Open Bug 844251 Opened 12 years ago Updated 2 years ago

Avoid using system wide GDI Lock causing large hangs

Categories

(Core :: Graphics, defect)

Product:
Core
Component:
Graphics
Platform:
x86
macOS
Type:
defect

Tracking

()

People

(Reporter: BenWa, Unassigned)

Details

(Whiteboard: [Snappy]) 

From what I gather the GDI Lock is a system wide lock and thus it's performance is similar to main thread IO, it can block for some unbounded amount of time which is not proportional to drawing complexity.

Here's a bit of information on this I found:
http://www.passmark.com/support/performancetest/2d_windows7_performance.htm
http://blogs.msdn.com/b/e7/archive/2009/04/25/engineering-windows-7-for-graphics-performance.aspx
It would be nice if someone can find steps to reproduce this. I imagine however that breaking on NtGdiDdDDILock (in wgdi32.pdb) might be sufficient to debug this. Perhaps we can find a way to avoid calling this on windows 7 as suggest by the msdn.com link above.
Whiteboard: [Snappy]
I can reproduce the NtGdiDdDDILock problem on windows7
See https://bugzilla.mozilla.org/show_bug.cgi?id=1087827
Severity: normal → S3
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