17 PST ---
I'm going to retitle this bug since "JIT still requires VM overcommit" is not a bug, this is by design. :o)

We need a mechanism to map VM space without reserving physical memory.  It sounds like MAP_NORESERVE should do exactly this, so my first question would be, why is this not working?  If the kernel is not obeying the MAP_NORESERVE flag, it seems there are two options:

(1) Make the kernel obey MAP_NORESERVE.
(2) Find an alternate interface that will allocate VM without reserving physical memory.

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