diff mbox

[net-next-2.6,1/3] irq: Export irq_set_affinity() for drivers

Message ID 20091021022626.32449.73883.stgit@localhost.localdomain
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

Kirsher, Jeffrey T Oct. 21, 2009, 2:26 a.m. UTC 
From: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>

This patch allows drivers to specify an IRQ affinity mask for
their respective interrupt sources.  This is very useful on
network adapters using MSI-X, where aligning network flows
linearly to CPUs greatly improves efficiency of the network
stack.

Today, users must either hand-set affinity through /proc, or
use a script through the same interface.  This patch will allow
a driver to come completely pre-canned with an optimal
configuration.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 kernel/irq/manage.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)


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Comments

Ben Hutchings Oct. 21, 2009, 3:35 p.m. UTC | #1 
On Tue, 2009-10-20 at 19:26 -0700, Jeff Kirsher wrote:
> From: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
> 
> This patch allows drivers to specify an IRQ affinity mask for
> their respective interrupt sources.  This is very useful on
> network adapters using MSI-X, where aligning network flows
> linearly to CPUs greatly improves efficiency of the network
> stack.
[...]

Since this is not networking-specific, I think it needs to go to
linux-kernel as well.

Ben.
diff mbox

Patch

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index bde4c66..185eb26 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -137,6 +137,7 @@  int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
 	spin_unlock_irqrestore(&desc->lock, flags);
 	return 0;
 }
+EXPORT_SYMBOL(irq_set_affinity);
 
 #ifndef CONFIG_AUTO_IRQ_AFFINITY
 /*