From: Torsten Duwe <duwe@lst.de>
To: Scott Wood <scottwood@freescale.com>
Cc: Tom Musta <tommusta@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
Anton Blanchard <anton@samba.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org, Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH] Convert powerpc simple spinlocks into ticket locks
Date: Fri, 7 Feb 2014 10:02:48 +0100 [thread overview]
Message-ID: <20140207090248.GB26811@lst.de> (raw)
In-Reply-To: <1391717992.6733.232.camel@snotra.buserror.net>
On Thu, Feb 06, 2014 at 02:19:52PM -0600, Scott Wood wrote:
> On Thu, 2014-02-06 at 18:37 +0100, Torsten Duwe wrote:
> > On Thu, Feb 06, 2014 at 05:38:37PM +0100, Peter Zijlstra wrote:
>
> > > Can you pair lwarx with sthcx ? I couldn't immediately find the answer
> > > in the PowerISA doc. If so I think you can do better by being able to
> > > atomically load both tickets but only storing the head without affecting
> > > the tail.
Can I simply write the half word, without a reservation, or will the HW caches
mess up the other half? Will it ruin the cache coherency on some (sub)architectures?
> Plus, sthcx doesn't exist on all PPC chips.
Which ones are lacking it? Do all have at least a simple 16-bit store?
Torsten
next prev parent reply other threads:[~2014-02-07 9:02 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-06 10:37 [PATCH] Convert powerpc simple spinlocks into ticket locks Torsten Duwe
2014-02-06 15:53 ` Benjamin Herrenschmidt
2014-02-06 16:38 ` Peter Zijlstra
2014-02-06 17:37 ` Torsten Duwe
2014-02-06 18:08 ` Peter Zijlstra
2014-02-06 19:28 ` Tom Musta
2014-02-10 2:54 ` Benjamin Herrenschmidt
2014-02-07 8:24 ` Torsten Duwe
2014-02-06 20:19 ` Scott Wood
2014-02-07 9:02 ` Torsten Duwe [this message]
2014-02-07 10:31 ` Peter Zijlstra
2014-02-07 10:36 ` Peter Zijlstra
2014-02-07 10:45 ` Peter Zijlstra
2014-02-07 11:49 ` Torsten Duwe
2014-02-07 12:28 ` Peter Zijlstra
2014-02-07 15:18 ` Peter Zijlstra
2014-02-07 15:43 ` Peter Zijlstra
2014-02-07 17:08 ` Torsten Duwe
2014-02-07 17:19 ` Peter Zijlstra
2014-02-07 15:51 ` Kumar Gala
2014-02-07 16:10 ` Peter Zijlstra
2014-02-10 3:05 ` Benjamin Herrenschmidt
2014-02-10 3:02 ` Benjamin Herrenschmidt
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