https://bugs.freedesktop.org/show_bug.cgi?id=98030

--- Comment #6 from Chris Wilson <ch...@chris-wilson.co.uk> ---
The change in 8f1edf4bd3a1f050ce9eeb5eac45dd1a8f7a6d5e is that we no longer
wakeup and flush writers when space in the write queue becomes available -
instead before we poll() we flush the writers iff NewOutputPending since the
last poll(), i.e.

diff --git a/os/WaitFor.c b/os/WaitFor.c
index 8164c30..5b0c342 100644
--- a/os/WaitFor.c
+++ b/os/WaitFor.c
@@ -207,8 +207,7 @@ WaitForSomething(Bool are_ready)
                 (1000000 / MILLI_PER_SECOND);
             wt = &waittime;
         }
-        if (NewOutputPending)
-            FlushAllOutput();
+       FlushAllOutput();
         /* keep this check close to select() call to minimize race */
         if (dispatchException)
             i = -1;

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