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Instead of recording the Unix time in a process when it starts, record the

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uptime.  Where necessary, convert it back to Unix time by adding boottime
to it.  This fixes a potential problem in the accounting code, which would
compute the elapsed time incorrectly if the Unix time was stepped during
the lifetime of the process.
This commit is contained in:
Dag-Erling Smørgrav 2003-05-01 16:59:23 +00:00
parent 09a80d4867
commit 87ccef7b77
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=114434
7 changed files with 15 additions and 11 deletions
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10
sys/fs/procfs/procfs_status.c
View File

@ -42,6 +42,7 @@
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/exec.h>
#include <sys/lock.h>
@ -129,13 +130,14 @@ procfs_doprocstatus(PFS_FILL_ARGS)
}
if (p->p_sflag & PS_INMEM) {
struct timeval ut, st;
struct timeval start, ut, st;
calcru(p, &ut, &st, (struct timeval *) NULL);
mtx_unlock_spin(&sched_lock);
sbuf_printf(sb, " %lld,%ld %ld,%ld %ld,%ld",
(long long)p->p_stats->p_start.tv_sec,
p->p_stats->p_start.tv_usec,
start = p->p_stats->p_start;
timevaladd(&start, &boottime);
sbuf_printf(sb, " %ld,%ld %ld,%ld %ld,%ld",
start.tv_sec, start.tv_usec,
ut.tv_sec, ut.tv_usec,
st.tv_sec, st.tv_usec);
} else {

2
sys/kern/init_main.c
View File

@ -467,7 +467,7 @@ proc0_post(void *dummy __unused)
*/
sx_slock(&allproc_lock);
LIST_FOREACH(p, &allproc, p_list) {
microtime(&p->p_stats->p_start);
microuptime(&p->p_stats->p_start);
p->p_runtime.sec = 0;
p->p_runtime.frac = 0;
}

6
sys/kern/kern_acct.c
View File

@ -250,8 +250,10 @@ acct_process(td)
acct.ac_stime = encode_comp_t(st.tv_sec, st.tv_usec);
/* (3) The elapsed time the command ran (and its starting time) */
acct.ac_btime = p->p_stats->p_start.tv_sec;
microtime(&tmp);
tmp = boottime;
timevaladd(&tmp, &p->p_stats->p_start);
acct.ac_btime = tmp.tv_sec;
microuptime(&tmp);
timevalsub(&tmp, &p->p_stats->p_start);
acct.ac_etime = encode_comp_t(tmp.tv_sec, tmp.tv_usec);

2
sys/kern/kern_fork.c
View File

@ -686,7 +686,7 @@ fork1(td, flags, pages, procp)
* If RFSTOPPED not requested, make child runnable and add to
* run queue.
*/
microtime(&(p2->p_stats->p_start));
microuptime(&p2->p_stats->p_start);
if ((flags & RFSTOPPED) == 0) {
mtx_lock_spin(&sched_lock);
p2->p_state = PRS_NORMAL;

2
sys/kern/kern_kthread.c
View File

@ -79,7 +79,7 @@ kthread_create(void (*func)(void *), void *arg,
struct thread *td;
struct proc *p2;
if (!proc0.p_stats /* || proc0.p_stats->p_start.tv_sec == 0 */)
if (!proc0.p_stats)
panic("kthread_create called too soon");
error = fork1(&thread0, RFMEM | RFFDG | RFPROC | RFSTOPPED | flags,

3
sys/kern/kern_proc.c
View File

@ -677,8 +677,7 @@ fill_kinfo_proc(p, kp)
}
if ((p->p_sflag & PS_INMEM) && p->p_stats) {
kp->ki_start = p->p_stats->p_start;
if (kp->ki_start.tv_sec < 3600)
kp->ki_start.tv_sec += boottime.tv_sec;
timevaladd(&kp->ki_start, &boottime);
kp->ki_rusage = p->p_stats->p_ru;
kp->ki_childtime.tv_sec = p->p_stats->p_cru.ru_utime.tv_sec +
p->p_stats->p_cru.ru_stime.tv_sec;

1
sys/nfsclient/nfs_lock.c
View File

@ -115,6 +115,7 @@ nfs_dolock(struct vop_advlock_args *ap)
MALLOC(p->p_nlminfo, struct nlminfo *,
sizeof(struct nlminfo), M_LOCKF, M_WAITOK | M_ZERO);
p->p_nlminfo->pid_start = p->p_stats->p_start;
timevaladd(&p->p_nlminfo->pid_start, &boottime);
}
msg.lm_msg_ident.pid_start = p->p_nlminfo->pid_start;
msg.lm_msg_ident.msg_seq = ++(p->p_nlminfo->msg_seq);