30fd049afc
Currently we don't utilize the sched_switch field anymore. But, simply removing sched_switch field from the middle of the sched_stat output will break tools. So, to stay compatible we hardcode it to zero and remove the field from the scheduler data structures. Update the schedstat documentation accordingly. Signed-off-by: Rakib Mullick <rakib.mullick@gmail.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1327422836.27181.5.camel@localhost.localdomain Signed-off-by: Ingo Molnar <mingo@elte.hu>
112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include "sched.h"
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/*
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* bump this up when changing the output format or the meaning of an existing
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* format, so that tools can adapt (or abort)
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*/
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#define SCHEDSTAT_VERSION 15
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static int show_schedstat(struct seq_file *seq, void *v)
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{
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int cpu;
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int mask_len = DIV_ROUND_UP(NR_CPUS, 32) * 9;
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char *mask_str = kmalloc(mask_len, GFP_KERNEL);
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if (mask_str == NULL)
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return -ENOMEM;
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seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
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seq_printf(seq, "timestamp %lu\n", jiffies);
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for_each_online_cpu(cpu) {
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struct rq *rq = cpu_rq(cpu);
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#ifdef CONFIG_SMP
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struct sched_domain *sd;
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int dcount = 0;
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#endif
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/* runqueue-specific stats */
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seq_printf(seq,
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"cpu%d %u 0 %u %u %u %u %llu %llu %lu",
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cpu, rq->yld_count,
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rq->sched_count, rq->sched_goidle,
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rq->ttwu_count, rq->ttwu_local,
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rq->rq_cpu_time,
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rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
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seq_printf(seq, "\n");
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#ifdef CONFIG_SMP
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/* domain-specific stats */
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rcu_read_lock();
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for_each_domain(cpu, sd) {
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enum cpu_idle_type itype;
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cpumask_scnprintf(mask_str, mask_len,
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sched_domain_span(sd));
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seq_printf(seq, "domain%d %s", dcount++, mask_str);
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for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
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itype++) {
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seq_printf(seq, " %u %u %u %u %u %u %u %u",
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sd->lb_count[itype],
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sd->lb_balanced[itype],
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sd->lb_failed[itype],
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sd->lb_imbalance[itype],
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sd->lb_gained[itype],
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sd->lb_hot_gained[itype],
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sd->lb_nobusyq[itype],
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sd->lb_nobusyg[itype]);
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}
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seq_printf(seq,
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" %u %u %u %u %u %u %u %u %u %u %u %u\n",
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sd->alb_count, sd->alb_failed, sd->alb_pushed,
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sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,
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sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,
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sd->ttwu_wake_remote, sd->ttwu_move_affine,
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sd->ttwu_move_balance);
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}
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rcu_read_unlock();
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#endif
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}
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kfree(mask_str);
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return 0;
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}
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static int schedstat_open(struct inode *inode, struct file *file)
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{
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unsigned int size = PAGE_SIZE * (1 + num_online_cpus() / 32);
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char *buf = kmalloc(size, GFP_KERNEL);
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struct seq_file *m;
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int res;
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if (!buf)
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return -ENOMEM;
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res = single_open(file, show_schedstat, NULL);
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if (!res) {
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m = file->private_data;
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m->buf = buf;
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m->size = size;
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} else
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kfree(buf);
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return res;
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}
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static const struct file_operations proc_schedstat_operations = {
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.open = schedstat_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init proc_schedstat_init(void)
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{
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proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
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return 0;
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}
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module_init(proc_schedstat_init);
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