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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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7
Kernel/API/FB.h
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@ -38,9 +38,12 @@ ALWAYS_INLINE int fb_set_buffer(int fd, int index)
return ioctl(fd, FB_IOCTL_SET_BUFFER, index);
}
ALWAYS_INLINE int fb_flush_buffer(int fd, FBRect* rect)
ALWAYS_INLINE int fb_flush_buffers(int fd, FBRect const* rects, unsigned count)
{
return ioctl(fd, FB_IOCTL_FLUSH_BUFFER, rect);
FBRects fb_rects;
fb_rects.count = count;
fb_rects.rects = rects;
return ioctl(fd, FB_IOCTL_FLUSH_BUFFERS, &fb_rects);
}
__END_DECLS