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WindowServer: Process multiple mouse packets at the same time

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We can often get multiple packets in one read() syscall, so let's know
how to deal with that to reduce syscall traffic during interactivity.
This commit is contained in:
Andreas Kling
2020-02-07 11:30:11 +01:00
parent 083b81a566
commit 982eb996f7
1 changed files with 12 additions and 6 deletions
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18
Servers/WindowServer/EventLoop.cpp
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@@ -94,12 +94,18 @@ void EventLoop::drain_mouse()
MousePacket state;
state.buttons = screen.mouse_button_state();
unsigned buttons = state.buttons;
for (;;) {
MousePacket packet;
ssize_t nread = read(m_mouse_fd, &packet, sizeof(MousePacket));
if (nread == 0)
break;
ASSERT(nread == sizeof(packet));
MousePacket packets[32];
ssize_t nread = read(m_mouse_fd, &packets, sizeof(packets));
if (nread < 0) {
perror("EventLoop::drain_mouse read");
return;
}
size_t npackets = nread / sizeof(MousePacket);
if (!npackets)
return;
for (size_t i = 0; i < npackets; ++i) {
auto& packet = packets[i];
#ifdef WSMESSAGELOOP_DEBUG
dbgprintf("EventLoop: Mouse X %d, Y %d, Z %d, relative %d\n", packet.x, packet.y, packet.z, packet.is_relative);
#endif