sched: /debug/sched_features
provide a text based interface to the scheduler features; this saves the 'user' from setting bits using decimal arithmetic. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>hifive-unleashed-5.1
Peter Zijlstra
Ingo Molnar
parent
06379aba52
commit
f00b45c145
162
kernel/sched.c
162
kernel/sched.c
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@ -68,6 +68,8 @@
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#include <linux/hrtimer.h>
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#include <linux/tick.h>
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#include <linux/bootmem.h>
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#include <linux/debugfs.h>
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#include <linux/ctype.h>
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#include <asm/tlb.h>
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#include <asm/irq_regs.h>
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@ -732,32 +734,148 @@ static void update_rq_clock(struct rq *rq)
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/*
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* Debugging: various feature bits
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*/
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#define SCHED_FEAT(name, enabled) \
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__SCHED_FEAT_##name ,
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enum {
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SCHED_FEAT_NEW_FAIR_SLEEPERS = 1,
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SCHED_FEAT_WAKEUP_PREEMPT = 2,
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SCHED_FEAT_START_DEBIT = 4,
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SCHED_FEAT_AFFINE_WAKEUPS = 8,
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SCHED_FEAT_CACHE_HOT_BUDDY = 16,
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SCHED_FEAT_SYNC_WAKEUPS = 32,
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SCHED_FEAT_HRTICK = 64,
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SCHED_FEAT_DOUBLE_TICK = 128,
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SCHED_FEAT_NORMALIZED_SLEEPER = 256,
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SCHED_FEAT_DEADLINE = 512,
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#include "sched_features.h"
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};
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const_debug unsigned int sysctl_sched_features =
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SCHED_FEAT_NEW_FAIR_SLEEPERS * 1 |
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SCHED_FEAT_WAKEUP_PREEMPT * 1 |
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SCHED_FEAT_START_DEBIT * 1 |
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SCHED_FEAT_AFFINE_WAKEUPS * 1 |
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SCHED_FEAT_CACHE_HOT_BUDDY * 1 |
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SCHED_FEAT_SYNC_WAKEUPS * 1 |
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SCHED_FEAT_HRTICK * 1 |
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SCHED_FEAT_DOUBLE_TICK * 0 |
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SCHED_FEAT_NORMALIZED_SLEEPER * 1 |
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SCHED_FEAT_DEADLINE * 1;
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#undef SCHED_FEAT
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#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)
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#define SCHED_FEAT(name, enabled) \
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(1UL << __SCHED_FEAT_##name) * enabled |
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const_debug unsigned int sysctl_sched_features =
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#include "sched_features.h"
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0;
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#undef SCHED_FEAT
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#ifdef CONFIG_SCHED_DEBUG
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#define SCHED_FEAT(name, enabled) \
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#name ,
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__read_mostly char *sched_feat_names[] = {
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#include "sched_features.h"
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NULL
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};
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#undef SCHED_FEAT
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int sched_feat_open(struct inode *inode, struct file *filp)
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{
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filp->private_data = inode->i_private;
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return 0;
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}
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static ssize_t
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sched_feat_read(struct file *filp, char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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char *buf;
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int r = 0;
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int len = 0;
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int i;
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for (i = 0; sched_feat_names[i]; i++) {
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len += strlen(sched_feat_names[i]);
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len += 4;
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}
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buf = kmalloc(len + 2, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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for (i = 0; sched_feat_names[i]; i++) {
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if (sysctl_sched_features & (1UL << i))
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r += sprintf(buf + r, "%s ", sched_feat_names[i]);
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else
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r += sprintf(buf + r, "no_%s ", sched_feat_names[i]);
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}
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r += sprintf(buf + r, "\n");
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WARN_ON(r >= len + 2);
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r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
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kfree(buf);
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return r;
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}
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static ssize_t
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sched_feat_write(struct file *filp, const char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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char buf[64];
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char *cmp = buf;
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int neg = 0;
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int i;
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if (cnt > 63)
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cnt = 63;
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if (copy_from_user(&buf, ubuf, cnt))
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return -EFAULT;
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buf[cnt] = 0;
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if (strncmp(buf, "no_", 3) == 0) {
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neg = 1;
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cmp += 3;
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}
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for (i = 0; sched_feat_names[i]; i++) {
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int len = strlen(sched_feat_names[i]);
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if (strncmp(cmp, sched_feat_names[i], len) == 0) {
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if (neg)
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sysctl_sched_features &= ~(1UL << i);
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else
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sysctl_sched_features |= (1UL << i);
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break;
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}
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}
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if (!sched_feat_names[i])
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return -EINVAL;
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filp->f_pos += cnt;
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return cnt;
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}
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static struct file_operations sched_feat_fops = {
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.open = sched_feat_open,
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.read = sched_feat_read,
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.write = sched_feat_write,
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};
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static __init int sched_init_debug(void)
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{
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int i, j, len;
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for (i = 0; sched_feat_names[i]; i++) {
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len = strlen(sched_feat_names[i]);
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for (j = 0; j < len; j++) {
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sched_feat_names[i][j] =
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tolower(sched_feat_names[i][j]);
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}
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}
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debugfs_create_file("sched_features", 0644, NULL, NULL,
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&sched_feat_fops);
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return 0;
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}
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late_initcall(sched_init_debug);
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#endif
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#define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
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/*
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* Number of tasks to iterate in a single balance run.
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@ -0,0 +1,10 @@
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SCHED_FEAT(NEW_FAIR_SLEEPERS, 1)
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SCHED_FEAT(WAKEUP_PREEMPT, 1)
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SCHED_FEAT(START_DEBIT, 1)
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SCHED_FEAT(AFFINE_WAKEUPS, 1)
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SCHED_FEAT(CACHE_HOT_BUDDY, 1)
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SCHED_FEAT(SYNC_WAKEUPS, 1)
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SCHED_FEAT(HRTICK, 1)
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SCHED_FEAT(DOUBLE_TICK, 0)
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SCHED_FEAT(NORMALIZED_SLEEPER, 1)
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SCHED_FEAT(DEADLINE, 1)
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