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rcuperf: Add ability to increase object allocation size

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

Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Joel Fernandes (Google) 2020-03-16 12:32:26 -04:00 committed by Paul E. McKenney
parent 353159365e
commit f87dc80800
1 changed files with 4 additions and 1 deletions
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5
kernel/rcu/rcuperf.c
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@ -88,6 +88,7 @@ torture_param(bool, shutdown, RCUPERF_SHUTDOWN,
torture_param(int, verbose, 1, "Enable verbose debugging printk()s"); 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, 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_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"; static char *perf_type = "rcu";
module_param(perf_type, charp, 0444); module_param(perf_type, charp, 0444);
@ -635,7 +636,7 @@ kfree_perf_thread(void *arg)
} }
for (i = 0; i < kfree_alloc_num; i++) { 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) if (!alloc_ptr)
return -ENOMEM; return -ENOMEM;
@ -722,6 +723,8 @@ kfree_perf_init(void)
schedule_timeout_uninterruptible(1); 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]), kfree_reader_tasks = kcalloc(kfree_nrealthreads, sizeof(kfree_reader_tasks[0]),
GFP_KERNEL); GFP_KERNEL);
if (kfree_reader_tasks == NULL) { if (kfree_reader_tasks == NULL) {