Commit 12907efd authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm verity: have verify_wq use WQ_HIGHPRI if "try_verify_in_tasklet" 



Allow verify_wq to preempt softirq since verification in tasklet will
fall-back to using it for error handling (or if the bufio cache
doesn't have required hashes).

Suggested-by: default avatarNathan Huckleberry <nhuck@google.com>
Signed-off-by: default avatarMike Snitzer <snitzer@kernel.org>
parent 43fa47cb

drivers/md/dm-verity-target.c

+11 −1
Original line number Diff line number Diff line
@@ -1151,6 +1151,7 @@ static int verity_ctr(struct dm_target *ti, unsigned argc, char **argv) 
	struct dm_verity_sig_opts verify_args = {0};

	struct dm_arg_set as;

	unsigned int num;

	unsigned int wq_flags;

	unsigned long long num_ll;

	int r;

	int i;
@@ -1388,7 +1389,16 @@ static int verity_ctr(struct dm_target *ti, unsigned argc, char **argv) 
	}



	/* WQ_UNBOUND greatly improves performance when running on ramdisk */

	v->verify_wq = alloc_workqueue("kverityd", WQ_MEM_RECLAIM | WQ_UNBOUND, num_online_cpus());

	wq_flags = WQ_MEM_RECLAIM | WQ_UNBOUND;

	if (v->use_tasklet) {

		/*

		 * Allow verify_wq to preempt softirq since verification in

		 * tasklet will fall-back to using it for error handling

		 * (or if the bufio cache doesn't have required hashes).

		 */

		wq_flags |= WQ_HIGHPRI;

	}

	v->verify_wq = alloc_workqueue("kverityd", wq_flags, num_online_cpus());

	if (!v->verify_wq) {

		ti->error = "Cannot allocate workqueue";

		r = -ENOMEM;