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WindowServer: Coalesce flushing buffers into one ioctl() call

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We regularily need to flush many rectangles, so instead of making many
expensive ioctl() calls to the framebuffer driver, collect the
rectangles and only make one call. And if we have too many rectangles
then it may be cheaper to just update the entire region, in which case
we simply convert them all into a union and just flush that one
rectangle instead.
This commit is contained in:
Tom 2021-06-26 11:04:01 -06:00 • committed by Andreas Kling
parent 56cd0f929e
commit 38af4c29e6
7 changed files with 123 additions and 31 deletions
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30
Kernel/Graphics/VirtIOGPU/VirtIOFrameBufferDevice.cpp
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@ -147,18 +147,26 @@ int VirtIOFrameBufferDevice::ioctl(FileDescription&, unsigned request, FlatPtr a
return -EFAULT;
return 0;
}
case FB_IOCTL_FLUSH_BUFFER: {
FBRect user_dirty_rect;
if (!copy_from_user(&user_dirty_rect, (FBRect*)arg))
case FB_IOCTL_FLUSH_BUFFERS: {
FBRects user_dirty_rects;
if (!copy_from_user(&user_dirty_rects, (FBRects*)arg))
return -EFAULT;
VirtIOGPURect dirty_rect {
.x = user_dirty_rect.x,
.y = user_dirty_rect.y,
.width = user_dirty_rect.width,
.height = user_dirty_rect.height
};
if (m_are_writes_active)
flush_dirty_window(dirty_rect);
if (Checked<unsigned>::multiplication_would_overflow(user_dirty_rects.count, sizeof(FBRect)))
return -EFAULT;
for (unsigned i = 0; i < user_dirty_rects.count; i++) {
FBRect user_dirty_rect;
if (!copy_from_user(&user_dirty_rect, &user_dirty_rects.rects[i]))
return -EFAULT;
if (m_are_writes_active) {
VirtIOGPURect dirty_rect {
.x = user_dirty_rect.x,
.y = user_dirty_rect.y,
.width = user_dirty_rect.width,
.height = user_dirty_rect.height
};
flush_dirty_window(dirty_rect);
}
}
return 0;
}
default: