Release 4.7 kernel/delayacct.c
/* delayacct.c - per-task delay accounting
*
* Copyright (C) Shailabh Nagar, IBM Corp. 2006
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*/
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/taskstats.h>
#include <linux/time.h>
#include <linux/sysctl.h>
#include <linux/delayacct.h>
#include <linux/module.h>
int delayacct_on __read_mostly = 1;
/* Delay accounting turned on/off */
EXPORT_SYMBOL_GPL(delayacct_on);
struct kmem_cache *delayacct_cache;
static int __init delayacct_setup_disable(char *str)
{
delayacct_on = 0;
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| shailabh nagar | shailabh nagar | 18 | 100.00% | 2 | 100.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
__setup("nodelayacct", delayacct_setup_disable);
void delayacct_init(void)
{
delayacct_cache = KMEM_CACHE(task_delay_info, SLAB_PANIC|SLAB_ACCOUNT);
delayacct_tsk_init(&init_task);
}
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| Person | Tokens | Prop | Commits | CommitProp |
| shailabh nagar | shailabh nagar | 21 | 87.50% | 1 | 33.33% |
| vladimir davydov | vladimir davydov | 2 | 8.33% | 1 | 33.33% |
| christoph lameter | christoph lameter | 1 | 4.17% | 1 | 33.33% |
| Total | 24 | 100.00% | 3 | 100.00% |
void __delayacct_tsk_init(struct task_struct *tsk)
{
tsk->delays = kmem_cache_zalloc(delayacct_cache, GFP_KERNEL);
if (tsk->delays)
spin_lock_init(&tsk->delays->lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| shailabh nagar | shailabh nagar | 36 | 97.30% | 1 | 50.00% |
| christoph lameter | christoph lameter | 1 | 2.70% | 1 | 50.00% |
| Total | 37 | 100.00% | 2 | 100.00% |
/*
* Finish delay accounting for a statistic using its timestamps (@start),
* accumalator (@total) and @count
*/
static void delayacct_end(u64 *start, u64 *total, u32 *count)
{
s64 ns = ktime_get_ns() - *start;
unsigned long flags;
if (ns > 0) {
spin_lock_irqsave(¤t->delays->lock, flags);
*total += ns;
(*count)++;
spin_unlock_irqrestore(¤t->delays->lock, flags);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| shailabh nagar | shailabh nagar | 54 | 72.97% | 1 | 33.33% |
| thomas gleixner | thomas gleixner | 10 | 13.51% | 1 | 33.33% |
| peter zijlstra | peter zijlstra | 10 | 13.51% | 1 | 33.33% |
| Total | 74 | 100.00% | 3 | 100.00% |
void __delayacct_blkio_start(void)
{
current->delays->blkio_start = ktime_get_ns();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| shailabh nagar | shailabh nagar | 13 | 81.25% | 1 | 50.00% |
| thomas gleixner | thomas gleixner | 3 | 18.75% | 1 | 50.00% |
| Total | 16 | 100.00% | 2 | 100.00% |
void __delayacct_blkio_end(void)
{
if (current->delays->flags & DELAYACCT_PF_SWAPIN)
/* Swapin block I/O */
delayacct_end(¤t->delays->blkio_start,
¤t->delays->swapin_delay,
¤t->delays->swapin_count);
else /* Other block I/O */
delayacct_end(¤t->delays->blkio_start,
¤t->delays->blkio_delay,
¤t->delays->blkio_count);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| shailabh nagar | shailabh nagar | 68 | 100.00% | 1 | 100.00% |
| Total | 68 | 100.00% | 1 | 100.00% |
int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
{
cputime_t utime, stime, stimescaled, utimescaled;
unsigned long long t2, t3;
unsigned long flags, t1;
s64 tmp;
task_cputime(tsk, &utime, &stime);
tmp = (s64)d->cpu_run_real_total;
tmp += cputime_to_nsecs(utime + stime);
d->cpu_run_real_total = (tmp < (s64)d->cpu_run_real_total) ? 0 : tmp;
task_cputime_scaled(tsk, &utimescaled, &stimescaled);
tmp = (s64)d->cpu_scaled_run_real_total;
tmp += cputime_to_nsecs(utimescaled + stimescaled);
d->cpu_scaled_run_real_total =
(tmp < (s64)d->cpu_scaled_run_real_total) ? 0 : tmp;
/*
* No locking available for sched_info (and too expensive to add one)
