From: Andi Kleen <ak@suse.de>
To: David Miller <davem@davemloft.net>
Cc: clameter@sgi.com, akpm@linux-foundation.org, travis@sgi.com,
mathieu.desnoyers@polymtl.ca, linux-kernel@vger.kernel.org
Subject: Re: [rfc 00/45] [RFC] CPU ops and a rework of per cpu data handling on x86_64
Date: Tue, 20 Nov 2007 04:25:34 +0100 [thread overview]
Message-ID: <200711200425.34849.ak@suse.de> (raw)
In-Reply-To: <20071119.175116.55102316.davem@davemloft.net>
> Although we have a per-cpu area base in a fixed global register
> for addressing, the above isn't beneficial on sparc64 because
> the atomic is much slower than doing a:
>
> local_irq_disable();
> nonatomic_percpu_memory_op();
> local_irq_enable();
Again might be pointing out the obvious, but you
need of course save_flags()/restore_flags(), not disable/enable().
If it was just disable/enable x86 could do it much faster too
and Christoph probably would never felt the need to approach
this project for his SLUB fast path.
-Andi
next prev parent reply other threads:[~2007-11-20 3:30 UTC|newest]
Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-20 1:11 [rfc 00/45] [RFC] CPU ops and a rework of per cpu data handling on x86_64 clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 01/45] ACPI: Avoid references to impossible processors clameter, Christoph Lameter
2007-11-20 12:47 ` Mathieu Desnoyers
2007-11-20 20:16 ` Christoph Lameter
2007-11-20 15:29 ` Andi Kleen
2007-11-20 20:18 ` Christoph Lameter
2007-11-20 1:11 ` [rfc 02/45] cpu alloc: Simple version of the allocator (static allocations) clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 03/45] Generic CPU operations: Core piece clameter, Christoph Lameter
2007-11-20 3:17 ` Mathieu Desnoyers
2007-11-20 3:30 ` Christoph Lameter
2007-11-20 4:07 ` Mathieu Desnoyers
2007-11-20 20:36 ` Christoph Lameter
2007-11-20 1:11 ` [rfc 04/45] cpu alloc: Use in SLUB clameter, Christoph Lameter
2007-11-20 12:42 ` Mathieu Desnoyers
2007-11-20 20:44 ` Christoph Lameter
2007-11-20 21:23 ` Mathieu Desnoyers
2007-11-20 21:36 ` Christoph Lameter
2007-11-20 21:43 ` Mathieu Desnoyers
2007-11-20 1:11 ` [rfc 05/45] cpu alloc: Remove SLUB fields clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 06/45] cpu alloc: page allocator conversion clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 07/45] cpu_alloc: Implement dynamically extendable cpu areas clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 08/45] cpu alloc: x86 support clameter, Christoph Lameter
2007-11-20 1:35 ` H. Peter Anvin
2007-11-20 2:02 ` Christoph Lameter
2007-11-20 2:18 ` H. Peter Anvin
2007-11-20 3:37 ` Nick Piggin
2007-11-20 3:59 ` Nick Piggin
2007-11-20 12:05 ` Andi Kleen
2007-11-20 3:16 ` Andi Kleen
2007-11-20 3:50 ` Christoph Lameter
2007-11-20 12:01 ` Andi Kleen
2007-11-20 20:35 ` Christoph Lameter
2007-11-20 20:59 ` Andi Kleen
2007-11-20 21:33 ` Christoph Lameter
2007-11-21 0:10 ` Christoph Lameter
2007-11-21 1:16 ` Christoph Lameter
2007-11-21 1:36 ` Andi Kleen
2007-11-21 2:08 ` Christoph Lameter
2007-11-21 13:08 ` Andi Kleen
2007-11-21 19:01 ` Christoph Lameter
2007-11-20 20:43 ` H. Peter Anvin
2007-11-20 20:51 ` Andi Kleen
2007-11-20 20:58 ` Christoph Lameter
2007-11-20 21:06 ` H. Peter Anvin
2007-11-20 21:34 ` Christoph Lameter
2007-11-20 21:01 ` H. Peter Anvin
2007-11-27 4:12 ` John Richard Moser
2007-11-20 1:11 ` [rfc 09/45] cpu alloc: IA64 support clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 10/45] cpu_alloc: Sparc64 support clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 11/45] cpu alloc: percpu_counter conversion clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 12/45] cpu alloc: crash_notes conversion clameter, Christoph Lameter
2007-11-20 13:03 ` Mathieu Desnoyers
2007-11-20 20:50 ` Christoph Lameter
2007-11-20 1:11 ` [rfc 13/45] cpu alloc: workqueue conversion clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 14/45] cpu alloc: ACPI cstate handling conversion clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 15/45] cpu alloc: genhd statistics conversion clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 16/45] cpu alloc: blktrace conversion clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 17/45] cpu alloc: SRCU clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 18/45] cpu alloc: XFS counters clameter, Christoph Lameter
