2006-10-01 00:28:55 -06:00
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/*
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* tsacct.c - System accounting over taskstats interface
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*
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* Copyright (C) Jay Lan, <jlan@sgi.com>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/tsacct_kern.h>
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#include <linux/acct.h>
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2006-10-01 00:29:00 -06:00
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#include <linux/jiffies.h>
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2010-03-05 14:41:39 -07:00
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#include <linux/mm.h>
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2006-10-01 00:28:55 -06:00
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/*
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* fill in basic accounting fields
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*/
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2012-02-07 18:56:49 -07:00
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void bacct_add_tsk(struct user_namespace *user_ns,
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struct pid_namespace *pid_ns,
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struct taskstats *stats, struct task_struct *tsk)
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2006-10-01 00:28:55 -06:00
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{
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2008-11-13 16:39:19 -07:00
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const struct cred *tcred;
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2012-11-13 06:20:55 -07:00
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cputime_t utime, stime, utimescaled, stimescaled;
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2014-07-16 15:04:34 -06:00
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u64 delta;
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2006-10-01 00:28:55 -06:00
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BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
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2014-07-16 15:04:34 -06:00
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/* calculate task elapsed time in nsec */
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delta = ktime_get_ns() - tsk->start_time;
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/* Convert to micro seconds */
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do_div(delta, NSEC_PER_USEC);
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stats->ac_etime = delta;
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/* Convert to seconds for btime */
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do_div(delta, USEC_PER_SEC);
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stats->ac_btime = get_seconds() - delta;
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2006-10-01 00:28:55 -06:00
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if (thread_group_leader(tsk)) {
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stats->ac_exitcode = tsk->exit_code;
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if (tsk->flags & PF_FORKNOEXEC)
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stats->ac_flag |= AFORK;
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}
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if (tsk->flags & PF_SUPERPRIV)
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stats->ac_flag |= ASU;
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if (tsk->flags & PF_DUMPCORE)
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stats->ac_flag |= ACORE;
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if (tsk->flags & PF_SIGNALED)
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stats->ac_flag |= AXSIG;
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stats->ac_nice = task_nice(tsk);
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stats->ac_sched = tsk->policy;
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2012-02-07 18:56:49 -07:00
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stats->ac_pid = task_pid_nr_ns(tsk, pid_ns);
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2006-10-28 11:38:50 -06:00
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rcu_read_lock();
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2008-11-13 16:39:19 -07:00
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tcred = __task_cred(tsk);
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2012-02-07 18:56:49 -07:00
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stats->ac_uid = from_kuid_munged(user_ns, tcred->uid);
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stats->ac_gid = from_kgid_munged(user_ns, tcred->gid);
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2006-10-28 11:38:50 -06:00
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stats->ac_ppid = pid_alive(tsk) ?
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2012-02-07 18:56:49 -07:00
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task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
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2006-10-28 11:38:50 -06:00
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rcu_read_unlock();
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2012-11-13 06:20:55 -07:00
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task_cputime(tsk, &utime, &stime);
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stats->ac_utime = cputime_to_usecs(utime);
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stats->ac_stime = cputime_to_usecs(stime);
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task_cputime_scaled(tsk, &utimescaled, &stimescaled);
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stats->ac_utimescaled = cputime_to_usecs(utimescaled);
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stats->ac_stimescaled = cputime_to_usecs(stimescaled);
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2006-10-01 00:28:55 -06:00
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stats->ac_minflt = tsk->min_flt;
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stats->ac_majflt = tsk->maj_flt;
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strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
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}
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2006-10-01 00:28:58 -06:00
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#ifdef CONFIG_TASK_XACCT
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2006-10-01 00:29:00 -06:00
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#define KB 1024
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#define MB (1024*KB)
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2011-09-19 18:10:57 -06:00
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#define KB_MASK (~(KB-1))
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2006-10-01 00:28:58 -06:00
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/*
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* fill in extended accounting fields
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*/
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void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
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{
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2006-10-29 23:46:43 -07:00
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struct mm_struct *mm;
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2008-07-25 02:48:40 -06:00
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/* convert pages-usec to Mbyte-usec */
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stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
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stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
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2006-10-29 23:46:43 -07:00
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mm = get_task_mm(p);
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if (mm) {
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2006-10-01 00:29:00 -06:00
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/* adjust to KB unit */
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2009-01-06 15:40:29 -07:00
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stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
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stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
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2006-10-29 23:46:43 -07:00
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mmput(mm);
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2006-10-01 00:28:58 -06:00
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}
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2011-09-19 18:10:57 -06:00
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stats->read_char = p->ioac.rchar & KB_MASK;
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stats->write_char = p->ioac.wchar & KB_MASK;
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stats->read_syscalls = p->ioac.syscr & KB_MASK;
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stats->write_syscalls = p->ioac.syscw & KB_MASK;
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2006-12-10 03:19:53 -07:00
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#ifdef CONFIG_TASK_IO_ACCOUNTING
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2011-09-19 18:10:57 -06:00
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stats->read_bytes = p->ioac.read_bytes & KB_MASK;
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stats->write_bytes = p->ioac.write_bytes & KB_MASK;
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stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
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2006-12-10 03:19:53 -07:00
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#else
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stats->read_bytes = 0;
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stats->write_bytes = 0;
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stats->cancelled_write_bytes = 0;
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#endif
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2006-10-01 00:28:58 -06:00
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}
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2006-10-01 00:29:00 -06:00
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#undef KB
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#undef MB
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2006-10-01 00:28:59 -06:00
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2012-11-13 06:20:55 -07:00
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static void __acct_update_integrals(struct task_struct *tsk,
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cputime_t utime, cputime_t stime)
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2006-10-01 00:28:59 -06:00
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{
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if (likely(tsk->mm)) {
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2008-07-25 02:48:40 -06:00
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cputime_t time, dtime;
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struct timeval value;
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Fix fixpoint divide exception in acct_update_integrals
Frans Pop reported the crash below when running an s390 kernel under Hercules:
Kernel BUG at 000738b4 verbose debug info unavailable!
