diff options
Diffstat (limited to 'arch/s390/appldata/appldata_os.c')
| -rw-r--r-- | arch/s390/appldata/appldata_os.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/arch/s390/appldata/appldata_os.c b/arch/s390/appldata/appldata_os.c new file mode 100644 index 000000000..433a994b1 --- /dev/null +++ b/arch/s390/appldata/appldata_os.c @@ -0,0 +1,221 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Data gathering module for Linux-VM Monitor Stream, Stage 1. + * Collects misc. OS related data (CPU utilization, running processes). + * + * Copyright IBM Corp. 2003, 2006 + * + * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> + */ + +#define KMSG_COMPONENT "appldata" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/kernel_stat.h> +#include <linux/netdevice.h> +#include <linux/sched.h> +#include <linux/sched/loadavg.h> +#include <linux/sched/stat.h> +#include <asm/appldata.h> +#include <asm/smp.h> + +#include "appldata.h" + + +#define LOAD_INT(x) ((x) >> FSHIFT) +#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100) + +/* + * OS data + * + * This is accessed as binary data by z/VM. If changes to it can't be avoided, + * the structure version (product ID, see appldata_base.c) needs to be changed + * as well and all documentation and z/VM applications using it must be + * updated. + * + * The record layout is documented in the Linux for zSeries Device Drivers + * book: + * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml + */ +struct appldata_os_per_cpu { + u32 per_cpu_user; /* timer ticks spent in user mode */ + u32 per_cpu_nice; /* ... spent with modified priority */ + u32 per_cpu_system; /* ... spent in kernel mode */ + u32 per_cpu_idle; /* ... spent in idle mode */ + + /* New in 2.6 */ + u32 per_cpu_irq; /* ... spent in interrupts */ + u32 per_cpu_softirq; /* ... spent in softirqs */ + u32 per_cpu_iowait; /* ... spent while waiting for I/O */ + + /* New in modification level 01 */ + u32 per_cpu_steal; /* ... stolen by hypervisor */ + u32 cpu_id; /* number of this CPU */ +} __attribute__((packed)); + +struct appldata_os_data { + u64 timestamp; + u32 sync_count_1; /* after VM collected the record data, */ + u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the + same. If not, the record has been updated on + the Linux side while VM was collecting the + (possibly corrupt) data */ + + u32 nr_cpus; /* number of (virtual) CPUs */ + u32 per_cpu_size; /* size of the per-cpu data struct */ + u32 cpu_offset; /* offset of the first per-cpu data struct */ + + u32 nr_running; /* number of runnable threads */ + u32 nr_threads; /* number of threads */ + u32 avenrun[3]; /* average nr. of running processes during */ + /* the last 1, 5 and 15 minutes */ + + /* New in 2.6 */ + u32 nr_iowait; /* number of blocked threads + (waiting for I/O) */ + + /* per cpu data */ + struct appldata_os_per_cpu os_cpu[0]; +} __attribute__((packed)); + +static struct appldata_os_data *appldata_os_data; + +static struct appldata_ops ops = { + .name = "os", + .record_nr = APPLDATA_RECORD_OS_ID, + .owner = THIS_MODULE, + .mod_lvl = {0xF0, 0xF1}, /* EBCDIC "01" */ +}; + + +/* + * appldata_get_os_data() + * + * gather OS data + */ +static void appldata_get_os_data(void *data) +{ + int i, j, rc; + struct appldata_os_data *os_data; + unsigned int new_size; + + os_data = data; + os_data->sync_count_1++; + + os_data->nr_threads = nr_threads; + os_data->nr_running = nr_running(); + os_data->nr_iowait = nr_iowait(); + os_data->avenrun[0] = avenrun[0] + (FIXED_1/200); + os_data->avenrun[1] = avenrun[1] + (FIXED_1/200); + os_data->avenrun[2] = avenrun[2] + (FIXED_1/200); + + j = 0; + for_each_online_cpu(i) { + os_data->os_cpu[j].per_cpu_user = + nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_USER]); + os_data->os_cpu[j].per_cpu_nice = + nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_NICE]); + os_data->os_cpu[j].per_cpu_system = + nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]); + os_data->os_cpu[j].per_cpu_idle = + nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IDLE]); + os_data->os_cpu[j].per_cpu_irq = + nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IRQ]); + os_data->os_cpu[j].per_cpu_softirq = + nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]); + os_data->os_cpu[j].per_cpu_iowait = + nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IOWAIT]); + os_data->os_cpu[j].per_cpu_steal = + nsecs_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_STEAL]); + os_data->os_cpu[j].cpu_id = i; + j++; + } + + os_data->nr_cpus = j; + + new_size = sizeof(struct appldata_os_data) + + (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu)); + if (ops.size != new_size) { + if (ops.active) { + rc = appldata_diag(APPLDATA_RECORD_OS_ID, + APPLDATA_START_INTERVAL_REC, + (unsigned long) ops.data, new_size, + ops.mod_lvl); + if (rc != 0) + pr_err("Starting a new OS data collection " + "failed with rc=%d\n", rc); + + rc = appldata_diag(APPLDATA_RECORD_OS_ID, + APPLDATA_STOP_REC, + (unsigned long) ops.data, ops.size, + ops.mod_lvl); + if (rc != 0) + pr_err("Stopping a faulty OS data " + "collection failed with rc=%d\n", rc); + } + ops.size = new_size; + } + os_data->timestamp = get_tod_clock(); + os_data->sync_count_2++; +} + + +/* + * appldata_os_init() + * + * init data, register ops + */ +static int __init appldata_os_init(void) +{ + int rc, max_size; + + max_size = sizeof(struct appldata_os_data) + + (num_possible_cpus() * sizeof(struct appldata_os_per_cpu)); + if (max_size > APPLDATA_MAX_REC_SIZE) { + pr_err("Maximum OS record size %i exceeds the maximum " + "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE); + rc = -ENOMEM; + goto out; + } + + appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA); + if (appldata_os_data == NULL) { + rc = -ENOMEM; + goto out; + } + + appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu); + appldata_os_data->cpu_offset = offsetof(struct appldata_os_data, + os_cpu); + + ops.data = appldata_os_data; + ops.callback = &appldata_get_os_data; + rc = appldata_register_ops(&ops); + if (rc != 0) + kfree(appldata_os_data); +out: + return rc; +} + +/* + * appldata_os_exit() + * + * unregister ops + */ +static void __exit appldata_os_exit(void) +{ + appldata_unregister_ops(&ops); + kfree(appldata_os_data); +} + + +module_init(appldata_os_init); +module_exit(appldata_os_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Gerald Schaefer"); +MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics"); |