Issue 3182: Flash consumes CPU even if audio or video is not playing,
possibly due to SetUnhandledExceptionFilter
http://code.google.com/p/chromium/issues/detail?id=3182
New issue report by [EMAIL PROTECTED]:
What steps will reproduce the problem?
1. Open up a web page with 3/4 flash videos
2. Play then and then stop them all
3. Flash keeps consuming about 40% CPU.
What is the expected output? What do you see instead?
CPU usage should be less than 5% ideally 0. It is less in other Firefox and
Safari
During debugging this symptom, flash is often caught stuck in kernel32!
SetUnhandledExceptionFilter (which was calling kernel32!VirtualQuery
repeatedly) during the processing of WM_TIMERs.
cpu pointed out that: flash calls SetUnhandledExceptionFilter in our thread
constantly (looks like basically in every call). It never seems to set the
previous handler back (which we set to catch crashes by generating
minidumps and sending them to us). So what we do is wrap the entire thread
function in a SEH handler and in the _except block we reset the unhandled
exception filter back to us and re-throw the exception.
This could be a reason for SetUnhandledExceptionFilter taking longer than
usual.
Apparently, in flash 10, it doesn't call SetUnhandledExceptionFilter
anymore (needs to be verified). In that case we won't need to wrap the
exception filter.
Issue attributes:
Status: Assigned
Owner: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED],
[EMAIL PROTECTED]
Labels: Type-Bug Pri-2 OS-All Area-WebKit flash Plugins
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