1 files changed, 42 insertions, 15 deletions

diff --git a/samples/damon/wsse.c b/samples/damon/wsse.c
index 11be25803274..da052023b099 100644
--- a/samples/damon/wsse.c
+++ b/samples/damon/wsse.c
@@ -12,26 +12,32 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 
+#ifdef MODULE_PARAM_PREFIX
+#undef MODULE_PARAM_PREFIX
+#endif
+#define MODULE_PARAM_PREFIX "damon_sample_wsse."
+
 static int target_pid __read_mostly;
 module_param(target_pid, int, 0600);
 
 static int damon_sample_wsse_enable_store(
 		const char *val, const struct kernel_param *kp);
 
-static const struct kernel_param_ops enable_param_ops = {
+static const struct kernel_param_ops enabled_param_ops = {
 	.set = damon_sample_wsse_enable_store,
 	.get = param_get_bool,
 };
 
-static bool enable __read_mostly;
-module_param_cb(enable, &enable_param_ops, &enable, 0600);
-MODULE_PARM_DESC(enable, "Enable or disable DAMON_SAMPLE_WSSE");
+static bool enabled __read_mostly;
+module_param_cb(enabled, &enabled_param_ops, &enabled, 0600);
+MODULE_PARM_DESC(enabled, "Enable or disable DAMON_SAMPLE_WSSE");
 
 static struct damon_ctx *ctx;
 static struct pid *target_pidp;
 
-static int damon_sample_wsse_after_aggregate(struct damon_ctx *c)
+static int damon_sample_wsse_repeat_call_fn(void *data)
 {
+	struct damon_ctx *c = data;
 	struct damon_target *t;
 
 	damon_for_each_target(t, c) {
@@ -47,9 +53,15 @@ static int damon_sample_wsse_after_aggregate(struct damon_ctx *c)
 	return 0;
 }
 
+static struct damon_call_control repeat_call_control = {
+	.fn = damon_sample_wsse_repeat_call_fn,
+	.repeat = true,
+};
+
 static int damon_sample_wsse_start(void)
 {
 	struct damon_target *target;
+	int err;
 
 	pr_info("start\n");
 
@@ -74,8 +86,11 @@ static int damon_sample_wsse_start(void)
 	}
 	target->pid = target_pidp;
 
-	ctx->callback.after_aggregation = damon_sample_wsse_after_aggregate;
-	return damon_start(&ctx, 1, true);
+	err = damon_start(&ctx, 1, true);
+	if (err)
+		return err;
+	repeat_call_control.data = ctx;
+	return damon_call(ctx, &repeat_call_control);
 }
 
 static void damon_sample_wsse_stop(void)
@@ -85,32 +100,44 @@ static void damon_sample_wsse_stop(void)
 		damon_stop(&ctx, 1);
 		damon_destroy_ctx(ctx);
 	}
-	if (target_pidp)
-		put_pid(target_pidp);
 }
 
+static bool init_called;
+
 static int damon_sample_wsse_enable_store(
 		const char *val, const struct kernel_param *kp)
 {
-	bool enabled = enable;
+	bool is_enabled = enabled;
 	int err;
 
-	err = kstrtobool(val, &enable);
+	err = kstrtobool(val, &enabled);
 	if (err)
 		return err;
 
-	if (enable == enabled)
+	if (enabled == is_enabled)
 		return 0;
 
-	if (enable)
-		return damon_sample_wsse_start();
+	if (enabled) {
+		err = damon_sample_wsse_start();
+		if (err)
+			enabled = false;
+		return err;
+	}
 	damon_sample_wsse_stop();
 	return 0;
 }
 
 static int __init damon_sample_wsse_init(void)
 {
-	return 0;
+	int err = 0;
+
+	init_called = true;
+	if (enabled) {
+		err = damon_sample_wsse_start();
+		if (err)
+			enabled = false;
+	}
+	return err;
 }
 
 module_init(damon_sample_wsse_init);