mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-10-31 16:54:21 +00:00
1751f872cc
Add the const qualifier to all the ctl_tables in the tree except for
watchdog_hardlockup_sysctl, memory_allocation_profiling_sysctls,
loadpin_sysctl_table and the ones calling register_net_sysctl (./net,
drivers/inifiniband dirs). These are special cases as they use a
registration function with a non-const qualified ctl_table argument or
modify the arrays before passing them on to the registration function.
Constifying ctl_table structs will prevent the modification of
proc_handler function pointers as the arrays would reside in .rodata.
This is made possible after commit 78eb4ea25c ("sysctl: treewide:
constify the ctl_table argument of proc_handlers") constified all the
proc_handlers.
Created this by running an spatch followed by a sed command:
Spatch:
virtual patch
@
depends on !(file in "net")
disable optional_qualifier
@
identifier table_name != {
watchdog_hardlockup_sysctl,
iwcm_ctl_table,
ucma_ctl_table,
memory_allocation_profiling_sysctls,
loadpin_sysctl_table
};
@@
+ const
struct ctl_table table_name [] = { ... };
sed:
sed --in-place \
-e "s/struct ctl_table .table = &uts_kern/const struct ctl_table *table = \&uts_kern/" \
kernel/utsname_sysctl.c
Reviewed-by: Song Liu <song@kernel.org>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> # for kernel/trace/
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> # SCSI
Reviewed-by: Darrick J. Wong <djwong@kernel.org> # xfs
Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Corey Minyard <cminyard@mvista.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
Acked-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Acked-by: Anna Schumaker <anna.schumaker@oracle.com>
Signed-off-by: Joel Granados <joel.granados@kernel.org>
324 lines
9.1 KiB
C
324 lines
9.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* delayacct.c - per-task delay accounting
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*
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* Copyright (C) Shailabh Nagar, IBM Corp. 2006
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*/
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#include <linux/sched.h>
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#include <linux/sched/task.h>
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#include <linux/sched/cputime.h>
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#include <linux/sched/clock.h>
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#include <linux/slab.h>
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#include <linux/taskstats.h>
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#include <linux/sysctl.h>
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#include <linux/delayacct.h>
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#include <linux/module.h>
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DEFINE_STATIC_KEY_FALSE(delayacct_key);
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int delayacct_on __read_mostly; /* Delay accounting turned on/off */
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struct kmem_cache *delayacct_cache;
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static void set_delayacct(bool enabled)
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{
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if (enabled) {
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static_branch_enable(&delayacct_key);
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delayacct_on = 1;
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} else {
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delayacct_on = 0;
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static_branch_disable(&delayacct_key);
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}
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}
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static int __init delayacct_setup_enable(char *str)
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{
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delayacct_on = 1;
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return 1;
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}
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__setup("delayacct", delayacct_setup_enable);
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void delayacct_init(void)
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{
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delayacct_cache = KMEM_CACHE(task_delay_info, SLAB_PANIC|SLAB_ACCOUNT);
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delayacct_tsk_init(&init_task);
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set_delayacct(delayacct_on);
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}
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#ifdef CONFIG_PROC_SYSCTL
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static int sysctl_delayacct(const struct ctl_table *table, int write, void *buffer,
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size_t *lenp, loff_t *ppos)
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{
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int state = delayacct_on;
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struct ctl_table t;
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int err;
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if (write && !capable(CAP_SYS_ADMIN))
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return -EPERM;
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t = *table;
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t.data = &state;
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err = proc_dointvec_minmax(&t, write, buffer, lenp, ppos);
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if (err < 0)
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return err;
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if (write)
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set_delayacct(state);
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return err;
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}
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static const struct ctl_table kern_delayacct_table[] = {
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{
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.procname = "task_delayacct",
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.data = NULL,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = sysctl_delayacct,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_ONE,
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},
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};
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static __init int kernel_delayacct_sysctls_init(void)
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{
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register_sysctl_init("kernel", kern_delayacct_table);
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return 0;
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}
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late_initcall(kernel_delayacct_sysctls_init);
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#endif
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void __delayacct_tsk_init(struct task_struct *tsk)
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{
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tsk->delays = kmem_cache_zalloc(delayacct_cache, GFP_KERNEL);
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if (tsk->delays)
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raw_spin_lock_init(&tsk->delays->lock);
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}
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/*
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* Finish delay accounting for a statistic using its timestamps (@start),
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* accumulator (@total) and @count
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*/
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static void delayacct_end(raw_spinlock_t *lock, u64 *start, u64 *total, u32 *count, u64 *max, u64 *min)
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{
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s64 ns = local_clock() - *start;
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unsigned long flags;
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if (ns > 0) {
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raw_spin_lock_irqsave(lock, flags);
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*total += ns;
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(*count)++;
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if (ns > *max)
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*max = ns;
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if (*min == 0 || ns < *min)
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*min = ns;
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raw_spin_unlock_irqrestore(lock, flags);
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}
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}
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void __delayacct_blkio_start(void)
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{
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current->delays->blkio_start = local_clock();
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}
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/*
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* We cannot rely on the `current` macro, as we haven't yet switched back to
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* the process being woken.
