提交 a8ec14d4 编写于 作者: D Davidlohr Bueso 提交者: Linus Torvalds

lib/interval_tree_test.c: allow users to limit scope of endpoint

Add a 'max_endpoint' parameter such that users may easily limit the size
of the intervals that are randomly generated.

Link: http://lkml.kernel.org/r/20170518174936.20265-4-dave@stgolabs.netSigned-off-by: NDavidlohr Bueso <dbueso@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 a54dae03
......@@ -16,6 +16,7 @@ __param(int, perf_loops, 100000, "Number of iterations modifying the tree");
__param(int, nsearches, 100, "Number of searches to the interval tree");
__param(int, search_loops, 10000, "Number of iterations searching the tree");
__param(uint, max_endpoint, ~0, "Largest value for the interval's endpoint");
static struct rb_root root = RB_ROOT;
static struct interval_tree_node *nodes = NULL;
......@@ -40,18 +41,20 @@ static void init(void)
int i;
for (i = 0; i < nnodes; i++) {
u32 a = prandom_u32_state(&rnd);
u32 b = prandom_u32_state(&rnd);
if (a <= b) {
nodes[i].start = a;
nodes[i].last = b;
} else {
nodes[i].start = b;
nodes[i].last = a;
}
u32 b = (prandom_u32_state(&rnd) >> 4) % max_endpoint;
u32 a = (prandom_u32_state(&rnd) >> 4) % b;
nodes[i].start = a;
nodes[i].last = b;
}
/*
* Limit the search scope to what the user defined.
* Otherwise we are merely measuring empty walks,
* which is pointless.
*/
for (i = 0; i < nsearches; i++)
queries[i] = prandom_u32_state(&rnd);
queries[i] = (prandom_u32_state(&rnd) >> 4) % max_endpoint;
}
static int interval_tree_test_init(void)
......
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