From: Anton Blanchard <anton@samba.org>
To: benh@kernel.crashing.org
Cc: linuxppc-dev@ozlabs.org
Subject: [PATCH] powerpc: Reduce footprint of irq_stat
Date: Tue, 12 Jan 2010 21:56:42 +1100 [thread overview]
Message-ID: <20100112105642.GI12666@kryten> (raw)
PowerPC is currently using asm-generic/hardirq.h which statically allocates an
NR_CPUS irq_stat array. Switch to an arch specific implementation which uses
per cpu data:
On a kernel with NR_CPUS=1024, this saves quite a lot of memory:
text data bss dec hex filename
8767938 2944132 1636796 13348866 cbb002 vmlinux.baseline
8767779 2944260 1505724 13217763 c9afe3 vmlinux.irq_cpustat
A saving of around 128kB.
Signed-off-by: Anton Blanchard <anton@samba.org>
---
Index: linux-cpumask/arch/powerpc/include/asm/hardirq.h
===================================================================
--- linux-cpumask.orig/arch/powerpc/include/asm/hardirq.h 2010-01-06 16:24:31.220084536 +1100
+++ linux-cpumask/arch/powerpc/include/asm/hardirq.h 2010-01-06 17:45:25.219563704 +1100
@@ -1 +1,22 @@
-#include <asm-generic/hardirq.h>
+#ifndef _ASM_POWERPC_HARDIRQ_H
+#define _ASM_POWERPC_HARDIRQ_H
+
+#include <linux/threads.h>
+#include <linux/irq.h>
+
+typedef struct {
+ unsigned int __softirq_pending;
+} ____cacheline_aligned irq_cpustat_t;
+
+DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
+
+#define __ARCH_IRQ_STAT
+
+#define local_softirq_pending() __get_cpu_var(irq_stat).__softirq_pending
+
+static inline void ack_bad_irq(unsigned int irq)
+{
+ printk(KERN_CRIT "unexpected IRQ trap at vector %02x\n", irq);
+}
+
+#endif /* _ASM_POWERPC_HARDIRQ_H */
Index: linux-cpumask/arch/powerpc/kernel/irq.c
===================================================================
--- linux-cpumask.orig/arch/powerpc/kernel/irq.c 2010-01-06 16:29:31.370083802 +1100
+++ linux-cpumask/arch/powerpc/kernel/irq.c 2010-01-06 16:48:04.210086075 +1100
@@ -73,6 +73,9 @@
#define CREATE_TRACE_POINTS
#include <asm/trace.h>
+DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
+EXPORT_PER_CPU_SYMBOL(irq_stat);
+
int __irq_offset_value;
static int ppc_spurious_interrupts;
next reply other threads:[~2010-01-12 10:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-12 10:56 Anton Blanchard [this message]
2010-01-12 10:58 ` [PATCH] powerpc: Reduce footprint of xics_ipi_struct Anton Blanchard
2010-02-01 5:18 ` Benjamin Herrenschmidt
2010-02-01 6:26 ` Anton Blanchard
2010-02-01 5:21 ` [PATCH] powerpc: Reduce footprint of irq_stat Benjamin Herrenschmidt
2010-02-01 5:44 ` Anton Blanchard
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