cregit-Linux how code gets into the kernel

Release 4.15 kernel/tsacct.c

Directory: kernel
/*
 * tsacct.c - System accounting over taskstats interface
 *
 * Copyright (C) Jay Lan,       <jlan@sgi.com>
 *
 *
 * 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 will 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/kernel.h>
#include <linux/sched/signal.h>
#include <linux/sched/mm.h>
#include <linux/sched/cputime.h>
#include <linux/tsacct_kern.h>
#include <linux/acct.h>
#include <linux/jiffies.h>
#include <linux/mm.h>

/*
 * fill in basic accounting fields
 */

void bacct_add_tsk(struct user_namespace *user_ns, struct pid_namespace *pid_ns, struct taskstats *stats, struct task_struct *tsk) { const struct cred *tcred; u64 utime, stime, utimescaled, stimescaled; u64 delta; BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); /* calculate task elapsed time in nsec */ delta = ktime_get_ns() - tsk->start_time; /* Convert to micro seconds */ do_div(delta, NSEC_PER_USEC); stats->ac_etime = delta; /* Convert to seconds for btime */ do_div(delta, USEC_PER_SEC); stats->ac_btime = get_seconds() - delta; if (thread_group_leader(tsk)) { stats->ac_exitcode = tsk->exit_code; if (tsk->flags & PF_FORKNOEXEC) stats->ac_flag |= AFORK; } if (tsk->flags & PF_SUPERPRIV) stats->ac_flag |= ASU; if (tsk->flags & PF_DUMPCORE) stats->ac_flag |= ACORE; if (tsk->flags & PF_SIGNALED) stats->ac_flag |= AXSIG; stats->ac_nice = task_nice(tsk); stats->ac_sched = tsk->policy; stats->ac_pid = task_pid_nr_ns(tsk, pid_ns); rcu_read_lock(); tcred = __task_cred(tsk); stats->ac_uid = from_kuid_munged(user_ns, tcred->uid); stats->ac_gid = from_kgid_munged(user_ns, tcred->gid); stats->ac_ppid = pid_alive(tsk) ? task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0; rcu_read_unlock(); task_cputime(tsk, &utime, &stime); stats->ac_utime = div_u64(utime, NSEC_PER_USEC); stats->ac_stime = div_u64(stime, NSEC_PER_USEC); task_cputime_scaled(tsk, &utimescaled, &stimescaled); stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC); stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC); stats->ac_minflt = tsk->min_flt; stats->ac_majflt = tsk->maj_flt; strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); }

Contributors

PersonTokensPropCommitsCommitProp
Jay Lan20858.76%19.09%
Frédéric Weisbecker4312.15%218.18%
Eric W. Biedermann308.47%19.09%
David Howells257.06%327.27%
Thomas Gleixner185.08%19.09%
Michael Neuling164.52%19.09%
Oleg Nesterov123.39%19.09%
John Stultz20.56%19.09%
Total354100.00%11100.00%

#ifdef CONFIG_TASK_XACCT #define KB 1024 #define MB (1024*KB) #define KB_MASK (~(KB-1)) /* * fill in extended accounting fields */
void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) { struct mm_struct *mm; /* convert pages-nsec/1024 to Mbyte-usec, see __acct_update_integrals */ stats->coremem = p->acct_rss_mem1 * PAGE_SIZE; do_div(stats->coremem, 1000 * KB); stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE; do_div(stats->virtmem, 1000 * KB); mm = get_task_mm(p); if (mm) { /* adjust to KB unit */ stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; mmput(mm); } stats->read_char = p->ioac.rchar & KB_MASK; stats->write_char = p->ioac.wchar & KB_MASK; stats->read_syscalls = p->ioac.syscr & KB_MASK; stats->write_syscalls = p->ioac.syscw & KB_MASK; #ifdef CONFIG_TASK_IO_ACCOUNTING stats->read_bytes = p->ioac.read_bytes & KB_MASK; stats->write_bytes = p->ioac.write_bytes & KB_MASK; stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; #else stats->read_bytes = 0; stats->write_bytes = 0; stats->cancelled_write_bytes = 0; #endif }

Contributors

PersonTokensPropCommitsCommitProp
Jay Lan9443.32%225.00%
Andrew Morton5525.35%112.50%
Rik Van Riel2310.60%112.50%
Oleg Nesterov2310.60%225.00%
Linus Torvalds146.45%112.50%
Andrea Righi83.69%112.50%
Total217100.00%8100.00%

#undef KB #undef MB
static void __acct_update_integrals(struct task_struct *tsk, u64 utime, u64 stime) { u64 time, delta; if (!likely(tsk->mm)) return; time = stime + utime; delta = time - tsk->acct_timexpd; if (delta < TICK_NSEC) return; tsk->acct_timexpd = time; /* * Divide by 1024 to avoid overflow, and to avoid division. * The final unit reported to userspace is Mbyte-usecs, * the rest of the math is done in xacct_add_tsk. */ tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10; tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10; }

Contributors

PersonTokensPropCommitsCommitProp
Jay Lan4651.11%112.50%
Rik Van Riel1921.11%337.50%
Jonathan Lim1415.56%112.50%
Frédéric Weisbecker1011.11%225.00%
Martin Schwidefsky11.11%112.50%
Total90100.00%8100.00%

/** * acct_update_integrals - update mm integral fields in task_struct * @tsk: task_struct for accounting */
void acct_update_integrals(struct task_struct *tsk) { u64 utime, stime; unsigned long flags; local_irq_save(flags); task_cputime(tsk, &utime, &stime); __acct_update_integrals(tsk, utime, stime); local_irq_restore(flags); }

Contributors

PersonTokensPropCommitsCommitProp
Frédéric Weisbecker3571.43%266.67%
Rik Van Riel1428.57%133.33%
Total49100.00%3100.00%

/** * acct_account_cputime - update mm integral after cputime update * @tsk: task_struct for accounting */
void acct_account_cputime(struct task_struct *tsk) { __acct_update_integrals(tsk, tsk->utime, tsk->stime); }

Contributors

PersonTokensPropCommitsCommitProp
Frédéric Weisbecker23100.00%1100.00%
Total23100.00%1100.00%

/** * acct_clear_integrals - clear the mm integral fields in task_struct * @tsk: task_struct whose accounting fields are cleared */
void acct_clear_integrals(struct task_struct *tsk) { tsk->acct_timexpd = 0; tsk->acct_rss_mem1 = 0; tsk->acct_vm_mem1 = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jay Lan2796.43%150.00%
Jonathan Lim13.57%150.00%
Total28100.00%2100.00%

#endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Jay Lan41250.61%414.29%
Frédéric Weisbecker11313.88%27.14%
Rik Van Riel566.88%310.71%
Andrew Morton556.76%13.57%
Oleg Nesterov354.30%310.71%
Eric W. Biedermann303.69%13.57%
David Howells253.07%310.71%
Linus Torvalds182.21%13.57%
Thomas Gleixner182.21%13.57%
Michael Neuling161.97%13.57%
Jonathan Lim151.84%13.57%
Andrea Righi80.98%13.57%
Ingo Molnar70.86%310.71%
Kamezawa Hiroyuki30.37%13.57%
John Stultz20.25%13.57%
Martin Schwidefsky10.12%13.57%
Total814100.00%28100.00%
Directory: kernel
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