On Tuesday, 7 March 2017 16:42:31 CET René J.V. Bertin wrote: > On Tuesday March 7 2017 14:20:18 Simon Hausmann wrote: > Hi > > > But for example if KDevelop ends up using QtScript and you're on a 64-bit > > system, then we end up allocating 2GB of address space, which the kernel > > has to copy (in terms of page tables) when forking. It could be that > > you're short of that. > That could be, but if my understanding of overcommit_memory=2 is correct I > should still have enough margin for even that. Unless there's an additional > per-process limit that comes into play? > >We should probably mark these address spaces with MADV_DONTFORK. > > I suppose I could test such a change, if that helps. > > >But can you check first if KDevelop ends up using QtScript by chance? > > The CMake project manager appears to use QScript for evaluating math > expressions but even a session that doesn't load the corresponding plugin > ends up loading the QtScript library according to its /proc/.../maps file. > If Kevin picks up on this thread he may be able to say more about the paths > through which KDevelop ends up using QtScript.
Here it is:
% lddtree .../libKDevPlatformShell.so
(snip)
libKDevPlatformLanguage.so.10 => .../libKDevPlatformLanguage.so.10
libGrantlee_Templates.so.5 => .../libGrantlee_Templates.so.5
libQt5Script.so.5 => .../libQt5Script.so.5
It's pulled in by the Grantlee library. KF5::TextEditor depends on Qt5::Script
as well.
Regards,
Kevin
> %> fgrep -i 5script /proc/24536/maps
> 7fd00cc9e000-7fd00cef5000 r-xp 00000000 00:27 37325
> /opt/local/libexec/qt5/lib/libQt5Script.so.5.8.0 7fd00cef5000-7fd00d0f5000
> ---p 00257000 00:27 37325
> /opt/local/libexec/qt5/lib/libQt5Script.so.5.8.0 7fd00d0f5000-7fd00d107000
> r--p 00257000 00:27 37325
> /opt/local/libexec/qt5/lib/libQt5Script.so.5.8.0 7fd00d107000-7fd00d109000
> rw-p 00269000 00:27 37325
> /opt/local/libexec/qt5/lib/libQt5Script.so.5.8.0
>
> R.
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--
Kevin Funk | [email protected] | http://kfunk.org
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