cregit-Linux how code gets into the kernel

Release 4.15 kernel/delayacct.c

Directory: kernel
/* 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/sched/task.h>
#include <linux/sched/cputime.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

PersonTokensPropCommitsCommitProp
Shailabh Nagar18100.00%2100.00%
Total18100.00%2100.00%

__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); }

Contributors

PersonTokensPropCommitsCommitProp
Shailabh Nagar2187.50%133.33%
Vladimir Davydov28.33%133.33%
Christoph Lameter14.17%133.33%
Total24100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
Shailabh Nagar3697.30%150.00%
Christoph Lameter12.70%150.00%
Total37100.00%2100.00%

/* * Finish delay accounting for a statistic using its timestamps (@start), * accumalator (@total) and @count */
static void delayacct_end(spinlock_t *lock, u64 *start, u64 *total, u32 *count) { s64 ns = ktime_get_ns() - *start; unsigned long flags; if (ns > 0) { spin_lock_irqsave(lock, flags); *total += ns; (*count)++; spin_unlock_irqrestore(lock, flags); } }

Contributors

PersonTokensPropCommitsCommitProp
Shailabh Nagar4464.71%125.00%
Thomas Gleixner1014.71%125.00%
Peter Zijlstra1014.71%125.00%
Josh Snyder45.88%125.00%
Total68100.00%4100.00%


void __delayacct_blkio_start(void) { current->delays->blkio_start = ktime_get_ns(); }

Contributors

PersonTokensPropCommitsCommitProp
Shailabh Nagar1381.25%150.00%
Thomas Gleixner318.75%150.00%
Total16100.00%2100.00%

/* * We cannot rely on the `current` macro, as we haven't yet switched back to * the process being woken. */
void __delayacct_blkio_end(struct task_struct *p) { struct task_delay_info *delays = p->delays; u64 *total; u32 *count; if (p->delays->flags & DELAYACCT_PF_SWAPIN) { total = &delays->swapin_delay; count = &delays->swapin_count; } else { total = &delays->blkio_delay; count = &delays->blkio_count; } delayacct_end(&delays->lock, &delays->blkio_start, total, count); }

Contributors

PersonTokensPropCommitsCommitProp
Josh Snyder4956.32%150.00%
Shailabh Nagar3843.68%150.00%
Total87100.00%2100.00%


int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk) { u64 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 += 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 += 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

PersonTokensPropCommitsCommitProp
Shailabh Nagar23063.36%110.00%
Keika Kobayashi3810.47%110.00%
Thomas Gleixner328.82%110.00%
Michael Neuling256.89%110.00%
Frédéric Weisbecker215.79%220.00%
Peter Zijlstra92.48%110.00%
Balbir Singh51.38%110.00%
Ken Chen20.55%110.00%
Ingo Molnar10.28%110.00%
Total363100.00%10100.00%


__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

PersonTokensPropCommitsCommitProp
Shailabh Nagar5183.61%150.00%
Peter Zijlstra1016.39%150.00%
Total61100.00%2100.00%


void __delayacct_freepages_start(void) { current->delays->freepages_start = ktime_get_ns(); }

Contributors

PersonTokensPropCommitsCommitProp
Keika Kobayashi1381.25%150.00%
Thomas Gleixner318.75%150.00%
Total16100.00%2100.00%


void __delayacct_freepages_end(void) { delayacct_end( &current->delays->lock, &current->delays->freepages_start, &current->delays->freepages_delay, &current->delays->freepages_count); }

Contributors

PersonTokensPropCommitsCommitProp
Keika Kobayashi3181.58%150.00%
Josh Snyder718.42%150.00%
Total38100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Shailabh Nagar48461.89%520.00%
Keika Kobayashi8210.49%28.00%
Josh Snyder617.80%14.00%
Thomas Gleixner496.27%28.00%
Peter Zijlstra293.71%14.00%
Michael Neuling253.20%14.00%
Frédéric Weisbecker212.69%28.00%
Glauber de Oliveira Costa81.02%14.00%
Ingo Molnar70.90%312.00%
Balbir Singh50.64%14.00%
Christoph Lameter40.51%312.00%
Alexey Dobriyan30.38%14.00%
Ken Chen20.26%14.00%
Vladimir Davydov20.26%14.00%
Total782100.00%25100.00%
Directory: kernel
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.