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