From 57dd924e541a98219bf3a508623db2e0c07e75a7 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 10 Mar 2017 10:57:33 +0000 Subject: [PATCH] locking/ww-mutex: Limit stress test to 2 seconds Use a timeout rather than a fixed number of loops to avoid running for very long periods, such as under the kbuilder VMs. Reported-by: kernel test robot Signed-off-by: Chris Wilson Signed-off-by: Peter Zijlstra (Intel) Cc: Boqun Feng Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/20170310105733.6444-1-chris@chris-wilson.co.uk Signed-off-by: Ingo Molnar --- kernel/locking/test-ww_mutex.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c index 90d8d8879969..39f56c870051 100644 --- a/kernel/locking/test-ww_mutex.c +++ b/kernel/locking/test-ww_mutex.c @@ -353,8 +353,8 @@ static int test_cycle(unsigned int ncpus) struct stress { struct work_struct work; struct ww_mutex *locks; + unsigned long timeout; int nlocks; - int nloops; }; static int *get_random_order(int count) @@ -434,7 +434,7 @@ static void stress_inorder_work(struct work_struct *work) } ww_acquire_fini(&ctx); - } while (--stress->nloops); + } while (!time_after(jiffies, stress->timeout)); kfree(order); kfree(stress); @@ -496,7 +496,7 @@ static void stress_reorder_work(struct work_struct *work) ww_mutex_unlock(ll->lock); ww_acquire_fini(&ctx); - } while (--stress->nloops); + } while (!time_after(jiffies, stress->timeout)); out: list_for_each_entry_safe(ll, ln, &locks, link) @@ -522,7 +522,7 @@ static void stress_one_work(struct work_struct *work) __func__, err); break; } - } while (--stress->nloops); + } while (!time_after(jiffies, stress->timeout)); kfree(stress); } @@ -532,7 +532,7 @@ static void stress_one_work(struct work_struct *work) #define STRESS_ONE BIT(2) #define STRESS_ALL (STRESS_INORDER | STRESS_REORDER | STRESS_ONE) -static int stress(int nlocks, int nthreads, int nloops, unsigned int flags) +static int stress(int nlocks, int nthreads, unsigned int flags) { struct ww_mutex *locks; int n; @@ -574,7 +574,7 @@ static int stress(int nlocks, int nthreads, int nloops, unsigned int flags) INIT_WORK(&stress->work, fn); stress->locks = locks; stress->nlocks = nlocks; - stress->nloops = nloops; + stress->timeout = jiffies + 2*HZ; queue_work(wq, &stress->work); nthreads--; @@ -618,15 +618,15 @@ static int __init test_ww_mutex_init(void) if (ret) return ret; - ret = stress(16, 2*ncpus, 1<<10, STRESS_INORDER); + ret = stress(16, 2*ncpus, STRESS_INORDER); if (ret) return ret; - ret = stress(16, 2*ncpus, 1<<10, STRESS_REORDER); + ret = stress(16, 2*ncpus, STRESS_REORDER); if (ret) return ret; - ret = stress(4095, hweight32(STRESS_ALL)*ncpus, 1<<12, STRESS_ALL); + ret = stress(4095, hweight32(STRESS_ALL)*ncpus, STRESS_ALL); if (ret) return ret; -- 2.45.2