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- Redefine p_swtime and td_slptime as p_swtick and td_slptick. This

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changes the units from seconds to the value of 'ticks' when swapped
   in/out.  ULE does not have a periodic timer that scans all threads in
   the system and as such maintaining a per-second counter is difficult.
 - Change computations requiring the unit in seconds to subtract ticks
   and divide by hz.  This does make the wraparound condition hz times
   more frequent but this is still in the range of several months to
   years and the adverse effects are minimal.

Approved by:    re
This commit is contained in:
jeff 2007-09-21 05:07:07 +00:00
parent 22dc0ec6a9
commit e132f56a45
1 changed files with 14 additions and 9 deletions
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23
sys/vm/vm_glue.c
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@ -636,7 +636,7 @@ faultin(p)
PROC_LOCK(p);
PROC_SLOCK(p);
swapclear(p);
p->p_swtime = 0;
p->p_swtick = ticks;
PROC_SUNLOCK(p);
wakeup(&p->p_flag);
@ -663,9 +663,11 @@ scheduler(dummy)
{
struct proc *p;
struct thread *td;
int pri;
struct proc *pp;
int slptime;
int swtime;
int ppri;
int pri;
mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
mtx_unlock(&Giant);
@ -688,6 +690,7 @@ scheduler(dummy)
PROC_UNLOCK(p);
continue;
}
swtime = (ticks - p->p_swtick) / hz;
PROC_SLOCK(p);
FOREACH_THREAD_IN_PROC(p, td) {
/*
@ -697,7 +700,8 @@ scheduler(dummy)
*/
thread_lock(td);
if (td->td_inhibitors == TDI_SWAPPED) {
pri = p->p_swtime + td->td_slptime;
slptime = (ticks - td->td_slptick) / hz;
pri = swtime + slptime;
if ((td->td_flags & TDF_SWAPINREQ) == 0)
pri -= p->p_nice * 8;
/*
@ -816,6 +820,7 @@ int action;
FOREACH_PROC_IN_SYSTEM(p) {
struct vmspace *vm;
int minslptime = 100000;
int slptime;
/*
* Watch out for a process in
@ -882,12 +887,12 @@ int action;
thread_unlock(td);
goto nextproc;
}
slptime = (ticks - td->td_slptick) / hz;
/*
* Guarantee swap_idle_threshold1
* time in memory.
*/
if (td->td_slptime < swap_idle_threshold1) {
if (slptime < swap_idle_threshold1) {
thread_unlock(td);
goto nextproc;
}
@ -914,13 +919,13 @@ int action;
*/
if (((action & VM_SWAP_NORMAL) == 0) &&
(((action & VM_SWAP_IDLE) == 0) ||
(td->td_slptime < swap_idle_threshold2))) {
(slptime < swap_idle_threshold2))) {
thread_unlock(td);
goto nextproc;
}
if (minslptime > td->td_slptime)
minslptime = td->td_slptime;
if (minslptime > slptime)
minslptime = slptime;
thread_unlock(td);
}
@ -1038,7 +1043,7 @@ swapout(p)
PROC_LOCK(p);
p->p_flag &= ~P_SWAPPINGOUT;
PROC_SLOCK(p);
p->p_swtime = 0;
p->p_swtick = ticks;
return (0);
}
#endif /* !NO_SWAPPING */