On Friday 19 December 2008, Stephen Rothwell wrote:
> Hi all,
>
> Changes since 20081218:
Just few very minor issues w.r.t. "x86, sparseirq: move irq_desc according
to smp_affinity, v7" (commit 48a1b10aff588833b73994704c47bbd0deb73e9c):
+config NUMA_MIGRATE_IRQ_DESC
+ bool "Move irq desc when changing irq smp_affinity"
+ depends on SPARSE_IRQ && SMP
+ default n
+ help
+ This enables moving irq_desc to cpu/node that irq will use handled.
+
+ If you don't know what to do here, say N.
This is a bit confusing (at least I was confused since I don't have NUMA
set in my config) -- either it should depend on NUMA or the config option
name should be changed.
@@ -2346,14 +2466,34 @@ static void irq_complete_move(struct irq_desc **descp)
struct irq_cfg *cfg = desc->chip_data;
unsigned vector, me;
- if (likely(!cfg->move_in_progress))
+ if (likely(!cfg->move_in_progress)) {
+#ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
+ if (likely(!cfg->move_desc_pending))
+ return;
+
+ /* domain is not change, but affinity is changed */
this comment sounds weird
perhaps: /* only affinity is changed */ would be better?
+++ b/kernel/irq/numa_migrate.c
@@ -0,0 +1,127 @@
+/*
+ * linux/kernel/irq/handle.c
+ *
+ * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
+ * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
+ *
+ * This file contains the core interrupt handling code.
+ *
+ * Detailed information is available in Documentation/DocBook/genericirq
+ *
+ */
hmmm? ;-)
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