[lustre-devel] [PATCH 23/37] lnet: o2iblnd: use need_resched()
James Simmons
jsimmons at infradead.org
Wed Jul 15 13:45:04 PDT 2020
From: Mr NeilBrown <neilb at suse.de>
Rather than using a counter to decide when to drop
the lock and see if we need to reshedule we can
use need_resched(), which is a precise test instead of a guess.
WC-bug-id: https://jira.whamcloud.com/browse/LU-12678
Lustre-commit: dcd799269f693 ("LU-12678 o2iblnd: use need_resched()")
Signed-off-by: Mr NeilBrown <neilb at suse.de>
Reviewed-on: https://review.whamcloud.com/39125
Reviewed-by: James Simmons <jsimmons at infradead.org>
Reviewed-by: Shaun Tancheff <shaun.tancheff at hpe.com>
Reviewed-by: Chris Horn <chris.horn at hpe.com>
Reviewed-by: Oleg Drokin <green at whamcloud.com>
Signed-off-by: James Simmons <jsimmons at infradead.org>
---
net/lnet/klnds/o2iblnd/o2iblnd.h | 2 --
net/lnet/klnds/o2iblnd/o2iblnd_cb.c | 5 +----
2 files changed, 1 insertion(+), 6 deletions(-)
diff --git a/net/lnet/klnds/o2iblnd/o2iblnd.h b/net/lnet/klnds/o2iblnd/o2iblnd.h
index f60a69d..9a2fb42 100644
--- a/net/lnet/klnds/o2iblnd/o2iblnd.h
+++ b/net/lnet/klnds/o2iblnd/o2iblnd.h
@@ -67,8 +67,6 @@
#include <linux/lnet/lib-lnet.h>
#define IBLND_PEER_HASH_SIZE 101 /* # peer_ni lists */
-/* # scheduler loops before reschedule */
-#define IBLND_RESCHED 100
#define IBLND_N_SCHED 2
#define IBLND_N_SCHED_HIGH 4
diff --git a/net/lnet/klnds/o2iblnd/o2iblnd_cb.c b/net/lnet/klnds/o2iblnd/o2iblnd_cb.c
index 3b9d10d..2c670a33 100644
--- a/net/lnet/klnds/o2iblnd/o2iblnd_cb.c
+++ b/net/lnet/klnds/o2iblnd/o2iblnd_cb.c
@@ -3605,7 +3605,6 @@ static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
unsigned long flags;
struct ib_wc wc;
int did_something;
- int busy_loops = 0;
int rc;
init_waitqueue_entry(&wait, current);
@@ -3621,11 +3620,10 @@ static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
spin_lock_irqsave(&sched->ibs_lock, flags);
while (!kiblnd_data.kib_shutdown) {
- if (busy_loops++ >= IBLND_RESCHED) {
+ if (need_resched()) {
spin_unlock_irqrestore(&sched->ibs_lock, flags);
cond_resched();
- busy_loops = 0;
spin_lock_irqsave(&sched->ibs_lock, flags);
}
@@ -3718,7 +3716,6 @@ static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
spin_unlock_irqrestore(&sched->ibs_lock, flags);
schedule();
- busy_loops = 0;
remove_wait_queue(&sched->ibs_waitq, &wait);
spin_lock_irqsave(&sched->ibs_lock, flags);
--
1.8.3.1
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