Commit | Line | Data |
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b32450f4 | 1 | /* kern_synch.c 4.23 82/10/17 */ |
a379cce8 BJ |
2 | |
3 | #include "../h/param.h" | |
4 | #include "../h/systm.h" | |
5 | #include "../h/dir.h" | |
6 | #include "../h/user.h" | |
7 | #include "../h/proc.h" | |
8 | #include "../h/file.h" | |
9 | #include "../h/inode.h" | |
10 | #include "../h/vm.h" | |
11 | #include "../h/pte.h" | |
1edb1cf8 | 12 | #ifdef MUSH |
9c25520d | 13 | #include "../h/quota.h" |
1edb1cf8 BJ |
14 | #include "../h/share.h" |
15 | #endif | |
16 | #include "../h/kernel.h" | |
17 | #include "../h/buf.h" | |
206ecc72 | 18 | #include "../vax/mtpr.h" /* XXX */ |
1edb1cf8 BJ |
19 | |
20 | /* | |
21 | * Force switch among equal priority processes every 100ms. | |
22 | */ | |
23 | roundrobin() | |
24 | { | |
25 | ||
26 | runrun++; | |
27 | aston(); | |
b32450f4 | 28 | timeout(roundrobin, (caddr_t)0, hz / 10); |
1edb1cf8 BJ |
29 | } |
30 | ||
d01b68d6 | 31 | /* constants to digital decay and forget 90% of usage in 5*loadav time */ |
1edb1cf8 BJ |
32 | #undef ave |
33 | #define ave(a,b) ((int)(((int)(a*b))/(b+1))) | |
34 | int nrscale = 2; | |
35 | double avenrun[]; | |
1edb1cf8 BJ |
36 | double ccpu = 0.95122942450071400909; /* exp(-1/20) */ |
37 | ||
1edb1cf8 BJ |
38 | /* |
39 | * Recompute process priorities, once a second | |
40 | */ | |
41 | schedcpu() | |
42 | { | |
43 | register struct proc *p; | |
44 | register int s, a; | |
45 | ||
1edb1cf8 | 46 | wakeup((caddr_t)&lbolt); |
1edb1cf8 BJ |
47 | for (p = proc; p < procNPROC; p++) if (p->p_stat && p->p_stat!=SZOMB) { |
48 | #ifdef MUSH | |
1edb1cf8 BJ |
49 | if (p->p_quota->q_uid) |
50 | p->p_quota->q_cost += | |
51 | shconsts.sc_click * p->p_rssize; | |
52 | #endif | |
53 | if (p->p_time != 127) | |
54 | p->p_time++; | |
1edb1cf8 BJ |
55 | if (p->p_stat==SSLEEP || p->p_stat==SSTOP) |
56 | if (p->p_slptime != 127) | |
57 | p->p_slptime++; | |
58 | if (p->p_flag&SLOAD) | |
59 | p->p_pctcpu = ccpu * p->p_pctcpu + | |
60 | (1.0 - ccpu) * (p->p_cpticks/(float)hz); | |
61 | p->p_cpticks = 0; | |
62 | #ifdef MUSH | |
63 | a = ave((p->p_cpu & 0377), avenrun[0]*nrscale) + | |
64 | p->p_nice - NZERO + p->p_quota->q_nice; | |
65 | #else | |
66 | a = ave((p->p_cpu & 0377), avenrun[0]*nrscale) + | |
67 | p->p_nice - NZERO; | |
68 | #endif | |
69 | if (a < 0) | |
70 | a = 0; | |
71 | if (a > 255) | |
72 | a = 255; | |
73 | p->p_cpu = a; | |
74 | (void) setpri(p); | |
75 | s = spl6(); /* prevent state changes */ | |
76 | if (p->p_pri >= PUSER) { | |
77 | if ((p != u.u_procp || noproc) && | |
78 | p->p_stat == SRUN && | |
79 | (p->p_flag & SLOAD) && | |
80 | p->p_pri != p->p_usrpri) { | |
81 | remrq(p); | |
82 | p->p_pri = p->p_usrpri; | |
83 | setrq(p); | |
84 | } else | |
85 | p->p_pri = p->p_usrpri; | |
86 | } | |
87 | splx(s); | |
88 | } | |
89 | vmmeter(); | |
90 | if (runin!=0) { | |
91 | runin = 0; | |
92 | wakeup((caddr_t)&runin); | |
93 | } | |
94 | if (bclnlist != NULL) | |
95 | wakeup((caddr_t)&proc[2]); | |
b32450f4 | 96 | timeout(schedcpu, (caddr_t)0, hz); |
1edb1cf8 | 97 | } |
a379cce8 BJ |
98 | |
99 | #define SQSIZE 0100 /* Must be power of 2 */ | |
100 | #define HASH(x) (( (int) x >> 5) & (SQSIZE-1)) | |