* Mitigate by taking snapshot of values
*/
t1 = tsk->sched_info.pcount;
t2 = tsk->sched_info.run_delay;
t3 = tsk->se.sum_exec_runtime;
d->cpu_count += t1;
tmp = (s64)d->cpu_delay_total + t2;
d->cpu_delay_total = (tmp < (s64)d->cpu_delay_total) ? 0 : tmp;
tmp = (s64)d->cpu_run_virtual_total + t3;
d->cpu_run_virtual_total =
(tmp < (s64)d->cpu_run_virtual_total) ? 0 : tmp;
/* zero XXX_total, non-zero XXX_count implies XXX stat overflowed */
spin_lock_irqsave(&tsk->delays->lock, flags);
tmp = d->blkio_delay_total + tsk->delays->blkio_delay;
d->blkio_delay_total = (tmp < d->blkio_delay_total) ? 0 : tmp;
tmp = d->swapin_delay_total + tsk->delays->swapin_delay;
d->swapin_delay_total = (tmp < d->swapin_delay_total) ? 0 : tmp;
tmp = d->freepages_delay_total + tsk->delays->freepages_delay;
d->freepages_delay_total = (tmp < d->freepages_delay_total) ? 0 : tmp;
d->blkio_count += tsk->delays->blkio_count;
d->swapin_count += tsk->delays->swapin_count;
d->freepages_count += tsk->delays->freepages_count;
spin_unlock_irqrestore(&tsk->delays->lock, flags);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| shailabh nagar | shailabh nagar | 232 | 62.87% | 1 | 11.11% |
| keika kobayashi | keika kobayashi | 38 | 10.30% | 1 | 11.11% |
| thomas gleixner | thomas gleixner | 35 | 9.49% | 1 | 11.11% |
| michael neuling | michael neuling | 27 | 7.32% | 1 | 11.11% |
| frederic weisbecker | frederic weisbecker | 20 | 5.42% | 1 | 11.11% |
| peter zijlstra | peter zijlstra | 9 | 2.44% | 1 | 11.11% |
| balbir singh | balbir singh | 5 | 1.36% | 1 | 11.11% |
| ken chen | ken chen | 2 | 0.54% | 1 | 11.11% |
| ingo molnar | ingo molnar | 1 | 0.27% | 1 | 11.11% |
| Total | 369 | 100.00% | 9 | 100.00% |
__u64 __delayacct_blkio_ticks(struct task_struct *tsk)
{
__u64 ret;
unsigned long flags;
spin_lock_irqsave(&tsk->delays->lock, flags);
ret = nsec_to_clock_t(tsk->delays->blkio_delay +
tsk->delays->swapin_delay);
spin_unlock_irqrestore(&tsk->delays->lock, flags);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| shailabh nagar | shailabh nagar | 51 | 83.61% | 1 | 50.00% |
| peter zijlstra | peter zijlstra | 10 | 16.39% | 1 | 50.00% |
| Total | 61 | 100.00% | 2 | 100.00% |
void __delayacct_freepages_start(void)
{
current->delays->freepages_start = ktime_get_ns();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| keika kobayashi | keika kobayashi | 13 | 81.25% | 1 | 50.00% |
| thomas gleixner | thomas gleixner | 3 | 18.75% | 1 | 50.00% |
| Total | 16 | 100.00% | 2 | 100.00% |
void __delayacct_freepages_end(void)
{
delayacct_end(¤t->delays->freepages_start,
¤t->delays->freepages_delay,
¤t->delays->freepages_count);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| keika kobayashi | keika kobayashi | 31 | 100.00% | 1 | 100.00% |
| Total | 31 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| shailabh nagar | shailabh nagar | 526 | 69.12% | 5 | 23.81% |
| keika kobayashi | keika kobayashi | 82 | 10.78% | 2 | 9.52% |
| thomas gleixner | thomas gleixner | 52 | 6.83% | 2 | 9.52% |
| peter zijlstra | peter zijlstra | 29 | 3.81% | 1 | 4.76% |
| michael neuling | michael neuling | 27 | 3.55% | 1 | 4.76% |
| frederic weisbecker | frederic weisbecker | 20 | 2.63% | 1 | 4.76% |
| glauber costa | glauber costa | 8 | 1.05% | 1 | 4.76% |
| balbir singh | balbir singh | 5 | 0.66% | 1 | 4.76% |
| christoph lameter | christoph lameter | 4 | 0.53% | 3 | 14.29% |
| alexey dobriyan | alexey dobriyan | 3 | 0.39% | 1 | 4.76% |
| vladimir davydov | vladimir davydov | 2 | 0.26% | 1 | 4.76% |
| ken chen | ken chen | 2 | 0.26% | 1 | 4.76% |
| ingo molnar | ingo molnar | 1 | 0.13% | 1 | 4.76% |
| Total | 761 | 100.00% | 21 | 100.00% |
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