From: Qin Chuanyu <qinchuanyu@huawei•com>
To: <mst@redhat•com>, <jasowang@redhat•com>
Cc: <kvm@vger•kernel.org>, <netdev@vger•kernel.org>
Subject: [PATCH] vhost: wake up worker outside spin_lock
Date: Fri, 7 Jun 2013 21:50:16 +0800 [thread overview]
Message-ID: <51B1E518.1070003@huawei.com> (raw)
the wake_up_process func is included by spin_lock/unlock in
vhost_work_queue,
but it could be done outside the spin_lock.
I have test it with kernel 3.0.27 and guest suse11-sp2 using iperf,
the num as below.
original modified
thread_num tp(Gbps) vhost(%) | tp(Gbps) vhost(%)
1 9.59 28.82 | 9.59 27.49
8 9.61 32.92 | 9.62 26.77
64 9.58 46.48 | 9.55 38.99
256 9.6 63.7 | 9.6 52.59
Signed-off-by: Chuanyu Qin <qinchuanyu@huawei•com>
---
drivers/vhost/vhost.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 94dbd25..dcc7a17 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -146,9 +146,11 @@ static inline void vhost_work_queue(struct
vhost_dev *dev,
if (list_empty(&work->node)) {
list_add_tail(&work->node, &dev->work_list);
work->queue_seq++;
+ spin_unlock_irqrestore(&dev->work_lock, flags);
wake_up_process(dev->worker);
+ } else {
+ spin_unlock_irqrestore(&dev->work_lock, flags);
}
- spin_unlock_irqrestore(&dev->work_lock, flags);
}
void vhost_poll_queue(struct vhost_poll *poll)
--
1.7.3.1.msysgit.0
next reply other threads:[~2013-06-07 13:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-07 13:50 Qin Chuanyu [this message]
2013-06-07 14:05 ` [PATCH] vhost: wake up worker outside spin_lock Asias He
2013-06-09 9:47 ` Michael S. Tsirkin
-- strict thread matches above, loose matches on Subject: below --
2013-06-07 10:59 Qinchuanyu
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