linux-kernel - Re: [PATCH] Drivers: hv: vmbus: Optimize vmbus_on

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Message-ID: <Yy18HV8iAFLhF3P/@liuwe-devbox-debian-v2>
Date:   Fri, 23 Sep 2022 09:27:57 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Saurabh Sengar <ssengar@...ux.microsoft.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH] Drivers: hv: vmbus: Optimize vmbus_on_event

On Mon, Aug 15, 2022 at 03:31:41PM +0000, Wei Liu wrote:
> On Mon, Jul 25, 2022 at 02:37:28AM -0700, Saurabh Sengar wrote:
> > In the vmbus_on_event loop, 2 jiffies timer will not serve the purpose if
> > callback_fn takes longer. For effective use move this check inside of
> > callback functions where needed. Out of all the VMbus drivers using
> > vmbus_on_event, only storvsc has a high packet volume, thus add this limit
> > only in storvsc callback for now.
> > There is no apparent benefit of loop itself because this tasklet will be
> > scheduled anyway again if there are packets left in ring buffer. This
> > patch removes this unnecessary loop as well.
> > 
> > Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
> 
> Unfortunately this missed the recent merge window so it will be picked
> up for the next release.
> 

Applied to hyperv-next. Thanks.