benchmarks: Add gem_exec_fault

If we specify an unobtainable alignment (e.g, 63bits) the kernel will
eviction the object from the GTT and fail to rebind it. We can use this,
to measure how long it takes to move objects around in the GTT by
running execbuf followed by the unbind. For small objects, this will be
dominated by the nop execution time, but for larger objects this will be
ratelimited by how fast we can rewrite the PTE.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 22 insertions, 0 deletions

diff --git a/benchmarks/ezbench.d/gem_exec_fault.test b/benchmarks/ezbench.d/gem_exec_fault.test
new file mode 100644
index 00000000..e9f2fcdd
--- /dev/null
+++ b/benchmarks/ezbench.d/gem_exec_fault.test
@@ -0,0 +1,22 @@
+[ -e $IGT_BENCHMARKS/gem_exec_fault ] || return 1
+sudo -n true || return 1
+
+ring=rcs # rcs bcs vcs vecs all
+while read x size; do
+    name="gem:exec:fault:$size"
+    test_name="$test_name $name"
+    eval "${name}_run() { sudo $IGT_BENCHMARKS/gem_exec_fault -s $x -e $ring -r \$1 ; }"
+
+    name="gem:exec:fault:$size:forked"
+    test_name="$test_name $name"
+    eval "${name}_run() { sudo $IGT_BENCHMARKS/gem_exec_fault -f -s $x -e $ring -r \$1 ; }"
+done<<SIZES
+4096		4KiB
+65536		64KiB
+1048576		1MiB
+16777216	16MiB
+268435456	256MiB
+SIZES
+
+test_exec_time=3
+test_invert=1