fixpoint divide exception: 0009 #1! SMP
Modules linked in: nfs lockd nfs_acl sunrpc ctcm fsm tape_34xx
cu3088 tape ccwgroup tape_class ext3 jbd mbcache dm_mirror dm_log dm_snapshot
dm_mod dasd_eckd_mod dasd_mod
CPU: 0 Not tainted 2.6.27.19 #13
Process awk (pid: 2069, task: 0f9ed9b8, ksp: 0f4f7d18)
Krnl PSW : 070c1000 800738b4 (acct_update_integrals+0x4c/0x118)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:1 PM:0
Krnl GPRS: 00000000 000007d0 7fffffff fffff830
00000000 ffffffff 00000002 0f9ed9b8
00000000 00008ca0 00000000 0f9ed9b8
0f9edda4 8007386e 0f4f7ec8 0f4f7e98
Krnl Code: 800738aa: a71807d0 lhi %r1,2000
800738ae: 8c200001 srdl %r2,1
800738b2: 1d21 dr %r2,%r1
>800738b4: 5810d10e l %r1,270(%r13)
800738b8: 1823 lr %r2,%r3
800738ba: 4130f060 la %r3,96(%r15)
800738be: 0de1 basr %r14,%r1
800738c0: 5800f060 l %r0,96(%r15)
Call Trace:
( <000000000004fdea>! blocking_notifier_call_chain+0x1e/0x2c)
<0000000000038502>! do_exit+0x106/0x7c0
<0000000000038c36>! do_group_exit+0x7a/0xb4
<0000000000038c8e>! SyS_exit_group+0x1e/0x30
<0000000000021c28>! sysc_do_restart+0x12/0x16
<0000000077e7e924>! 0x77e7e924
Reason for this is that cpu time accounting usually only happens from
interrupt context, but acct_update_integrals gets also called from
process context with interrupts enabled.
So in acct_update_integrals we may end up with the following scenario:
Between reading tsk->stime/tsk->utime and tsk->acct_timexpd an interrupt
happens which updates accouting values. This causes acct_timexpd to be
greater than the former stime + utime. The subsequent calculation of
dtime = cputime_sub(time, tsk->acct_timexpd);
will be negative and the division performed by
cputime_to_jiffies(dtime)
will generate an exception since the result won't fit into a 32 bit
register.
In order to fix this just always disable interrupts while accessing any
of the accounting values.
Reported by: Frans Pop <elendil@planet.nl>
Tested by: Frans Pop <elendil@planet.nl>
Cc: stable@kernel.org
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-09 06:31:59 -06:00
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unsigned long flags;
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2008-07-25 02:48:40 -06:00
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u64 delta;
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Fix fixpoint divide exception in acct_update_integrals
Frans Pop reported the crash below when running an s390 kernel under Hercules:
Kernel BUG at 000738b4 verbose debug info unavailable!