101 | struct proc *slpque[SQSIZE]; | |
102 | ||
103 | /* | |
104 | * Give up the processor till a wakeup occurs | |
105 | * on chan, at which time the process | |
106 | * enters the scheduling queue at priority pri. | |
107 | * The most important effect of pri is that when | |
108 | * pri<=PZERO a signal cannot disturb the sleep; | |
109 | * if pri>PZERO signals will be processed. | |
110 | * Callers of this routine must be prepared for | |
111 | * premature return, and check that the reason for | |
112 | * sleeping has gone away. | |
113 | */ | |
114 | sleep(chan, pri) | |
bd76c595 BJ |
115 | caddr_t chan; |
116 | int pri; | |
a379cce8 | 117 | { |
e5df4be8 | 118 | register struct proc *rp, **hp; |
6fdc0335 | 119 | register s; |
a379cce8 BJ |
120 | |
121 | rp = u.u_procp; | |
122 | s = spl6(); | |
123 | if (chan==0 || rp->p_stat != SRUN || rp->p_rlink) | |
124 | panic("sleep"); | |
a379cce8 BJ |
125 | rp->p_wchan = chan; |
126 | rp->p_slptime = 0; | |
127 | rp->p_pri = pri; | |
e5df4be8 BJ |
128 | hp = &slpque[HASH(chan)]; |
129 | rp->p_link = *hp; | |
130 | *hp = rp; | |
18a4549b BJ |
131 | if (pri > PZERO) { |
132 | if (ISSIG(rp)) { | |
e5df4be8 BJ |
133 | if (rp->p_wchan) |
134 | unsleep(rp); | |
a379cce8 | 135 | rp->p_stat = SRUN; |
81263dba | 136 | (void) spl0(); |
a379cce8 BJ |
137 | goto psig; |
138 | } | |
e5df4be8 BJ |
139 | if (rp->p_wchan == 0) |
140 | goto out; | |
141 | rp->p_stat = SSLEEP; | |
81263dba | 142 | (void) spl0(); |
bd76c595 | 143 | u.u_ru.ru_nvcsw++; |
a379cce8 | 144 | swtch(); |
18a4549b | 145 | if (ISSIG(rp)) |
a379cce8 BJ |
146 | goto psig; |
147 | } else { | |
6fdc0335 | 148 | rp->p_stat = SSLEEP; |
81263dba | 149 | (void) spl0(); |
bd76c595 | 150 | u.u_ru.ru_nvcsw++; |
a379cce8 BJ |
151 | swtch(); |
152 | } | |
e5df4be8 | 153 | out: |
a379cce8 BJ |
154 | splx(s); |
155 | return; | |
156 | ||
157 | /* | |
158 | * If priority was low (>PZERO) and | |
18a4549b | 159 | * there has been a signal, execute non-local goto through |
d01b68d6 | 160 | * u.u_qsave, aborting the system call in progress (see trap.c) |
18a4549b | 161 | * (or finishing a tsleep, see below) |
a379cce8 BJ |
162 | */ |
163 | psig: | |
d01b68d6 | 164 | longjmp(&u.u_qsave); |
a379cce8 BJ |
165 | /*NOTREACHED*/ |
166 | } | |
167 | ||
87d0f32e BJ |
168 | /* |
169 | * Remove a process from its wait queue | |
170 | */ | |
171 | unsleep(p) | |
18a4549b | 172 | register struct proc *p; |
87d0f32e BJ |
173 | { |
174 | register struct proc **hp; | |
175 | register s; | |
176 | ||
177 | s = spl6(); | |
178 | if (p->p_wchan) { | |
179 | hp = &slpque[HASH(p->p_wchan)]; | |
180 | while (*hp != p) | |
181 | hp = &(*hp)->p_link; | |
182 | *hp = p->p_link; | |
183 | p->p_wchan = 0; | |
184 | } | |
185 | splx(s); | |
186 | } | |
187 | ||
a379cce8 BJ |
188 | /* |
189 | * Wake up all processes sleeping on chan. | |
190 | */ | |
191 | wakeup(chan) | |
18a4549b | 192 | register caddr_t chan; |
a379cce8 | 193 | { |
e5df4be8 | 194 | register struct proc *p, **q, **h; |
a379cce8 BJ |
195 | int s; |
196 | ||
197 | s = spl6(); | |
e5df4be8 | 198 | h = &slpque[HASH(chan)]; |
a379cce8 | 199 | restart: |
e5df4be8 | 200 | for (q = h; p = *q; ) { |
87d0f32e | 201 | if (p->p_rlink || p->p_stat != SSLEEP && p->p_stat != SSTOP) |
