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WindowServer: Slurp all available client messages when checking them.

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We were reading one client message per client per event loop iteration.
That was not very snappy. Make the sockets non-blocking and read() until
there are no messages left.

It would be even better to make as few calls to read() as possible to
reduce context switching, but this is already a huge improvement.
This commit is contained in:
Andreas Kling
2019-02-15 11:43:43 +01:00
parent 29c49356e3
commit fbcc8ab840
3 changed files with 33 additions and 27 deletions
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24
WindowServer/WSMessageLoop.cpp
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@@ -40,7 +40,7 @@ int WSMessageLoop::exec()
m_server_process->sys$unlink("/wsportal");
m_server_fd = m_server_process->sys$socket(AF_LOCAL, SOCK_STREAM, 0);
m_server_fd = m_server_process->sys$socket(AF_LOCAL, SOCK_STREAM | SOCK_NONBLOCK, 0);
ASSERT(m_server_fd >= 0);
sockaddr_un address;
address.sun_family = AF_LOCAL;
@@ -244,9 +244,17 @@ void WSMessageLoop::wait_for_message()
}
WSClientConnection::for_each_client([&] (WSClientConnection& client) {
if (bitmap.get(client.fd())) {
byte buffer[4096];
ssize_t nread = m_server_process->sys$read(client.fd(), buffer, sizeof(WSAPI_ClientMessage));
on_receive_from_client(client.client_id(), buffer, nread);
for (;;) {
WSAPI_ClientMessage message;
// FIXME: Don't go one message at a time, that's so much context switching, oof.
ssize_t nread = m_server_process->sys$read(client.fd(), &message, sizeof(WSAPI_ClientMessage));
if (nread == 0)
break;
if (nread < 0) {
ASSERT_NOT_REACHED();
}
on_receive_from_client(client.client_id(), message);
}
}
});
}
@@ -313,18 +321,14 @@ void WSMessageLoop::notify_client_died(int client_id)
post_message(client, make<WSClientDisconnectedNotification>(client_id));
}
ssize_t WSMessageLoop::on_receive_from_client(int client_id, const byte* data, size_t size)
void WSMessageLoop::on_receive_from_client(int client_id, const WSAPI_ClientMessage& message)
{
// FIXME: This should not be necessary.. why is this necessary?
while (!running())
Scheduler::yield();
LOCKER(m_lock);
WSClientConnection* client = WSClientConnection::ensure_for_client_id(client_id);
ASSERT(size == sizeof(WSAPI_ClientMessage));
auto& message = *reinterpret_cast<const WSAPI_ClientMessage*>(data);
switch (message.type) {
case WSAPI_ClientMessage::Type::CreateMenubar:
post_message(client, make<WSAPICreateMenubarRequest>(client_id));
@@ -386,6 +390,4 @@ ssize_t WSMessageLoop::on_receive_from_client(int client_id, const byte* data, s
post_message(client, make<WSAPISetGlobalCursorTrackingRequest>(client_id, message.window_id, message.value));
break;
}
server_process().request_wakeup();
return size;
}