Imbus/xv6-riscv-kernel
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no more big kernel lock

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succeeds at usertests.c pipe test
This commit is contained in:
rtm 2006-07-12 01:48:35 +00:00
parent b41b38d0da
commit 4e8f237be8
15 changed files with 202 additions and 95 deletions
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19
kalloc.c
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@ -10,6 +10,9 @@
#include "param.h"
#include "types.h"
#include "defs.h"
#include "spinlock.h"
struct spinlock kalloc_lock;
struct run {
struct run *next;
@ -54,6 +57,8 @@ kfree(char *cp, int len)
for(i = 0; i < len; i++)
cp[i] = 1;
acquire(&kalloc_lock);
rr = &freelist;
while(*rr){
struct run *rend = (struct run *) ((char *)(*rr) + (*rr)->len);
@ -63,13 +68,13 @@ kfree(char *cp, int len)
p->len = len + (*rr)->len;
p->next = (*rr)->next;
*rr = p;
return;
goto out;
}
if(pend < *rr){
p->len = len;
p->next = *rr;
*rr = p;
return;
goto out;
}
if(p == rend){
(*rr)->len += len;
@ -77,13 +82,16 @@ kfree(char *cp, int len)
(*rr)->len += (*rr)->next->len;
(*rr)->next = (*rr)->next->next;
}
return;
goto out;
}
rr = &((*rr)->next);
}
p->len = len;
p->next = 0;
*rr = p;
out:
release(&kalloc_lock);
}
/*
@ -99,20 +107,25 @@ kalloc(int n)
if(n % PAGE)
panic("kalloc");
acquire(&kalloc_lock);
rr = &freelist;
while(*rr){
struct run *r = *rr;
if(r->len == n){
*rr = r->next;
release(&kalloc_lock);
return (char *) r;
}
if(r->len > n){
char *p = (char *)r + (r->len - n);
r->len -= n;
release(&kalloc_lock);
return p;
}
rr = &(*rr)->next;
}
release(&kalloc_lock);
return 0;
}