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page: maintain a lru list and do unloading from oldest to newest

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This commit is contained in:
cinap_lenrek 2013-08-03 17:37:20 +02:00
parent 79b16616d7
commit 631ac3d2e2
1 changed files with 30 additions and 5 deletions
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35
sys/src/cmd/page.c
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@ -22,6 +22,9 @@ struct Page {
Page *next;
Page *down;
Page *tail;
Page *lnext;
Page *lprev;
};
int zoom = 1;
@ -32,6 +35,7 @@ int rotate;
int viewgen;
Point resize, pos;
Page *root, *current;
Page lru;
QLock pagelock;
int nullfd;
@ -137,10 +141,6 @@ addpage(Page *up, char *label, int (*popen)(Page *), void *pdata, int fd)
p->open = popen;
p->fd = fd;
p->down = nil;
p->tail = nil;
p->next = nil;
qlock(&pagelock);
if(p->up = up){
if(up->tail == nil)
@ -829,11 +829,30 @@ imagesize(Image *i)
return Dy(i->r)*bytesperline(i->r, i->depth);
}
static void
lunlink(Page *p)
{
if(p->lnext == nil || p->lnext == p)
return;
p->lnext->lprev = p->lprev;
p->lprev->lnext = p->lnext;
p->lnext = nil;
p->lprev = nil;
}
void
loadpage(Page *p)
{
int fd;
qlock(&lru);
lunlink(p);
p->lnext = lru.lnext;
p->lprev = &lru;
p->lnext->lprev = p;
p->lprev->lnext = p;
qunlock(&lru);
if(p->open && p->image == nil){
fd = openpage(p);
if(fd >= 0){
@ -854,6 +873,10 @@ loadpage(Page *p)
void
unloadpage(Page *p)
{
qlock(&lru);
lunlink(p);
qunlock(&lru);
if(p->open == nil || p->image == nil)
return;
lockdisplay(display);
@ -868,7 +891,7 @@ unloadpages(ulong limit)
{
Page *p;
for(p = root->down; p && imemsize >= limit; p = nextpage(p)){
while(imemsize >= limit && (p = lru.lprev) != &lru){
qlock(p);
unloadpage(p);
qunlock(p);
@ -1500,6 +1523,8 @@ main(int argc, char *argv[])
memset(&m, 0, sizeof(m));
if((nullfd = open("/dev/null", ORDWR)) < 0)
sysfatal("open: %r");
lru.lprev = &lru;
lru.lnext = &lru;
current = root = addpage(nil, "", nil, nil, -1);
if(*argv == nil && !imode)
addpage(root, "stdin", popenfile, strdup("/fd/0"), -1);