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authorMole Shang <[email protected]>2024-01-18 17:35:27 +0800
committerMole Shang <[email protected]>2024-02-05 18:10:56 +0800
commit283d5ab4c964ab525e45fcade06d6fd7e977c43e (patch)
treebc44a1e2c447fb965cf5d5c2cfdcfa71658dbbbf /kernel/kalloc.c
parent0d6a64fa06ce6aae729fa05a539eadd88fa59007 (diff)
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lab syscall: finish
Conflicts: kernel/syscall.c kernel/syscall.h user/user.h user/usys.pl
Diffstat (limited to 'kernel/kalloc.c')
-rw-r--r--kernel/kalloc.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/kalloc.c b/kernel/kalloc.c
index 0699e7e..c2fdb86 100644
--- a/kernel/kalloc.c
+++ b/kernel/kalloc.c
@@ -80,3 +80,17 @@ kalloc(void)
memset((char*)r, 5, PGSIZE); // fill with junk
return (void*)r;
}
+
+int
+get_freemem(void)
+{
+ int n;
+ struct run *r;
+
+ acquire(&kmem.lock);
+ for (n = 0, r = kmem.freelist; r; r = r->next)
+ n++;
+ release(&kmem.lock);
+
+ return n * PGSIZE;
+}