ref: 249dc0489c7b24371e1f829e9c849fa7464f6c0c
dir: /emu/port/devmem.c/
#include "dat.h"
#include "fns.h"
#include "error.h"
#include "interp.h"
enum
{
Qdir,
Qctl,
Qstate,
Qsum,
Qevent,
Qprof,
Qheap,
Qgc
};
static
Dirtab memdir[] =
{
".", {Qdir, 0, QTDIR}, 0, DMDIR|0555,
"memctl", {Qctl}, 0, 0666,
"memstate", {Qstate}, 0, 0444,
"memsum", {Qsum}, 0, 0444,
"memevent", {Qevent}, 0, 0444,
"memprof", {Qprof}, 0, 0444,
"memheap", {Qheap}, 0, 0444,
"memgc", {Qgc}, 0, 0444,
};
enum
{
/* these are the top two bits of size */
Pflags= 3<<30,
Pfree= 0<<30,
Palloc= 1<<30,
Paend= 2<<30,
Pimmutable= 3<<30,
Npool = 3,
Nevent = 10000,
Nstate = 12000
};
/*
* pool snapshots
*/
typedef struct Pstate Pstate;
struct Pstate
{
ulong base;
ulong size;
};
static struct
{
Pstate state[3+Nstate];
Pstate* lim;
Pstate* ptr;
int summary;
} poolstate[Npool];
static Ref stateopen;
/*
* pool/heap allocation events
*/
typedef struct Pevent Pevent;
struct Pevent
{
int pool;
ulong pc;
ulong base;
ulong size;
};
static struct
{
Lock l;
Ref inuse;
Rendez r;
int open;
Pevent events[Nevent];
int rd;
int wr;
int full;
int want;
ulong lost;
} poolevents;
/*
* allocation profiles
*/
typedef struct Pprof Pprof;
typedef struct Pbucket Pbucket;
struct Pbucket
{
ulong val;
ulong pool;
ulong count;
ulong size;
Pbucket* next;
};
static struct {
Ref inuse; /* only one of these things */
Lock l;
Pbucket buckets[1000];
Pbucket snap[1000];
int used;
int snapped;
Pbucket* hash[128];
ulong lost;
} memprof;
extern void (*memmonitor)(int, ulong, ulong, ulong);
extern ulong gcnruns;
extern ulong gcsweeps;
extern ulong gcbroken;
extern ulong gchalted;
extern ulong gcepochs;
extern uvlong gcdestroys;
extern uvlong gcinspects;
extern uvlong gcbusy;
extern uvlong gcidle;
extern uvlong gcidlepass;
extern uvlong gcpartial;
static void
mprofreset(void)
{
lock(&memprof.l); /* need ilock in kernel */
memset(memprof.hash, 0, sizeof(memprof.hash));
memprof.used = 0;
memprof.lost = 0;
unlock(&memprof.l);
}
static void
mprofmonitor(int pool, ulong pc, ulong base, ulong size)
{
Pbucket **h0, **h, *p;
if((pool&7) == 1)
return; /* ignore heap */
USED(base);
h0 = &memprof.hash[((pc>>16)^(pc>>4))&(nelem(memprof.hash)-1)];
lock(&memprof.l);
for(h = h0; (p = *h) != nil; h = &p->next)
if(p->val == pc && p->pool == pool){
p->count++;
p->size += size;
*h = p->next;
p->next = *h0;
*h0 = p;
unlock(&memprof.l);
return;
}
if(memprof.used >= nelem(memprof.buckets)){
memprof.lost++;
unlock(&memprof.l);
return;
}
p = &memprof.buckets[memprof.used++];
p->val = pc;
p->pool = pool;
p->count = 1;
p->size = size;
p->next = *h0;
*h0 = p;
unlock(&memprof.l);
}
static void
_memmonitor(int pool, ulong pc, ulong base, ulong size)
{
Pevent e;
e.pool = pool;
e.pc = pc;
e.base = base;
e.size = size;
lock(&poolevents.l);
if(!poolevents.full){
poolevents.events[poolevents.wr] = e;
if(++poolevents.wr == nelem(poolevents.events))
poolevents.wr = 0;
if(poolevents.wr == poolevents.rd)
poolevents.full = 1;
}else
poolevents.lost++;
if(poolevents.want){
poolevents.want = 0;
Wakeup(&poolevents.r);
}
unlock(&poolevents.l);
}
static int
ismemdata(void *v)
{
USED(v);
return poolevents.full || poolevents.rd != poolevents.wr;
}
static char*
memaudit(int pno, Bhdr *b)
{
Pstate *p;
if(pno >= Npool)
return "too many pools for memaudit";
if((p = poolstate[pno].ptr) == poolstate[pno].lim){
if(b->magic == MAGIC_E)
return nil;
p = &poolstate[pno].state[1];
if(b->magic == MAGIC_F)
p++;
p->base++;
p->size += b->size;
return nil;
}
poolstate[pno].ptr++;
p->base = (ulong)b;
p->size = b->size;
switch(b->magic){
case MAGIC_A:
p->size |= Palloc;
break;
case MAGIC_F:
p->size |= Pfree;
break;
case MAGIC_E:
p->size = b->csize | Paend;
break;
case MAGIC_I:
p->size |= Pimmutable;
break;
default:
return "bad magic number in block";
}
return nil;
}
static void
mput4(uchar *m, ulong v)
{
m[0] = v>>24;
m[1] = v>>16;
m[2] = v>>8;
m[3] = v;
}
static Chan*
memattach(char *spec)
{
return devattach('%', spec);
}
static Walkqid*
memwalk(Chan *c, Chan *nc, char **name, int nname)