fixpoint divide exception: 0009 #1! SMP
Modules linked in: nfs lockd nfs_acl sunrpc ctcm fsm tape_34xx
cu3088 tape ccwgroup tape_class ext3 jbd mbcache dm_mirror dm_log dm_snapshot
dm_mod dasd_eckd_mod dasd_mod
CPU: 0 Not tainted 2.6.27.19 #13
Process awk (pid: 2069, task: 0f9ed9b8, ksp: 0f4f7d18)
Krnl PSW : 070c1000 800738b4 (acct_update_integrals+0x4c/0x118)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:1 PM:0
Krnl GPRS: 00000000 000007d0 7fffffff fffff830
00000000 ffffffff 00000002 0f9ed9b8
00000000 00008ca0 00000000 0f9ed9b8
0f9edda4 8007386e 0f4f7ec8 0f4f7e98
Krnl Code: 800738aa: a71807d0 lhi %r1,2000
800738ae: 8c200001 srdl %r2,1
800738b2: 1d21 dr %r2,%r1
>800738b4: 5810d10e l %r1,270(%r13)
800738b8: 1823 lr %r2,%r3
800738ba: 4130f060 la %r3,96(%r15)
800738be: 0de1 basr %r14,%r1
800738c0: 5800f060 l %r0,96(%r15)
Call Trace:
( <000000000004fdea>! blocking_notifier_call_chain+0x1e/0x2c)
<0000000000038502>! do_exit+0x106/0x7c0
<0000000000038c36>! do_group_exit+0x7a/0xb4
<0000000000038c8e>! SyS_exit_group+0x1e/0x30
<0000000000021c28>! sysc_do_restart+0x12/0x16
<0000000077e7e924>! 0x77e7e924
Reason for this is that cpu time accounting usually only happens from
interrupt context, but acct_update_integrals gets also called from
process context with interrupts enabled.
So in acct_update_integrals we may end up with the following scenario:
Between reading tsk->stime/tsk->utime and tsk->acct_timexpd an interrupt
happens which updates accouting values. This causes acct_timexpd to be
greater than the former stime + utime. The subsequent calculation of
dtime = cputime_sub(time, tsk->acct_timexpd);
will be negative and the division performed by
cputime_to_jiffies(dtime)
will generate an exception since the result won't fit into a 32 bit
register.
In order to fix this just always disable interrupts while accessing any
of the accounting values.
Reported by: Frans Pop <elendil@planet.nl>
Tested by: Frans Pop <elendil@planet.nl>
Cc: stable@kernel.org
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-09 06:31:59 -06:00
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local_irq_save(flags);
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2012-11-13 06:20:55 -07:00
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time = stime + utime;
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2011-12-15 06:56:09 -07:00
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dtime = time - tsk->acct_timexpd;
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2008-07-25 02:48:40 -06:00
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jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
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delta = value.tv_sec;
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delta = delta * USEC_PER_SEC + value.tv_usec;
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2006-10-01 00:28:59 -06:00
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if (delta == 0)
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Fix fixpoint divide exception in acct_update_integrals
Frans Pop reported the crash below when running an s390 kernel under Hercules:
Kernel BUG at 000738b4 verbose debug info unavailable!
fixpoint divide exception: 0009 #1! SMP
Modules linked in: nfs lockd nfs_acl sunrpc ctcm fsm tape_34xx
cu3088 tape ccwgroup tape_class ext3 jbd mbcache dm_mirror dm_log dm_snapshot
dm_mod dasd_eckd_mod dasd_mod
CPU: 0 Not tainted 2.6.27.19 #13
Process awk (pid: 2069, task: 0f9ed9b8, ksp: 0f4f7d18)
Krnl PSW : 070c1000 800738b4 (acct_update_integrals+0x4c/0x118)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:1 PM:0
Krnl GPRS: 00000000 000007d0 7fffffff fffff830
00000000 ffffffff 00000002 0f9ed9b8
00000000 00008ca0 00000000 0f9ed9b8
0f9edda4 8007386e 0f4f7ec8 0f4f7e98
Krnl Code: 800738aa: a71807d0 lhi %r1,2000
800738ae: 8c200001 srdl %r2,1
800738b2: 1d21 dr %r2,%r1
>800738b4: 5810d10e l %r1,270(%r13)
800738b8: 1823 lr %r2,%r3
800738ba: 4130f060 la %r3,96(%r15)
800738be: 0de1 basr %r14,%r1
800738c0: 5800f060 l %r0,96(%r15)
Call Trace:
( <000000000004fdea>! blocking_notifier_call_chain+0x1e/0x2c)
<0000000000038502>! do_exit+0x106/0x7c0
<0000000000038c36>! do_group_exit+0x7a/0xb4
<0000000000038c8e>! SyS_exit_group+0x1e/0x30
<0000000000021c28>! sysc_do_restart+0x12/0x16
<0000000077e7e924>! 0x77e7e924
Reason for this is that cpu time accounting usually only happens from
interrupt context, but acct_update_integrals gets also called from
process context with interrupts enabled.
