Commit f87dc808 authored by Joel Fernandes (Google)'s avatar Joel Fernandes (Google) Committed by Paul E. McKenney
Browse files

rcuperf: Add ability to increase object allocation size 



This allows us to increase memory pressure dynamically using a new
rcuperf boot command line parameter called 'rcumult'.

Signed-off-by: default avatarJoel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 35315936

kernel/rcu/rcuperf.c

+4 −1
Original line number Diff line number Diff line
@@ -88,6 +88,7 @@ torture_param(bool, shutdown, RCUPERF_SHUTDOWN, 
torture_param(int, verbose, 1, "Enable verbose debugging printk()s");

torture_param(int, writer_holdoff, 0, "Holdoff (us) between GPs, zero to disable");

torture_param(int, kfree_rcu_test, 0, "Do we run a kfree_rcu() perf test?");

torture_param(int, kfree_mult, 1, "Multiple of kfree_obj size to allocate.");



static char *perf_type = "rcu";

module_param(perf_type, charp, 0444);
@@ -635,7 +636,7 @@ kfree_perf_thread(void *arg) 
		}



		for (i = 0; i < kfree_alloc_num; i++) {

			alloc_ptr = kmalloc(sizeof(struct kfree_obj), GFP_KERNEL);

			alloc_ptr = kmalloc(kfree_mult * sizeof(struct kfree_obj), GFP_KERNEL);

			if (!alloc_ptr)

				return -ENOMEM;
@@ -722,6 +723,8 @@ kfree_perf_init(void) 
		schedule_timeout_uninterruptible(1);

	}



	pr_alert("kfree object size=%lu\n", kfree_mult * sizeof(struct kfree_obj));



	kfree_reader_tasks = kcalloc(kfree_nrealthreads, sizeof(kfree_reader_tasks[0]),

			       GFP_KERNEL);

	if (kfree_reader_tasks == NULL) {