linux-kernel - Re: [PATCH] ACPI/osl: speedup grace period in acpi_os_map

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Message-ID: <CALYGNiN9-Jf1BYDB-Z_kdeU2ErorUiVT_EMj9K4JFCjjSUU0Qg@mail.gmail.com>
Date:	Sun, 9 Nov 2014 15:04:16 +0400
From:	Konstantin Khlebnikov <koct9i@...il.com>
To:	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Cc:	Alexander Monakov <amonakov@...il.com>, linux-acpi@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Tom Boshoven <tomboshoven@...il.com>,
	"x86@...nel.org" <x86@...nel.org>,
	Josh Triplett <josh@...htriplett.org>
Subject: Re: [PATCH] ACPI/osl: speedup grace period in acpi_os_map_cleanup

On Sun, Nov 9, 2014 at 3:51 AM, Paul E. McKenney
<paulmck@...ux.vnet.ibm.com> wrote:
> On Sun, Nov 09, 2014 at 03:24:34AM +0400, Alexander Monakov wrote:
>> On Sun, Nov 9, 2014 at 1:13 AM, Paul E. McKenney
>> <paulmck@...ux.vnet.ibm.com> wrote:
>> >
>> > Did anyone try replacing the synchronize_rcu() with
>> > synchronize_rcu_expedited()?  That should provide substantial speedups
>> > over synchronize_rcu().
>>
>> I've just briefly tested it on my laptop, and it also helps to avoid the issue.
>
> OK, good.
>
> In the past, synchronize_rcu_expedited() has been a bit unfriendly to
> battery-powered platforms and to real-time and HPC workloads, but
> recent changes for the most part fix this.

Good. In this way patch is much smaller.
This code shouldn't be used too frequently, so overhead isn't so much
important here.

>
>                                                         Thanx, Paul
>
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