[PATCH 0/3] powerpc: Instrument Hypervisor Calls: add sysfs files
From: Mike Kravetz <hidden>
Date: 2006-06-14 05:07:07
Make statistics available via files in sysfs. -- Signed-off-by: Mike Kravetz <redacted> diff -Naupr linux-2.6.17-rc6/arch/powerpc/kernel/sysfs.c linux-2.6.17-rc6.work/arch/powerpc/kernel/sysfs.c
--- linux-2.6.17-rc6/arch/powerpc/kernel/sysfs.c 2006-06-06 00:57:02.000000000 +0000
+++ linux-2.6.17-rc6.work/arch/powerpc/kernel/sysfs.c 2006-06-13 21:42:32.000000000 +0000@@ -356,6 +356,39 @@ static ssize_t show_physical_id(struct s } static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL); +#ifdef CONFIG_HCALL_STATS +DECLARE_PER_CPU(struct hcall_stats[MAX_HCALL_OPCODES+1], hcall_stats); + +static ssize_t show_hcall_stats(struct sys_device *dev, char *buf) +{ + struct cpu *cpu = container_of(dev, struct cpu, sysdev); + struct hcall_stats *hs = per_cpu(hcall_stats, cpu->sysdev.id); + size_t rc = 0; + size_t b_written = 0; + size_t b_remain = PAGE_SIZE; + unsigned long i; + + for (i=0; i<MAX_HCALL_OPCODES+1; i++){ + if (!hs[i].num_calls) + continue; + + b_written = snprintf(buf+rc, b_remain, + "%lu %lu %lu\n", + i<<2, hs[i].num_calls, hs[i].total_time); + + if (b_written >= b_remain) + break; /* end of buffer */ + + rc += b_written; + b_remain -= b_written; + } + + return rc; +} + +static SYSDEV_ATTR(hcall_stats, 0666, show_hcall_stats, NULL); +#endif /* CONFIG_HCALL_STATS */ + static int __init topology_init(void) { int cpu;
@@ -390,6 +423,9 @@ static int __init topology_init(void) register_cpu(c, cpu, parent); sysdev_create_file(&c->sysdev, &attr_physical_id); +#ifdef CONFIG_HCALL_STATS + sysdev_create_file(&c->sysdev, &attr_hcall_stats); +#endif } if (cpu_online(cpu))