From 94411f9b9fffe4dd875dfaa0a0a2172083179572 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 30 May 2018 10:57:27 +0100 Subject: lib: Align ring measurement to timer After hitting the SIGINT from execbuf, wait until the next timer signal before trying again. This aligns the start of the ioctl to the timer, hopefully maximising the amount of time we have for processing before the next signal -- trying to prevent the case where we are scheduled out in the middle of processing and so hit the timer signal too early. References: https://bugs.freedesktop.org/show_bug.cgi?id=106695 Signed-off-by: Chris Wilson Acked-by: Antonio Argenziano --- lib/i915/gem_ring.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'lib') diff --git a/lib/i915/gem_ring.c b/lib/i915/gem_ring.c index 7d64165e..0c061000 100644 --- a/lib/i915/gem_ring.c +++ b/lib/i915/gem_ring.c @@ -96,6 +96,8 @@ __gem_measure_ring_inflight(int fd, unsigned int engine, enum measure_ring_flags if (last == count) break; + /* sleep until the next timer interrupt (woken on signal) */ + pause(); last = count; } while (1); -- cgit v1.2.3