https://speedometer-preview.netlify.app/?suite=React-Stockcharts&iterationCount=10

I've noticed this on Android but it's possible it affects Linux and Macos too, as they also use
accelerated canvas.

Running ten iterations of react-stockcharts (as in the above URL) uses 805MB of render-texture-hosts. Switching away from the tab does not free this memory, however closing the tab does.

Sotaro, any idea why we are holding on to so many render texture hosts?

(In reply to Jamie Nicol [:jnicol] from comment #0)

https://speedometer-preview.netlify.app/?suite=React-Stockcharts&iterationCount=10

URL did not work for me. Error message was 'No suites selected. "React-Stockcharts" does not exists'.
Does the URL work for you?

Not any more, no. The test was removed from speedometer yesterday. I'll find a different link for it.

Sotaro, can you try this url instead: https://stockcharts--speedometer-preview.netlify.app/?suite=React-Stockcharts

For each iteration, a DrawTargetWebGL was created and a new FrameBuffer was created and they were alive until the test end. At the end of the test, DrawTargetWebGLs and FrameBuffers were deleted, but their destruction did not trigger RemoteTextureOwnerClient::UnregisterTextureOwner(). Then TextureHosts of RemoteTextureOwners remained alive.

RemoteTextureOwnerClient::RegisterTextureOwner() is called in WebGLContext::PushRemoteTexture(). It uses function's argument webgl::SwapChainOptions.

RemoteTextureOwnerClient::UnregisterTextureOwner() is called when its owner swap chain is destructed.

• https://searchfox.org/mozilla-central/rev/603b9fded7a11ff213c0f415198cd637b7c86614/dom/canvas/WebGLContext.cpp#1150

Delete frame buffer happens at HostWebGLContext::DeleteFramebuffer().

Delete frame buffer is requested by ClientWebGLContext::DeleteFramebuffer().

Even when ClientWebGLContext::DeleteFramebuffer() was called, HostWebGLContext::DeleteFramebuffer() was not called when the problem happened. From it, pending commands were not flushed at ClientWebGLContext.

https://hg.mozilla.org/mozilla-central/rev/31fdbc651714