a379cce8 | 202 | panic("wakeup"); |
6fdc0335 | 203 | if (p->p_wchan==chan) { |
a379cce8 | 204 | p->p_wchan = 0; |
e5df4be8 | 205 | *q = p->p_link; |
a379cce8 | 206 | p->p_slptime = 0; |
87d0f32e BJ |
207 | if (p->p_stat == SSLEEP) { |
208 | /* OPTIMIZED INLINE EXPANSION OF setrun(p) */ | |
209 | p->p_stat = SRUN; | |
c74c8a79 | 210 | if (p->p_flag & SLOAD) |
87d0f32e | 211 | setrq(p); |
18a4549b | 212 | if (p->p_pri < curpri) { |
87d0f32e | 213 | runrun++; |
534d9295 BJ |
214 | aston(); |
215 | } | |
7eb2e67e BJ |
216 | if ((p->p_flag&SLOAD) == 0) { |
217 | if (runout != 0) { | |
218 | runout = 0; | |
219 | wakeup((caddr_t)&runout); | |
220 | } | |
221 | wantin++; | |
87d0f32e BJ |
222 | } |
223 | /* END INLINE EXPANSION */ | |
e5df4be8 | 224 | goto restart; |
a379cce8 | 225 | } |
e5df4be8 BJ |
226 | } else |
227 | q = &p->p_link; | |
a379cce8 BJ |
228 | } |
229 | splx(s); | |
230 | } | |
231 | ||
a379cce8 BJ |
232 | /* |
233 | * Initialize the (doubly-linked) run queues | |
234 | * to be empty. | |
235 | */ | |
236 | rqinit() | |
237 | { | |
238 | register int i; | |
239 | ||
240 | for (i = 0; i < NQS; i++) | |
241 | qs[i].ph_link = qs[i].ph_rlink = (struct proc *)&qs[i]; | |
242 | } | |
a379cce8 BJ |
243 | |
244 | /* | |
245 | * Set the process running; | |
246 | * arrange for it to be swapped in if necessary. | |
247 | */ | |
248 | setrun(p) | |
18a4549b | 249 | register struct proc *p; |
a379cce8 | 250 | { |
18a4549b | 251 | register int s; |
a379cce8 BJ |
252 | |
253 | s = spl6(); | |
254 | switch (p->p_stat) { | |
255 | ||
256 | case 0: | |
257 | case SWAIT: | |
258 | case SRUN: | |
259 | case SZOMB: | |
260 | default: | |
261 | panic("setrun"); | |
262 | ||
6fdc0335 | 263 | case SSTOP: |
a379cce8 | 264 | case SSLEEP: |
87d0f32e | 265 | unsleep(p); /* e.g. when sending signals */ |
a379cce8 BJ |
266 | break; |
267 | ||
268 | case SIDL: | |
a379cce8 BJ |
269 | break; |
270 | } | |
271 | p->p_stat = SRUN; | |
272 | if (p->p_flag & SLOAD) | |
273 | setrq(p); | |
274 | splx(s); | |
18a4549b | 275 | if (p->p_pri < curpri) { |
a379cce8 | 276 | runrun++; |
534d9295 BJ |
277 | aston(); |
278 | } | |
7eb2e67e | 279 | if ((p->p_flag&SLOAD) == 0) { |
18a4549b | 280 | if (runout != 0) { |
7eb2e67e BJ |
281 | runout = 0; |
282 | wakeup((caddr_t)&runout); | |
283 | } | |
284 | wantin++; | |
a379cce8 BJ |
285 | } |
286 | } | |
287 | ||
288 | /* | |
289 | * Set user priority. | |
290 | * The rescheduling flag (runrun) | |
291 | * is set if the priority is better | |
292 | * than the currently running process. | |
293 | */ | |
294 | setpri(pp) | |
18a4549b | 295 | register struct proc *pp; |
a379cce8 | 296 | { |
18a4549b | 297 | register int p; |
a379cce8 | 298 | |
16a64baa | 299 | p = (pp->p_cpu & 0377)/4; |
598563b5 | 300 | p += PUSER + 2*(pp->p_nice - NZERO); |
9afea775 BJ |
301 | if (pp->p_rssize > pp->p_maxrss && freemem < desfree) |
302 | p += 2*4; /* effectively, nice(4) */ | |
18a4549b | 303 | if (p > 127) |
a379cce8 | 304 | p = 127; |
18a4549b | 305 | if (p < curpri) { |
a379cce8 | 306 | runrun++; |
a51a6e74 BJ |
307 | aston(); |
308 | } | |
a379cce8 | 309 | pp->p_usrpri = p; |
18a4549b | 310 | return (p); |
a379cce8 | 311 | } |