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*/
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void __delayacct_blkio_end(struct task_struct *p)
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{
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delayacct_end(&p->delays->lock,
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&p->delays->blkio_start,
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&p->delays->blkio_delay,
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&p->delays->blkio_count,
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&p->delays->blkio_delay_max,
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&p->delays->blkio_delay_min);
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}
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int delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
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{
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u64 utime, stime, stimescaled, utimescaled;
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unsigned long long t2, t3;
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unsigned long flags, t1;
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s64 tmp;
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task_cputime(tsk, &utime, &stime);
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tmp = (s64)d->cpu_run_real_total;
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tmp += utime + stime;
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d->cpu_run_real_total = (tmp < (s64)d->cpu_run_real_total) ? 0 : tmp;
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task_cputime_scaled(tsk, &utimescaled, &stimescaled);
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tmp = (s64)d->cpu_scaled_run_real_total;
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tmp += utimescaled + stimescaled;
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d->cpu_scaled_run_real_total =
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(tmp < (s64)d->cpu_scaled_run_real_total) ? 0 : tmp;
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/*
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* No locking available for sched_info (and too expensive to add one)
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* Mitigate by taking snapshot of values
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*/
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t1 = tsk->sched_info.pcount;
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t2 = tsk->sched_info.run_delay;
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t3 = tsk->se.sum_exec_runtime;
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d->cpu_count += t1;
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d->cpu_delay_max = tsk->sched_info.max_run_delay;
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d->cpu_delay_min = tsk->sched_info.min_run_delay;
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tmp = (s64)d->cpu_delay_total + t2;
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d->cpu_delay_total = (tmp < (s64)d->cpu_delay_total) ? 0 : tmp;
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tmp = (s64)d->cpu_run_virtual_total + t3;
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d->cpu_run_virtual_total =
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(tmp < (s64)d->cpu_run_virtual_total) ? 0 : tmp;
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if (!tsk->delays)
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return 0;
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/* zero XXX_total, non-zero XXX_count implies XXX stat overflowed */
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raw_spin_lock_irqsave(&tsk->delays->lock, flags);
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d->blkio_delay_max = tsk->delays->blkio_delay_max;
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d->blkio_delay_min = tsk->delays->blkio_delay_min;
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tmp = d->blkio_delay_total + tsk->delays->blkio_delay;
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d->blkio_delay_total = (tmp < d->blkio_delay_total) ? 0 : tmp;
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d->swapin_delay_max = tsk->delays->swapin_delay_max;
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d->swapin_delay_min = tsk->delays->swapin_delay_min;
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tmp = d->swapin_delay_total + tsk->delays->swapin_delay;
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d->swapin_delay_total = (tmp < d->swapin_delay_total) ? 0 : tmp;
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d->freepages_delay_max = tsk->delays->freepages_delay_max;
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d->freepages_delay_min = tsk->delays->freepages_delay_min;
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tmp = d->freepages_delay_total + tsk->delays->freepages_delay;
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d->freepages_delay_total = (tmp < d->freepages_delay_total) ? 0 : tmp;
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d->thrashing_delay_max = tsk->delays->thrashing_delay_max;
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d->thrashing_delay_min = tsk->delays->thrashing_delay_min;
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tmp = d->thrashing_delay_total + tsk->delays->thrashing_delay;
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d->thrashing_delay_total = (tmp < d->thrashing_delay_total) ? 0 : tmp;
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d->compact_delay_max = tsk->delays->compact_delay_max;
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d->compact_delay_min = tsk->delays->compact_delay_min;
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tmp = d->compact_delay_total + tsk->delays->compact_delay;
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d->compact_delay_total = (tmp < d->compact_delay_total) ? 0 : tmp;
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d->wpcopy_delay_max = tsk->delays->wpcopy_delay_max;
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d->wpcopy_delay_min = tsk->delays->wpcopy_delay_min;
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tmp = d->wpcopy_delay_total + tsk->delays->wpcopy_delay;
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d->wpcopy_delay_total = (tmp < d->wpcopy_delay_total) ? 0 : tmp;
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d->irq_delay_max = tsk->delays->irq_delay_max;
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d->irq_delay_min = tsk->delays->irq_delay_min;
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tmp = d->irq_delay_total + tsk->delays->irq_delay;
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d->irq_delay_total = (tmp < d->irq_delay_total) ? 0 : tmp;
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d->blkio_count += tsk->delays->blkio_count;
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d->swapin_count += tsk->delays->swapin_count;
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d->freepages_count += tsk->delays->freepages_count;
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d->thrashing_count += tsk->delays->thrashing_count;
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d->compact_count += tsk->delays->compact_count;
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d->wpcopy_count += tsk->delays->wpcopy_count;
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d->irq_count += tsk->delays->irq_count;