{
return devwalk(c, nc, name, nname, memdir, nelem(memdir), devgen);
}
static int
memstat(Chan *c, uchar *db, int n)
{
return devstat(c, db, n, memdir, nelem(memdir), devgen);
}
static Chan*
memopen(Chan *c, int omode)
{
if(memmonitor != nil && c->qid.path != Qgc)
error(Einuse);
c = devopen(c, omode, memdir, nelem(memdir), devgen);
switch((ulong)c->qid.path){
case Qevent:
if(incref(&poolevents.inuse) != 1){
decref(&poolevents.inuse);
c->flag &= ~COPEN;
error(Einuse);
}
poolevents.rd = poolevents.wr = 0;
poolevents.full = 0;
poolevents.want = 0;
poolevents.lost = 0;
memmonitor = _memmonitor;
poolevents.open = 1;
break;
case Qstate:
if(incref(&stateopen) != 1){
decref(&stateopen);
c->flag &= ~COPEN;
error(Einuse);
}
break;
case Qprof:
if(incref(&memprof.inuse) != 1){
decref(&memprof.inuse);
c->flag &= ~COPEN;
error(Einuse);
}
memmonitor = mprofmonitor;
break;
}
return c;
}
static void
memclose(Chan *c)
{
if((c->flag & COPEN) == 0)
return;
switch((ulong)c->qid.path) {
case Qevent:
memmonitor = nil;
poolevents.open = 0;
decref(&poolevents.inuse);
break;
case Qstate:
decref(&stateopen);
break;
case Qprof:
decref(&memprof.inuse);
memmonitor = nil;
break;
}
}
static long
memread(Chan *c, void *va, long count, vlong offset)
{
uchar *m;
char *e, *s;
int i, summary;
long n, nr;
Pstate *p;
Pevent pe;
Pbucket *b;
if(c->qid.type & QTDIR)
return devdirread(c, va, count, memdir, nelem(memdir), devgen);
summary = 0;
switch((ulong)c->qid.path) {
default:
error(Egreg);
case Qctl:
return 0;
case Qsum:
summary = 1;
/* fall through */
case Qstate:
if(offset == 0){
for(i=0; i<Npool; i++){
poolstate[i].ptr = &poolstate[i].state[3];
poolstate[i].lim = poolstate[i].ptr + Nstate;
memset(poolstate[i].state, 0, sizeof(poolstate[i].state));
poolstate[i].summary = summary;
}
e = poolaudit(memaudit);
if(e != nil){
print("mem: %s\n", e);
error(e);
}
}
m = va;
nr = offset/8;
for(i=0; i<Npool && count >= 8; i++){
n = poolstate[i].ptr - poolstate[i].state;
poolstate[i].state[0].base = i;
poolstate[i].state[0].size = n;
if(nr >= n){
nr -= n;
continue;
}
n -= nr;
p = &poolstate[i].state[nr];
for(; --n >= 0 && (count -= 8) >= 0; m += 8, p++){
mput4(m, p->base);
mput4(m+4, p->size);
}
}
return m-(uchar*)va;
case Qevent:
while(!ismemdata(nil)){
poolevents.want = 1;
Sleep(&poolevents.r, ismemdata, nil);
}
m = va;
do{
if((count -= 4*4) < 0)
return m-(uchar*)va;
pe = poolevents.events[poolevents.rd];
mput4(m, pe.pool);
mput4(m+4, pe.pc);
mput4(m+8, pe.base);
mput4(m+12, pe.size);
m += 4*4;
if(++poolevents.rd >= nelem(poolevents.events))
poolevents.rd = 0;
}while(poolevents.rd != poolevents.wr);
poolevents.full = 0;
return m-(uchar*)va;
case Qprof:
if(offset == 0){
lock(&memprof.l);
memmove(memprof.snap, memprof.buckets, memprof.used*sizeof(memprof.buckets[0]));
memprof.snapped = memprof.used;
unlock(&memprof.l);
}
m = va;
for(i = offset/(4*4); i < memprof.snapped && (count -= 4*4) >= 0; i++){
b = &memprof.snap[i];
mput4(m, b->pool);
mput4(m+4, b->val);
mput4(m+8, b->count);
mput4(m+12, b->size);
m += 4*4;
}
return m-(uchar*)va;
case Qgc:
s = malloc(READSTR);
if(s == nil)
error(Enomem);
if(waserror()){
free(s);
nexterror();
}
snprint(s, READSTR, "runs: %lud\nsweeps: %lud\nbchain: %lud\nhalted: %lud\nepochs: %lud\ndestroy: %llud\ninspects: %llud\nbusy: %llud\nidle: %llud\nidlepass: %llud\npartial: %llud\n",
gcnruns, gcsweeps, gcbroken, gchalted, gcepochs, gcdestroys, gcinspects, gcbusy, gcidle, gcidlepass, gcpartial);
count = readstr(offset, va, count, s);
poperror();
free(s);
return count;
}
}
static long
memwrite(Chan *c, void *va, long count, vlong offset)
{
USED(offset);
USED(count);
USED(va);
if(c->qid.type & QTDIR)
error(Eperm);
switch((ulong)c->qid.path) {
default:
error(Egreg);
case Qctl:
error(Ebadarg);
case Qstate:
error(Eperm);
case Qprof:
mprofreset();
break;
}
return 0;
}
Dev memdevtab = {
'%',
"mem",
devinit,
memattach,
memwalk,
memstat,
memopen,
devcreate,
memclose,
memread,
devbread,
memwrite,
devbwrite,
devremove,
devwstat
};