From: David Daney <david.daney@cavium.com>
To: Venkatesh Pallipadi <venki@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Suresh Siddha <suresh.b.siddha@intel.com>,
Aaron Durbin <adurbin@google.com>, Paul Turner <pjt@google.com>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC] Extend mwait idle to optimize away IPIs when possible
Date: Mon, 06 Feb 2012 16:26:23 -0800 [thread overview]
Message-ID: <4F306FAF.7020500@cavium.com> (raw)
In-Reply-To: <1328560933-3037-1-git-send-email-venki@google.com>
On 02/06/2012 12:42 PM, Venkatesh Pallipadi wrote:
[...]
> index 5bed94e..6a56cb0 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -170,6 +170,11 @@ config GENERIC_TIME_VSYSCALL
> bool
> default X86_64
>
> +config AVOID_IPI_ON_IDLE
> + bool
> + depends on X86_64
> + default X86_64
> +
Can you get rid of this part...
> config ARCH_HAS_CPU_RELAX
> def_bool y
>
[...]
> diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
> index f50e7fb..340c4e9 100644
> --- a/arch/x86/kernel/acpi/cstate.c
> +++ b/arch/x86/kernel/acpi/cstate.c
> @@ -161,6 +161,14 @@ EXPORT_SYMBOL_GPL(acpi_processor_ffh_cstate_probe);
> */
> void mwait_idle_with_hints(unsigned long ax, unsigned long cx)
> {
> +#ifdef CONFIG_AVOID_IPI_ON_IDLE
... and change all of these to #ifdef CONFIG_64BIT
> + int oldval, cpu = smp_processor_id();
> +
.
.
.
Thanks,
David Daney
next prev parent reply other threads:[~2012-02-07 0:26 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-06 20:42 [RFC] Extend mwait idle to optimize away IPIs when possible Venkatesh Pallipadi
2012-02-06 21:02 ` Peter Zijlstra
2012-02-06 21:26 ` Venki Pallipadi
2012-02-07 0:26 ` David Daney [this message]
2012-02-07 1:24 ` H. Peter Anvin
2012-02-07 1:34 ` David Daney
2012-02-07 1:45 ` H. Peter Anvin
2012-02-07 2:03 ` Venki Pallipadi
2012-02-07 2:24 ` Suresh Siddha
2012-02-07 21:39 ` Venki Pallipadi
2012-02-08 6:51 ` Yong Zhang
2012-02-08 23:28 ` Venki Pallipadi
2012-02-09 2:18 ` Yong Zhang
2012-02-10 2:17 ` Venki Pallipadi
2012-02-13 5:27 ` Yong Zhang
2012-02-10 19:19 ` Peter Zijlstra
2012-02-11 2:11 ` Venki Pallipadi
2012-02-11 3:09 ` Peter Zijlstra
2012-02-13 5:34 ` Yong Zhang
2012-02-14 13:52 ` Peter Zijlstra
2012-02-15 1:39 ` Yong Zhang
2012-02-15 2:32 ` Venki Pallipadi
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