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smrstress: Add 'publishing' fences to operations on smrs_current.

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Reported and tested by:	andrew
Reviewed by:	jeff
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D23440
This commit is contained in:
Konstantin Belousov 2020-01-31 20:30:50 +00:00
parent 19e5e202c7
commit 4b919d5cdd
1 changed files with 2 additions and 1 deletions
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3
tools/uma/smrstress/smrstress.c
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@ -84,7 +84,7 @@ smrs_read(void)
/* Wait for the writer to exit. */
while (smrs_completed == 0) {
smr_enter(smrs_smr);
cur = (void *)atomic_load_ptr(&smrs_current);
cur = (void *)atomic_load_acq_ptr(&smrs_current);
if (cur->generation == -1)
smrs_error(cur, "read early: Use after free!\n");
atomic_add_int(&cur->count, 1);
@ -107,6 +107,7 @@ smrs_write(void)
for (i = 0; i < smrs_iterations; i++) {
cur = uma_zalloc_smr(smrs_zone, M_WAITOK);
atomic_thread_fence_rel();
cur = (void *)atomic_swap_ptr(&smrs_current, (uintptr_t)cur);
uma_zfree_smr(smrs_zone, cur);
}