2007-11-20 8:12 ` Christoph Hellwig
2007-11-20 20:38 ` Christoph Lameter
2007-11-21 4:47 ` David Chinner
2007-11-21 4:50 ` Christoph Lameter
2007-11-20 1:11 ` [rfc 19/45] cpu alloc: NFS statistics clameter, Christoph Lameter
2007-11-20 13:02 ` Mathieu Desnoyers
2007-11-20 20:49 ` Christoph Lameter
2007-11-20 20:56 ` Trond Myklebust
2007-11-20 21:28 ` Mathieu Desnoyers
2007-11-20 21:48 ` Trond Myklebust
2007-11-20 21:50 ` Mathieu Desnoyers
2007-11-20 22:46 ` Trond Myklebust
2007-11-21 0:53 ` Mathieu Desnoyers
2007-11-20 21:26 ` Mathieu Desnoyers
2007-11-20 1:11 ` [rfc 20/45] cpu alloc: neigbour statistics clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 21/45] cpu alloc: tcp statistics clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 22/45] cpu alloc: convert scatches clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 23/45] cpu alloc: dmaengine conversion clameter, Christoph Lameter
2007-11-20 12:50 ` Mathieu Desnoyers
2007-11-20 20:46 ` Christoph Lameter
2007-11-20 1:11 ` [rfc 24/45] cpu alloc: convert loopback statistics clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 25/45] cpu alloc: veth conversion clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 26/45] cpu alloc: Chelsio statistics conversion clameter, Christoph Lameter
2007-11-20 1:11 ` [rfc 27/45] cpu alloc: convert mib handling to cpu alloc clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 28/45] cpu_alloc: convert network sockets clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 29/45] cpu alloc: Use for infiniband clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 30/45] cpu alloc: Use in the crypto subsystem clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 31/45] cpu alloc: Remove the allocpercpu functionality clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 32/45] Module handling: Use CPU_xx ops to dynamically allocate counters clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 33/45] x86_64: Use CPU ops for nmi alert counter clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 34/45] x86_64: Fold percpu area into the cpu area clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 35/45] X86_64: Declare pda as per cpu data thereby moving it " clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 36/45] X86_64: Place pda first in " clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 37/45] x86_64: Support for fast per cpu operations clameter, Christoph Lameter
2007-11-20 2:00 ` H. Peter Anvin
2007-11-20 2:03 ` Christoph Lameter
2007-11-20 2:15 ` H. Peter Anvin
2007-11-20 2:17 ` David Miller
2007-11-20 2:19 ` H. Peter Anvin
2007-11-20 3:23 ` Andi Kleen
2007-11-20 2:45 ` Paul Mackerras
2007-11-20 1:12 ` [rfc 38/45] x86_64: Remove obsolete per_cpu offset calculations clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 39/45] x86_64: Remove the data_offset field from the pda clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 40/45] x86_64: Provide per_cpu_var definition clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 41/45] VM statistics: Use CPU ops clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 43/45] x86_64: Add a CPU_OR to support or_pda() clameter, Christoph Lameter
2007-11-20 1:12 ` [rfc 44/45] Remove local_t support clameter, Christoph Lameter
2007-11-20 12:59 ` Mathieu Desnoyers
2007-11-20 20:48 ` Christoph Lameter
2007-11-20 1:12 ` [rfc 45/45] Modules: Hack to handle symbols that have a zero value clameter, Christoph Lameter
2007-11-20 2:20 ` Mathieu Desnoyers
2007-11-20 2:49 ` Christoph Lameter
2007-11-20 3:29 ` Mathieu Desnoyers
2007-11-20 1:18 ` [rfc 00/45] [RFC] CPU ops and a rework of per cpu data handling on x86_64 Christoph Lameter
2007-11-20 1:51 ` David Miller
2007-11-20 1:59 ` Christoph Lameter
2007-11-20 2:10 ` David Miller
2007-11-20 2:12 ` Christoph Lameter
2007-11-20 3:25 ` Andi Kleen [this message]
2007-11-20 3:33 ` Christoph Lameter
2007-11-20 4:04 ` David Miller
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