linux-kernel - Re: [PATCH] Drivers: hv: vmbus: Deferring per cpu tasks

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Message-ID: <20240726112619.GA10862@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Fri, 26 Jul 2024 04:26:19 -0700
From: Saurabh Singh Sengar <ssengar@...ux.microsoft.com>
To: "Srivatsa S. Bhat" <srivatsa@...il.mit.edu>
Cc: Dexuan Cui <decui@...rosoft.com>,
	Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"wei.liu@...nel.org" <wei.liu@...nel.org>,
	"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Saurabh Singh Sengar <ssengar@...rosoft.com>
Subject: Re: [PATCH] Drivers: hv: vmbus: Deferring per cpu tasks

On Fri, Jul 26, 2024 at 06:34:53AM +0000, Srivatsa S. Bhat wrote:
> On Fri, Jul 26, 2024 at 12:01:33AM +0000, Dexuan Cui wrote:
> > > From: Saurabh Singh Sengar <ssengar@...ux.microsoft.com>
> > > Sent: Thursday, July 25, 2024 8:35 AM
> > > Subject: Re: [PATCH] Drivers: hv: vmbus: Deferring per cpu tasks
> > 
> > Without the patch, I think the current CPU uses IPIs to let the other
> > CPUs, one by one,  run the function calls, and synchronously waits
> > for the function calls to finish.
> > 
> > IMO the patch is not "Deferring per cpu tasks". "Defer" means "let it
> > happen later". Here it schedules work items to different CPUs, and
> > the work items immediately start to run on these CPUs.
> > 
> > I would suggest a more accurate subject:
> > Drivers: hv: vmbus: Run hv_synic_init() concurrently
> > 
> 
> It would be great to call out the "why" as well in the title,
> something like:
> 
> Drivers: hv: vmbus: Speed-up booting by running hv_synic_init() concurrently

Thanks, I can also rephrase it like below if sounds fine to you:

Drivers: hv: vmbus: Optimize boot time by concurrent execution of hv_synic_init()

- Saurabh

> 
> Regards,
> Srivatsa
> Microsoft Linux Systems Group