From: therbert@google.com (Tom Herbert)
To: davem@davemloft.net, netdev@vger.kernel.org
Subject: RFC [PATCH net-2.6 2/6] net: Changes to x86_64 for softirq scheduling
Date: Wed, 5 Mar 2008 12:51:16 -0800 (PST) [thread overview]
Message-ID: <20080305205116.5B86741278F@localhost> (raw)
This patches includes changes to x86_64 to support scheduling of softirq's between CPUs.
Signed-off-by: Tom Herbert <therbert@google.com>
---
diff -uprN -X /tmp/donts/si_2 net-2.6/arch/x86/kernel/smp_64.c net-2.6.patch/arch/x86/kernel/smp_64.c
--- net-2.6/arch/x86/kernel/smp_64.c 2008-03-05 09:02:22.768649000 -0800
+++ net-2.6.patch/arch/x86/kernel/smp_64.c 2008-03-05 09:25:33.403752000 -0800
@@ -296,6 +296,15 @@ void smp_send_reschedule(int cpu)
}
/*
+ * this function sends a 'reschedule' IPI to multiple
+ * CPUs in the mask.
+ */
+void smp_send_reschedule_mask(cpumask_t mask)
+{
+ send_IPI_mask(mask, RESCHEDULE_VECTOR);
+}
+
+/*
* Structure and data for smp_call_function(). This is designed to minimise
* static memory requirements. It also looks cleaner.
*/
@@ -494,11 +503,20 @@ void smp_send_stop(void)
* Reschedule call back. Nothing to do,
* all the work is done automatically when
* we return from the interrupt.
+ * Reschedule call back. Process rescheduling is done
+ * automatically on return from interrupt. Also, 'or' into
+ * local_softirq_pending any softirq scheduling requests sent
+ * from other CPUs, these softirq's will execute in irq_exit.
*/
asmlinkage void smp_reschedule_interrupt(void)
{
ack_APIC_irq();
+
+ exit_idle();
+ irq_enter();
+ or_alt_softirqs_pending_irqoff();
add_pda(irq_resched_count, 1);
+ irq_exit();
}
asmlinkage void smp_call_function_interrupt(void)
diff -uprN -X /tmp/donts/si_2 net-2.6/include/asm-x86/smp_64.h net-2.6.patch/include/asm-x86/smp_64.h
--- net-2.6/include/asm-x86/smp_64.h 2008-03-05 09:03:19.005115000 -0800
+++ net-2.6.patch/include/asm-x86/smp_64.h 2008-03-05 09:27:32.532262000 -0800
@@ -74,6 +74,9 @@ static inline int num_booting_cpus(void)
}
extern void smp_send_reschedule(int cpu);
+extern void smp_send_reschedule_mask(cpumask_t mask);
+#define ARCH_HAS_SEND_RESCHEDULE_MASK
+
#else /* CONFIG_SMP */
reply other threads:[~2008-03-05 20:51 UTC|newest]
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