From: kys@exchange.microsoft.com
To: davem@davemloft.net, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, devel@linuxdriverproject.org,
olaf@aepfle.de, apw@canonical.com, jasowang@redhat.com,
leann.ogasawara@canonical.comi, marcelo.cerri@canonical.com,
sthemmin@microsoft.com
Subject: [PATCH 4/6] Drivers: hv: util: Make hv_poll_channel() a little more efficient
Date: Sun, 30 Apr 2017 16:21:17 -0700 [thread overview]
Message-ID: <1493594479-25329-4-git-send-email-kys@exchange.microsoft.com> (raw)
In-Reply-To: <1493594420-25214-1-git-send-email-kys@exchange.microsoft.com>
From: K. Y. Srinivasan <kys@microsoft.com>
The current code unconditionally sends an IPI. If we are running on the
correct CPU and are in interrupt level, we don't need an IPI.
Make this adjustment.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
---
drivers/hv/hyperv_vmbus.h | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 6113e91..fa514be 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -411,6 +411,10 @@ static inline void hv_poll_channel(struct vmbus_channel *channel,
if (!channel)
return;
+ if (in_interrupt() && (channel->target_cpu == smp_processor_id())) {
+ cb(channel);
+ return;
+ }
smp_call_function_single(channel->target_cpu, cb, channel, true);
}
--
1.7.1
next prev parent reply other threads:[~2017-04-30 23:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-30 23:20 [PATCH 0/6] Drivers: hv: Miscellaneous fixes kys
2017-04-30 23:21 ` [PATCH 1/6] Tools: hv: vss: Thaw the filesystem and continue if freeze call has timed out kys
2017-04-30 23:21 ` [PATCH 2/6] tools: hv: properly handle long paths kys
2017-04-30 23:21 ` [PATCH 3/6] Drivers: hv: vmbus: Fix error code returned by vmbus_post_msg() kys
2017-04-30 23:21 ` kys [this message]
2017-04-30 23:21 ` [PATCH 5/6] Drivers: hv: vmbus: Fix rescind handling kys
2017-04-30 23:21 ` [PATCH 6/6] HV: properly delay KVP packets when negotiation is in progress kys
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