Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 70f5a9c09ae45cc844e5b87654577e0183f1ae09
https://github.com/WebKit/WebKit/commit/70f5a9c09ae45cc844e5b87654577e0183f1ae09
Author: Nathan Solomon <[email protected]>
Date: 2025-03-13 (Thu, 13 Mar 2025)
Changed paths:
M Source/WebKit/GPUProcess/graphics/RemoteRenderingBackend.messages.in
Log Message:
-----------
Use StreamBatched for ReleaseDecomposedGlyphs IPC stream send
https://bugs.webkit.org/show_bug.cgi?id=289551
rdar://146775570
Reviewed by Kimmo Kinnunen.
The RenderObject destructor takes up a considerable number of samples on
traces. As a part of the RenderObject destruction, we remove entries
from the GlyphDisplayListCache. Deleting each RenderingResource causes
an IPC::StreamClientConnection::send() to occur to notify the GPU process
to “ReleaseDecomposedGlyphs”. On traces, we see that
"semaphore_signal_trap @ libsystem_kernel.dylib" is the bottleneck of this
function.
The WebContent Process calls signal() on a semaphore in a shared buffer
between the two processes. The signal() call will wake up the GPU
process which is waiting on the semaphore. Use StreamBatched to
delay calling signal() until a max consecutive “StreamingBatched”
message count is met to then call signal().
This is a performance improvement.
* Source/WebKit/GPUProcess/graphics/RemoteRenderingBackend.messages.in:
Canonical link: https://commits.webkit.org/292098@main
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