Bug 242457 - KWin blur effect has memory leak
Summary: KWin blur effect has memory leak
Status: RESOLVED WORKSFORME
Alias: None
Product: kwin
Classification: Plasma
Component: compositing (show other bugs)
Version: unspecified
Platform: Compiled Sources Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-06-22 10:11 UTC by Andreas Kuhl
Modified: 2010-12-10 20:19 UTC (History)
3 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
sysprof profile with blur (113.42 KB, application/octet-stream)
2010-07-18 10:06 UTC, Max 		Details
sysprof profile without the blur effect enabled (103.40 KB, application/octet-stream)
2010-07-18 10:06 UTC, Max 		Details
Show Obsolete (2) View All Add an attachment

Note You need to log in before you can comment on or make changes to this bug.
Description Andreas Kuhl 2010-06-22 10:11:43 UTC 
Version:           unspecified (using Devel) 
OS:                Linux

I run KWin with compositing and blur effect enabled. KDE's overall memory consumption increases from ~900 MB to over 1.9 GB, then the system becomes quite unresponsive dued to swapping. Restarting KWin lets the memory consumption drop back to ~900MB.
I tried to pinpoint the error source by disabling plugins one by one. When I disable the blur plugin, the memory consumption no longer increases. Turning it back on makes the problem occur again.

Reproducible: Always



Expected Results:  
Memory consumtion would stay somewhat stable.
Comment 1 Andreas Kuhl 2010-06-22 10:17:50 UTC 
Additional information: KWins memory consumption seems to stay more or less stable but Xorgs memory footprint grows insanely large. Nevertheless I think the problem lies within KWin as Xorgs memory consumption drops when restarting KWin.

I run an ATI MobilityRadion X1800 graphics card with the legacy fglrx driver. Unfortunally, I cannot test with radeon driver since it won't work with my graphics card.
Next week I will (hopefully) recieve my new laptop and can test with the latest fglrx driver if this makes any difference.
Comment 2 Andreas Kuhl 2010-06-22 10:18:40 UTC 
Running KWin REV 1139384.
Comment 3 Max 2010-07-18 10:06:13 UTC 
Created attachment 49276 [details]
sysprof profile with blur
Comment 4 Max 2010-07-18 10:06:58 UTC 
Created attachment 49277 [details]
sysprof profile without the blur effect enabled
Comment 5 Max 2010-07-18 10:16:43 UTC 
I finally got round to running sysprof on my system. I did 6 tests, 3 with blur, 3 without, under the same stress conditions(5 open windows, a bit of moving them about, resizing, etc). I've only attached two files here, because the others are almost identical.  The conclusion of the tests?

Kwin stays at about 34% under normal load, without the blur plugin. With it enabled, it skyrockets to 55%(a good 70% more than without blur.) I'll also attach some screenshots of the test results, in order for you to be able to catch an easier glimpse of them.
Comment 6 Max 2010-07-18 10:19:06 UTC 
Oh, crap, people. Wrong tab!!! could someone please delete these comments? I'm really sorry.
Comment 7 Andreas Kuhl 2010-11-26 10:39:54 UTC 
Seems fixed now in KDE SC 4.6 Beta 1. At least, no longer any suspicious memory/cpu consumption...
Comment 8 Richard 2010-12-10 20:16:22 UTC 
*** Bug 250398 has been marked as a duplicate of this bug. ***
Comment 9 Richard 2010-12-10 20:19:17 UTC 
(In reply to comment #7)
> Seems fixed now in KDE SC 4.6 Beta 1. At least, no longer any suspicious
> memory/cpu consumption...

Is it possible for this fix to be backported to 4.5.5? It is a major usability issue considering that Blur is enabled by default and it is not obvious that Blur is the cause.