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Split calcru() back into a calcru1() function shared with calccru() and

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a calcru() wrapper that passes a local rusage_ext on the stack that is
a snapshot to do the calculations on.  Now we can pass p->p_crux to
calcru1() in calccru() again which fixes the issues with runtime going
backwards messages when dead processes are harvested by init.

Reviewed by:	phk
Tested by:	Stefan Ehmann shoesoft at gmx dot net
This commit is contained in:
John Baldwin 2006-02-21 21:47:46 +00:00
parent 0c05ab41ab
commit 6fc6433ecd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=155882
1 changed files with 33 additions and 10 deletions
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43
sys/kern/kern_resource.c
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@ -69,6 +69,8 @@ static struct mtx uihashtbl_mtx;
static LIST_HEAD(uihashhead, uidinfo) *uihashtbl;
static u_long uihash; /* size of hash table - 1 */
static void calcru1(struct proc *p, struct rusage_ext *ruxp,
struct timeval *up, struct timeval *sp);
static int donice(struct thread *td, struct proc *chgp, int n);
static struct uidinfo *uilookup(uid_t uid);
@ -692,6 +694,10 @@ getrlimit(td, uap)
return (error);
}
/*
* Transform the running time and tick information for childern of proc p
* into user, system, and interrupt time usage.
*/
void
calccru(p, up, sp)
struct proc *p;
@ -700,7 +706,7 @@ calccru(p, up, sp)
{
PROC_LOCK_ASSERT(p, MA_OWNED);
calcru(p, up, sp);
calcru1(p, &p->p_crux, up, sp);
}
/*
@ -708,37 +714,54 @@ calccru(p, up, sp)
* system, and interrupt time usage. If appropriate, include the current
* time slice on this CPU.
*/
void
calcru(struct proc *p, struct timeval *up, struct timeval *sp)
{
struct thread *td;
struct rusage_ext *ruxp = &p->p_rux;
struct rusage_ext rux;
uint64_t u;
/* {user, system, interrupt, total} {ticks, usec}; previous tu: */
u_int64_t ut, uu, st, su, it, iu, tt, tu, ptu;
PROC_LOCK_ASSERT(p, MA_OWNED);
mtx_assert(&sched_lock, MA_NOTOWNED);
mtx_lock_spin(&sched_lock);
/*
* If we are getting stats for the current process, then add in the
* stats that this thread has accumulated in its current time slice.
* We reset the thread and CPU state as if we had performed a context
* switch right here.
*/
if (curthread->td_proc == p) {
td = curthread;
u = cpu_ticks();
ruxp->rux_runtime += (u - PCPU_GET(switchtime));
p->p_rux.rux_runtime += u - PCPU_GET(switchtime);
PCPU_SET(switchtime, u);
ruxp->rux_uticks += td->td_uticks;
p->p_rux.rux_uticks += td->td_uticks;
td->td_uticks = 0;
ruxp->rux_iticks += td->td_iticks;
p->p_rux.rux_iticks += td->td_iticks;
td->td_iticks = 0;
ruxp->rux_sticks += td->td_sticks;
p->p_rux.rux_sticks += td->td_sticks;
td->td_sticks = 0;
}
rux = p->p_rux;
mtx_unlock_spin(&sched_lock);
calcru1(p, &rux, up, sp);
p->p_rux.rux_uu = rux.rux_uu;
p->p_rux.rux_su = rux.rux_su;
p->p_rux.rux_iu = rux.rux_iu;
}
static void
calcru1(struct proc *p, struct rusage_ext *ruxp, struct timeval *up,
struct timeval *sp)
{
/* {user, system, interrupt, total} {ticks, usec}; previous tu: */
u_int64_t ut, uu, st, su, it, iu, tt, tu, ptu;
ut = ruxp->rux_uticks;
st = ruxp->rux_sticks;
it = ruxp->rux_iticks;
tu = ruxp->rux_runtime;
mtx_unlock_spin(&sched_lock);
tu = cputick2usec(tu);
tt = ut + st + it;
if (tt == 0) {