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

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Message-ID: <20141109005124.GG4901@linux.vnet.ibm.com>
Date:	Sat, 8 Nov 2014 16:51:24 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Alexander Monakov <amonakov@...il.com>
Cc:	Konstantin Khlebnikov <koct9i@...il.com>,
	linux-acpi@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-kernel@...r.kernel.org, Len Brown <lenb@...nel.org>,
	Tom Boshoven <tomboshoven@...il.com>, x86@...nel.org,
	Josh Triplett <josh@...htriplett.org>
Subject: Re: [PATCH] ACPI/osl: speedup grace period in acpi_os_map_cleanup

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.

							Thanx, Paul

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