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locking/ww_mutex: Improve test to cover acquire context changes 

Currently each thread starts an acquire context only once, and
performs all its loop iterations under it.

This means that the Wound/Wait relations between threads are fixed.

To make things a little more realistic and cover more of the
functionality with the test, open a new acquire context for each loop.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2017-03-03 13:57:56 +01:00 committed by Ingo Molnar
parent 383776fa75
commit bf7b3ac2e3
1 changed files with 7 additions and 8 deletions
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15
kernel/locking/test-ww_mutex.c
View File

@ -398,12 +398,11 @@ static void stress_inorder_work(struct work_struct *work)
if (!order)
return;
ww_acquire_init(&ctx, &ww_class);
do {
int contended = -1;
int n, err;
ww_acquire_init(&ctx, &ww_class);
retry:
err = 0;
for (n = 0; n < nlocks; n++) {
@ -433,9 +432,9 @@ static void stress_inorder_work(struct work_struct *work)
__func__, err);
break;
}
} while (--stress->nloops);
ww_acquire_fini(&ctx);
ww_acquire_fini(&ctx);
} while (--stress->nloops);
kfree(order);
kfree(stress);
@ -470,9 +469,9 @@ static void stress_reorder_work(struct work_struct *work)
kfree(order);
order = NULL;
ww_acquire_init(&ctx, &ww_class);
do {
ww_acquire_init(&ctx, &ww_class);
list_for_each_entry(ll, &locks, link) {
err = ww_mutex_lock(ll->lock, &ctx);
if (!err)
@ -495,9 +494,9 @@ static void stress_reorder_work(struct work_struct *work)
dummy_load(stress);
list_for_each_entry(ll, &locks, link)
ww_mutex_unlock(ll->lock);
} while (--stress->nloops);
ww_acquire_fini(&ctx);
ww_acquire_fini(&ctx);
} while (--stress->nloops);
out:
list_for_each_entry_safe(ll, ln, &locks, link)