From: ebiederm@xmission.com (Eric W. Biederman)
To: "Yinghai Lu" <yhlu.kernel@gmail.com>
Cc: "Ingo Molnar" <mingo@elte.hu>,
"Thomas Gleixner" <tglx@linutronix.de>, hpa <hpa@zytor.com>,
"Dhaval Giani" <dhaval@linux.vnet.ibm.com>,
"Mike Travis" <travis@sgi.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 00/16] dyn_array and nr_irqs support v2
Date: Fri, 01 Aug 2008 15:45:23 -0700 [thread overview]
Message-ID: <m1abfwnym4.fsf@frodo.ebiederm.org> (raw)
In-Reply-To: <86802c440808011457g5b72d69bq768cf815046957ec@mail.gmail.com> (Yinghai Lu's message of "Fri, 1 Aug 2008 14:57:13 -0700")
"Yinghai Lu" <yhlu.kernel@gmail.com> writes:
> On Fri, Aug 1, 2008 at 2:30 PM, Yinghai Lu <yhlu.kernel@gmail.com> wrote:
>> On Fri, Aug 1, 2008 at 1:46 PM, Eric W. Biederman <ebiederm@xmission.com>
> wrote:
>
>>> http://lkml.org/lkml/2008/7/10/439
>
> you moved kstat_irqs to irqdesc, and it will not numa-aware. if
> irq_desc is not go with every cpu.
That part is a limitation of the per cpu allocator that the sgi guys
are in the process of fixing. Which is one of the following goals
of folding the pda into a per cpu structure.
In practice it matters little as irqs only occur on one cpu at a time,
so we shouldn't have cache line contention.
I never got to the arch specific part of allocating irq_desc in a numa
aware fashion. But I have always figured that if we move the work to
arch code it won't be too difficult, to do things appropriately.
Eric
next prev parent reply other threads:[~2008-08-01 22:53 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-01 9:37 [PATCH 00/16] dyn_array and nr_irqs support v2 Yinghai Lu
2008-08-01 9:37 ` [PATCH 01/16] x86: 64bit support more than 256 irq Yinghai Lu
2008-08-01 9:37 ` [PATCH 02/16] x86: introduce nr_irqs for 64bit v3 Yinghai Lu
2008-08-01 9:37 ` [PATCH 03/16] add dyn_array support Yinghai Lu
2008-08-01 9:37 ` [PATCH 04/16] make irq_timer_state to use dyn_array Yinghai Lu
2008-08-01 9:37 ` [PATCH 05/16] make irq2_iommu " Yinghai Lu
2008-08-01 9:37 ` [PATCH 06/16] make irq_desc " Yinghai Lu
2008-08-01 9:37 ` [PATCH 07/16] x86: make 64bit support dyn_array Yinghai Lu
2008-08-01 9:37 ` [PATCH 08/16] serial: change remove NR_IRQS in 8250.c v2 Yinghai Lu
2008-08-01 9:37 ` [PATCH 09/16] add per_cpu_dyn_array support Yinghai Lu
2008-08-01 9:37 ` [PATCH 10/16] irq: make irqs in kernel stat use per_cpu_dyn_array Yinghai Lu
2008-08-01 9:37 ` [PATCH 11/16] x86 remove irq_vectors_limit.h Yinghai Lu
2008-08-01 9:37 ` [PATCH 12/16] x86: make 32bit use dyn_array Yinghai Lu
2008-08-01 9:37 ` [PATCH 13/16] add per_cpu_dyn_array for arch percpu support Yinghai Lu
2008-08-01 9:37 ` [PATCH 14/16] x86: get mp_irqs from madt Yinghai Lu
2008-08-01 9:37 ` [PATCH 15/16] x86: make 32bit more like with io_apic/dyn_array to 64 bit Yinghai Lu
2008-08-01 9:37 ` [PATCH 16/16] x86: alloc dyn_array all alltogether Yinghai Lu
2008-08-01 20:46 ` [PATCH 00/16] dyn_array and nr_irqs support v2 Eric W. Biederman
2008-08-01 21:30 ` Yinghai Lu
2008-08-01 21:57 ` Yinghai Lu
2008-08-01 22:45 ` Eric W. Biederman [this message]
2008-08-01 22:10 ` Yinghai Lu
2008-08-01 22:38 ` Eric W. Biederman
2008-08-02 1:09 ` Yinghai Lu
2008-08-02 1:36 ` H. Peter Anvin
2008-08-02 1:41 ` Eric W. Biederman
2008-08-02 2:01 ` Yinghai Lu
2008-08-02 2:03 ` H. Peter Anvin
2008-08-02 2:39 ` Eric W. Biederman
2008-08-02 3:28 ` H. Peter Anvin
2008-08-02 4:42 ` Eric W. Biederman
2008-08-02 15:41 ` H. Peter Anvin
2008-08-02 20:20 ` Eric W. Biederman
2008-08-04 12:57 ` Mike Travis
2008-08-05 2:38 ` H. Peter Anvin
2008-08-05 3:40 ` Eric W. Biederman
2008-08-05 3:48 ` H. Peter Anvin
2008-08-01 21:47 ` Mike Travis
2008-08-02 2:58 ` Yinghai Lu
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