From: Rik van Riel <riel@redhat.com>
To: Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>,
linux-kernel@vger.kernel.org, aquini@redhat.com,
walken@google.com, eric.dumazet@gmail.com, lwoodman@redhat.com,
knoel@redhat.com, chegu_vinod@hp.com,
raghavendra.kt@linux.vnet.ibm.com, mingo@redhat.com
Subject: Re: [PATCH -v4 5/5] x86,smp: limit spinlock delay on virtual machines
Date: Wed, 06 Feb 2013 12:05:26 -0500 [thread overview]
Message-ID: <51128D56.9080204@redhat.com> (raw)
In-Reply-To: <20130204140203.GB15452@pd.tnic>
On 02/04/2013 09:02 AM, Borislav Petkov wrote:
> On Mon, Feb 04, 2013 at 08:50:33AM -0500, Rik van Riel wrote:
>> We need to know whether we are actually running on top of a
>> hypervisor, not whether we have the code compiled in to do so.
>
> Oh ok, I see.
>
> The thing is, if CONFIG_PARAVIRT_GUEST is disabled, x86_hyper won't
> exist, see: http://marc.info/?l=linux-kernel&m=135936817627848&w=2
>
> So maybe the hypervisor guest should itself take care of this and upon
> init it should set the max_spinlock_delay in init_hypervisor() instead?
> Seems only fair to me...
I ended up making the call from init_hypervisor_platform, which
already does the check for x86_hyper itself, allowing me to not
check x86_hyper at all from smp.c
next prev parent reply other threads:[~2013-02-06 17:06 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-25 19:05 [PATCH -v4 0/5] x86,smp: make ticket spinlock proportional backoff w/ auto tuning Rik van Riel
2013-01-25 19:16 ` [PATCH -v4 1/5] x86,smp: move waiting on contended ticket lock out of line Rik van Riel
2013-01-25 19:17 ` [PATCH -v4 2/5] x86,smp: proportional backoff for ticket spinlocks Rik van Riel
2013-01-25 19:17 ` [PATCH -v4 3/5] x86,smp: auto tune spinlock backoff delay factor Rik van Riel
2013-01-26 12:03 ` Ingo Molnar
2013-01-25 19:18 ` [PATCH -v4 4/5] x86,smp: keep spinlock delay values per hashed spinlock address Rik van Riel
2013-01-27 13:04 ` Michel Lespinasse
2013-02-06 20:10 ` Rik van Riel
2013-02-09 23:50 ` Michel Lespinasse
2013-01-25 19:19 ` [PATCH -v4 5/5] x86,smp: limit spinlock delay on virtual machines Rik van Riel
2013-01-26 12:00 ` Ingo Molnar
2013-01-26 12:47 ` Borislav Petkov
2013-02-04 13:50 ` Rik van Riel
2013-02-04 14:02 ` Borislav Petkov
2013-02-06 17:05 ` Rik van Riel [this message]
2013-01-28 18:18 ` Stefano Stabellini
2013-01-25 19:20 ` [DEBUG PATCH -v4 6/5] x86,smp: add debugging code to track spinlock delay value Rik van Riel
2013-01-26 7:21 ` [PATCH -v4 0/5] x86,smp: make ticket spinlock proportional backoff w/ auto tuning Mike Galbraith
2013-01-26 12:05 ` Ingo Molnar
2013-01-26 13:10 ` Mike Galbraith
2013-01-28 6:49 ` Raghavendra K T
2013-02-03 15:28 ` Chegu Vinod
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