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raw_spin_unlock_irqrestore(&tsk->delays->lock, flags);
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return 0;
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}
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__u64 __delayacct_blkio_ticks(struct task_struct *tsk)
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{
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__u64 ret;
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unsigned long flags;
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raw_spin_lock_irqsave(&tsk->delays->lock, flags);
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ret = nsec_to_clock_t(tsk->delays->blkio_delay);
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raw_spin_unlock_irqrestore(&tsk->delays->lock, flags);
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return ret;
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}
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void __delayacct_freepages_start(void)
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{
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current->delays->freepages_start = local_clock();
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}
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void __delayacct_freepages_end(void)
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{
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delayacct_end(¤t->delays->lock,
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¤t->delays->freepages_start,
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¤t->delays->freepages_delay,
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¤t->delays->freepages_count,
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¤t->delays->freepages_delay_max,
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¤t->delays->freepages_delay_min);
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}
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void __delayacct_thrashing_start(bool *in_thrashing)
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{
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*in_thrashing = !!current->in_thrashing;
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if (*in_thrashing)
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return;
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current->in_thrashing = 1;
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current->delays->thrashing_start = local_clock();
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}
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void __delayacct_thrashing_end(bool *in_thrashing)
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{
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if (*in_thrashing)
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return;
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current->in_thrashing = 0;
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delayacct_end(¤t->delays->lock,
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¤t->delays->thrashing_start,
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¤t->delays->thrashing_delay,
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¤t->delays->thrashing_count,
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¤t->delays->thrashing_delay_max,
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¤t->delays->thrashing_delay_min);
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}
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void __delayacct_swapin_start(void)
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{
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current->delays->swapin_start = local_clock();
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}
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void __delayacct_swapin_end(void)
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{
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delayacct_end(¤t->delays->lock,
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¤t->delays->swapin_start,
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¤t->delays->swapin_delay,
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¤t->delays->swapin_count,
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¤t->delays->swapin_delay_max,
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¤t->delays->swapin_delay_min);
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}
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void __delayacct_compact_start(void)
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{
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current->delays->compact_start = local_clock();
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}
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void __delayacct_compact_end(void)
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{
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delayacct_end(¤t->delays->lock,
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¤t->delays->compact_start,
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¤t->delays->compact_delay,
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¤t->delays->compact_count,
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¤t->delays->compact_delay_max,
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¤t->delays->compact_delay_min);
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}
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void __delayacct_wpcopy_start(void)
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{
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current->delays->wpcopy_start = local_clock();
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}
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void __delayacct_wpcopy_end(void)
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{
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delayacct_end(¤t->delays->lock,
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¤t->delays->wpcopy_start,
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¤t->delays->wpcopy_delay,
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¤t->delays->wpcopy_count,
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¤t->delays->wpcopy_delay_max,
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¤t->delays->wpcopy_delay_min);
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}
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void __delayacct_irq(struct task_struct *task, u32 delta)
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{
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unsigned long flags;
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raw_spin_lock_irqsave(&task->delays->lock, flags);
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task->delays->irq_delay += delta;
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task->delays->irq_count++;
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if (delta > task->delays->irq_delay_max)
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task->delays->irq_delay_max = delta;
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if (delta && (!task->delays->irq_delay_min || delta < task->delays->irq_delay_min))
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task->delays->irq_delay_min = delta;
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raw_spin_unlock_irqrestore(&task->delays->lock, flags);
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}
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