From: Stephen Hemminger <stephen@networkplumber.org>
To: Changpeng Liu <changpeng.liu@intel.com>
Cc: dev@dpdk.org, Maxime Coquelin <maxime.coquelin@redhat.com>,
Chenbo Xia <chenbo.xia@intel.com>
Subject: Re: [PATCH] vhost: use try_lock in rte_vhost_vring_call
Date: Tue, 6 Sep 2022 14:15:38 -0700 [thread overview]
Message-ID: <20220906141538.7aa0876b@hermes.local> (raw)
In-Reply-To: <20220906022225.17215-1-changpeng.liu@intel.com>
On Tue, 6 Sep 2022 10:22:25 +0800
Changpeng Liu <changpeng.liu@intel.com> wrote:
> Note that this function is in data path, so the thread context
> may not same as socket messages processing context, by using
> try_lock here, users can have another try in case of VQ's access
> lock is held by `vhost-events` thread.
>
> Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
> ---
> lib/vhost/vhost.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/lib/vhost/vhost.c b/lib/vhost/vhost.c
> index 60cb05a0ff..072d2acb7b 100644
> --- a/lib/vhost/vhost.c
> +++ b/lib/vhost/vhost.c
> @@ -1329,7 +1329,11 @@ rte_vhost_vring_call(int vid, uint16_t vring_idx)
> if (!vq)
> return -1;
>
> - rte_spinlock_lock(&vq->access_lock);
> + if (!rte_spinlock_trylock(&vq->access_lock)) {
> + VHOST_LOG_CONFIG(dev->ifname, DEBUG,
> + "failed to kick guest, virtqueue busy.\n");
> + return -1;
> + }
>
If it is a race, logging a message is not a good idea; the log will fill
with this noise.
Instead make it statistic that can be seen by xstats.
next prev parent reply other threads:[~2022-09-06 21:15 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-06 2:22 Changpeng Liu
2022-09-06 21:15 ` Stephen Hemminger [this message]
2022-09-07 0:40 ` Liu, Changpeng
2022-09-20 7:12 ` Maxime Coquelin
2022-09-20 2:24 ` Xia, Chenbo
2022-09-20 2:34 ` Liu, Changpeng
2022-09-20 2:53 ` Xia, Chenbo
2022-09-20 3:00 ` Liu, Changpeng
2022-09-20 7:23 ` Maxime Coquelin
2022-09-20 7:30 ` Maxime Coquelin
2022-09-20 7:19 ` Maxime Coquelin
2022-09-20 7:29 ` Liu, Changpeng
2022-09-20 7:34 ` Maxime Coquelin
2022-09-20 7:45 ` Liu, Changpeng
2022-09-20 8:12 ` Maxime Coquelin
2022-09-20 8:43 ` Liu, Changpeng
2022-09-21 9:41 ` Maxime Coquelin
2022-09-21 9:52 ` Liu, Changpeng
2022-10-11 11:56 ` Maxime Coquelin
2022-10-12 6:40 ` [PATCH v2] vhost: add new `rte_vhost_vring_call_nonblock` API Changpeng Liu
2022-10-13 7:56 ` Maxime Coquelin
2022-10-17 6:46 ` Xia, Chenbo
2022-10-17 7:17 ` Liu, Changpeng
2022-10-17 7:14 ` [PATCH v3] " Changpeng Liu
2022-10-17 7:39 ` Xia, Chenbo
2022-10-17 7:50 ` Liu, Changpeng
2022-10-17 7:48 ` [PATCH v4] " Changpeng Liu
2022-10-19 5:27 ` Xia, Chenbo
2022-10-26 9:24 ` Xia, Chenbo
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