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This review has been submitted with commit d8949d77b5bc33d540dc7f791cee3691ee9dbb85 by Philipp Knechtges to branch master. - Commit On June 26, 2011, 1:27 p.m., Philipp Knechtges wrote: > > ----------------------------------------------------------- > This is an automatically generated e-mail. To reply, visit: > http://git.reviewboard.kde.org/r/101385/ > ----------------------------------------------------------- > > (Updated June 26, 2011, 1:27 p.m.) > > > Review request for kwin and Plasma. > > > Summary > ------- > > The intention of this patch is to lower the heap fragmentation in KWin when > using the raster backend. > > One can illustrate the issue with the following testcase: If one currently > uses the raster backend and > switches back to non-compositing mode one gets easily a similar memory usage > like the following: > > Situation: 14 windows, QtCurve > KWin started with compositing: 40 MB > KWin switched to non-compositing : more than 70 MB > > The first guess might be, that this is due to a memleak because of not > properly released pixmaps. > But calling malloc_stats() sheds some more light on the subject > (non-compositing mode): > > Arena 0: > system bytes = 72232960 > in use bytes = 8180512 > Arena 1: > system bytes = 135168 > in use bytes = 4784 > Total (incl. mmap): > system bytes = 73080832 > in use bytes = 8898000 > max mmap regions = 13 > max mmap bytes = 36343808 > > In other words, the glibc has allocated more than 70 MB memory although KWin > uses only less than 10 MB. > The problem is that glibc only resizes the heap if the heap has more than 128 > KB of free space at the end, but > many decoration pixmaps are smaller. Using mallopt to tune the threshold to > 20 KB (i'm open for other suggestions?) > fixes the issue. After the patch: > > KWin in compositing mode: 19 MB > KWin switched to non-compositing: 13 MB > > > Arena 0: > system bytes = 12374016 > in use bytes = 6894544 > Arena 1: > system bytes = 135168 > in use bytes = 4784 > Total (incl. mmap): > system bytes = 13750272 > in use bytes = 8140416 > max mmap regions = 67 > max mmap bytes = 99463168 > > Are there some negative effects? > The only negative effect i am aware of is, that Glibc free() is calling the > sbrk syscall more often. But this should > not be a bottleneck. > > > Diffs > ----- > > ConfigureChecks.cmake e8b64a2 > config-workspace.h.cmake fabe7fa > kwin/main.cpp f767f54 > libs/kworkspace/kworkspace.h f24ea42 > libs/kworkspace/kworkspace.cpp 5e9afb9 > > Diff: http://git.reviewboard.kde.org/r/101385/diff > > > Testing > ------- > > Tested using a standard Fedora 14. > Would be nice to know, whether other OSes have similar issues? > Martin Gräßlin had some concerns about the portability? > > > Thanks, > > Philipp > >
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