[Webkit-unassigned] [Bug 42756] JIT requires VM overcommit (particularly on x86-64), Linux does not by default support this without swap?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42756


Gavin Barraclough <barraclough at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |




--- Comment #42 from Gavin Barraclough <barraclough at apple.com>  2011-01-31 11:29:52 PST ---
Reopening due to bug #53352.

The upshot of this bug is, the fix landed here wouldn't work anyway (without overcommit you'll allocate the smaller sized buffer, then crash after a short period of browsing once the JIT buffer became nicely fragmented).

Please see comment in bug #53352, options are to not support this configuration, always use the reduced size (and break some stress tests), or reimplement a dynamic/static switch based on whether overcommit is available.

If we need a switching solution, one option might be to always use 1GB tables, to just change the amount we allocate, and then to add a method to the AllocateTableDirectory to mark ranges of the table as unavailable.

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