diff options
| author | Anton Blanchard <anton@samba.org> | 2010-01-31 20:30:23 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-02-17 14:02:48 +1100 |
| commit | 8c007bfdf1bab536f824d91fccc76596c18aba78 (patch) | |
| tree | 07bd7c2ce8b016d0d48bd2eb919f0d10eacdf4c5 | |
| parent | 8d3d50bf1913561ef3b1f5b53115c5a481ba9b1e (diff) | |
powerpc: Reduce footprint of irq_stat
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>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| -rw-r--r-- | arch/powerpc/include/asm/hardirq.h | 23 | ||||
| -rw-r--r-- | arch/powerpc/kernel/irq.c | 3 |
2 files changed, 25 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/hardirq.h b/arch/powerpc/include/asm/hardirq.h index fb3c05a0cbbf..9bf3467581b1 100644 --- a/arch/powerpc/include/asm/hardirq.h +++ b/arch/powerpc/include/asm/hardirq.h @@ -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 */ diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index 9040330b0530..c6ac5583672a 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -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; |