[Webkit-unassigned] [Bug 118733] Javascript JIT still allocates 2GB of memory on x86-64 Linux

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=118733





--- Comment #6 from Gavin Barraclough <barraclough at apple.com>  2013-07-16 10:05:26 PST ---
(In reply to comment #5)
> In general its better to not overcommit, unless you have to. In this case I think the 2GB reservation can be worked around by using MAP_32BIT, so it is not an absolute requirement to overcommit by that much.

Agreed – but note that the memory is being allocated by a method called 'reserveUncommitted' – an implementation of this method should be allocating VM without committing, so there should be no overcommit.  Unfortuantely it appears that this is a little trickier to achieve on Linux than other platforms (Windows appears to win at best VM API for this particular use case) – but it seems to have been possible to coax Linux into doing so in the past, and the real fix here should be to get this going again.

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