So in acct_update_integrals we may end up with the following scenario:
Between reading tsk->stime/tsk->utime and tsk->acct_timexpd an interrupt
happens which updates accouting values. This causes acct_timexpd to be
greater than the former stime + utime. The subsequent calculation of
dtime = cputime_sub(time, tsk->acct_timexpd);
will be negative and the division performed by
cputime_to_jiffies(dtime)
will generate an exception since the result won't fit into a 32 bit
register.
In order to fix this just always disable interrupts while accessing any
of the accounting values.
Reported by: Frans Pop <elendil@planet.nl>
Tested by: Frans Pop <elendil@planet.nl>
Cc: stable@kernel.org
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-09 06:31:59 -06:00
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goto out;
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2008-07-25 02:48:40 -06:00
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tsk->acct_timexpd = time;
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2006-10-01 00:28:59 -06:00
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tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
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tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
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Fix fixpoint divide exception in acct_update_integrals
Frans Pop reported the crash below when running an s390 kernel under Hercules:
Kernel BUG at 000738b4 verbose debug info unavailable!
fixpoint divide exception: 0009 #1! SMP
Modules linked in: nfs lockd nfs_acl sunrpc ctcm fsm tape_34xx
cu3088 tape ccwgroup tape_class ext3 jbd mbcache dm_mirror dm_log dm_snapshot
dm_mod dasd_eckd_mod dasd_mod
CPU: 0 Not tainted 2.6.27.19 #13
Process awk (pid: 2069, task: 0f9ed9b8, ksp: 0f4f7d18)
Krnl PSW : 070c1000 800738b4 (acct_update_integrals+0x4c/0x118)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:1 PM:0
Krnl GPRS: 00000000 000007d0 7fffffff fffff830
00000000 ffffffff 00000002 0f9ed9b8
00000000 00008ca0 00000000 0f9ed9b8
0f9edda4 8007386e 0f4f7ec8 0f4f7e98
Krnl Code: 800738aa: a71807d0 lhi %r1,2000
800738ae: 8c200001 srdl %r2,1
800738b2: 1d21 dr %r2,%r1
>800738b4: 5810d10e l %r1,270(%r13)
800738b8: 1823 lr %r2,%r3
800738ba: 4130f060 la %r3,96(%r15)
800738be: 0de1 basr %r14,%r1
800738c0: 5800f060 l %r0,96(%r15)
Call Trace:
( <000000000004fdea>! blocking_notifier_call_chain+0x1e/0x2c)
<0000000000038502>! do_exit+0x106/0x7c0
<0000000000038c36>! do_group_exit+0x7a/0xb4
<0000000000038c8e>! SyS_exit_group+0x1e/0x30
<0000000000021c28>! sysc_do_restart+0x12/0x16
<0000000077e7e924>! 0x77e7e924
Reason for this is that cpu time accounting usually only happens from
interrupt context, but acct_update_integrals gets also called from
process context with interrupts enabled.
So in acct_update_integrals we may end up with the following scenario:
Between reading tsk->stime/tsk->utime and tsk->acct_timexpd an interrupt
happens which updates accouting values. This causes acct_timexpd to be
greater than the former stime + utime. The subsequent calculation of
dtime = cputime_sub(time, tsk->acct_timexpd);
will be negative and the division performed by
cputime_to_jiffies(dtime)
will generate an exception since the result won't fit into a 32 bit
register.
In order to fix this just always disable interrupts while accessing any
of the accounting values.
Reported by: Frans Pop <elendil@planet.nl>
Tested by: Frans Pop <elendil@planet.nl>
Cc: stable@kernel.org
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-09 06:31:59 -06:00
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out:
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local_irq_restore(flags);
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2006-10-01 00:28:59 -06:00
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}
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}
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2012-11-13 06:20:55 -07:00
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/**
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* acct_update_integrals - update mm integral fields in task_struct
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* @tsk: task_struct for accounting
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*/
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void acct_update_integrals(struct task_struct *tsk)
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{
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cputime_t utime, stime;
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task_cputime(tsk, &utime, &stime);
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__acct_update_integrals(tsk, utime, stime);
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}
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/**
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* acct_account_cputime - update mm integral after cputime update
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* @tsk: task_struct for accounting
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*/
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void acct_account_cputime(struct task_struct *tsk)
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{
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__acct_update_integrals(tsk, tsk->utime, tsk->stime);
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}
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2006-10-01 00:28:59 -06:00
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/**
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* acct_clear_integrals - clear the mm integral fields in task_struct
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* @tsk: task_struct whose accounting fields are cleared
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*/
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void acct_clear_integrals(struct task_struct *tsk)
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{
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2008-07-25 02:48:40 -06:00
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tsk->acct_timexpd = 0;
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2006-10-01 00:28:59 -06:00
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tsk->acct_rss_mem1 = 0;
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tsk->acct_vm_mem1 = 0;
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}
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2006-10-01 00:28:58 -06:00
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#endif
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