linux-kernel - Re: [PATCH] x86: make generic arch support NUMAQ v2

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Date:	Thu, 5 Jun 2008 23:27:02 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Sam Ravnborg" <sam@...nborg.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: make generic arch support NUMAQ v2

On Thu, Jun 5, 2008 at 11:17 PM, Sam Ravnborg <sam@...nborg.org> wrote:
> On Thu, Jun 05, 2008 at 05:54:40PM -0700, Yinghai Lu wrote:
>> On Thu, Jun 5, 2008 at 5:14 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
>> >
>> > so it could fallback to normal numa.
>> >
>> > NUMAQ depends on GENERICARCH
>> >
>> > also decouple genericarch numa with acpi.
>> >
>> > Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
>> >
>> > Index: linux-2.6/arch/x86/Kconfig
>> > ===================================================================
>> > --- linux-2.6.orig/arch/x86/Kconfig
>> > +++ linux-2.6/arch/x86/Kconfig
>> > @@ -264,17 +264,6 @@ config X86_VOYAGER
>> >          If you do not specifically know you have a Voyager based machine,
>> >          say N here, otherwise the kernel you build will not be bootable.
>> >
>> > -config X86_NUMAQ
>> > -       bool "NUMAQ (IBM/Sequent)"
>> > -       depends on SMP && X86_32 && PCI
>> > -       select NUMA
>> > -       help
>> > -         This option is used for getting Linux to run on a (IBM/Sequent) NUMA
>> > -         multiquad box. This changes the way that processors are bootstrapped,
>> > -         and uses Clustered Logical APIC addressing mode instead of Flat Logical.
>> > -         You will need a new lynxer.elf file to flash your firmware with - send
>> > -         email to <Martin.Bligh@...ibm.com>.
>> > -
>> >  config X86_SUMMIT
>> >        bool "Summit/EXA (IBM x440)"
>> >        depends on X86_32 && SMP
>> > @@ -307,12 +296,12 @@ config X86_VISWS
>> >          and vice versa. See <file:Documentation/sgi-visws.txt> for details.
>> >
>> >  config X86_GENERICARCH
>> > -       bool "Generic architecture (Summit, bigsmp, ES7000, default)"
>> > +       bool "Generic architecture (NUMAQ, Summit, bigsmp, ES7000, default)"
>> >        depends on X86_32
>> >        help
>> > -          This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
>> > -         It is intended for a generic binary kernel.
>> > -         If you want a NUMA kernel, select ACPI.   We need SRAT for NUMA.
>> > +          This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
>> > +         subarchitectures.  It is intended for a generic binary kernel.
>> > +         You need enable NUMA, otherwise NUMAQ is skipped.
>> >
>> >  config X86_ES7000
>> >        bool "Support for Unisys ES7000 IA32 series"
>> > @@ -348,6 +337,17 @@ config X86_VSMP
>> >
>> >  endchoice
>> >
>> > +config X86_NUMAQ
>> > +       bool "NUMAQ (IBM/Sequent)"
>> > +       depends on SMP && X86_32 && PCI && X86_GENERICARCH
>> > +       select NUMA
>> > +       help
>> > +         This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
>> > +         NUMA multiquad box. This changes the way that processors are
>> > +         bootstrapped, and uses Clustered Logical APIC addressing mode instead
>> > +         of Flat Logical.  You will need a new lynxer.elf file to flash your
>> > +         firmware with - send email to <Martin.Bligh@...ibm.com>.
>> > +
>> >  config SCHED_NO_NO_OMIT_FRAME_POINTER
>> >        def_bool y
>> >        prompt "Single-depth WCHAN output"
>> > @@ -908,9 +908,9 @@ config X86_PAE
>> >  config NUMA
>> >        bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
>> >        depends on SMP
>> > -       depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL)
>> > +       depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_GENERICARCH || X86_SUMMIT && ACPI) && EXPERIMENTAL)
>> >        default n if X86_PC
>> > -       default y if (X86_NUMAQ || X86_SUMMIT)
>> > +       default y if (X86_NUMAQ || X86_SUMMIT || X86_GENERICARCH)
>> >        help
>> >          Enable NUMA (Non Uniform Memory Access) support.
>> >          The kernel will try to allocate memory used by a CPU on the
>>
>> Sam,
>>
>> now NUMAQ depends on GENERICARCH.
>>
>> and Ingo want to make oldconfig to migration NUMAQ....to select GENERICARCH...
>>
>> but if i add select X86_GENERICARCH, make oldconfig will get
>
> It is my understanding that special support for NUMAQ should die,
> so the only remaning usage of CONFIG_NUMAQ is if set to select GENERICARCH.
> In other words that you should not use CONFIG_NUMAQ anywhere in the code
> but solely rely on GENERICARCH and then do runtime detection of the
> other things.

in case someone don't want to build that special numaq code in.

I think we should make ES7000, Summit depend to GENERICARCH too.

YH
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