Date: Wed, 05 Feb 2003 05:10:33 +0100 From: Dag-Erling Smorgrav <des@ofug.org> To: arch@freebsd.org Subject: New kernel allocation API Message-ID: <xzp8ywvs6yu.fsf@flood.ping.uio.no>
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--=-=-=
The attached patch creates two new entry points for malloc(), named
kalloc() and kalloc_nowait(), eliminating the need for the M_NOWAIT
and M_TRYWAIT constants. The patch also defines malloc() as a macro
which invokes the appropriate API function, so source-level
compatibility is maintained.
DES
--
Dag-Erling Smorgrav - des@ofug.org
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Content-Type: text/x-patch
Content-Disposition: attachment; filename=kalloc.diff
Index: sys/sys/malloc.h
===================================================================
RCS file: /home/ncvs/src/sys/sys/malloc.h,v
retrieving revision 1.69
diff -u -r1.69 malloc.h
--- sys/sys/malloc.h 21 Jan 2003 08:56:14 -0000 1.69
+++ sys/sys/malloc.h 5 Feb 2003 04:05:14 -0000
@@ -107,7 +107,8 @@
unsigned long low, unsigned long high, unsigned long alignment,
unsigned long boundary);
void free(void *addr, struct malloc_type *type);
-void *malloc(unsigned long size, struct malloc_type *type, int flags);
+void *kalloc(size_t n, struct malloc_type *t, int z, struct mtx *m);
+void *kalloc_nowait(size_t n, struct malloc_type *t, int z);
void malloc_init(void *);
int malloc_last_fail(void);
void malloc_uninit(void *);
@@ -115,6 +116,13 @@
int flags);
void *reallocf(void *addr, unsigned long size, struct malloc_type *type,
int flags);
+/*
+ * Legacy API.
+ */
+#define malloc(sz, mt, fl) (((fl) & M_NOWAIT) ? \
+ kalloc_nowait((sz), (mt), ((fl) & M_ZERO)) : \
+ kalloc((sz), (mt), ((fl) & M_ZERO), NULL))
+
#endif /* _KERNEL */
#endif /* !_SYS_MALLOC_H_ */
Index: sys/kern/kern_malloc.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/kern_malloc.c,v
retrieving revision 1.115
diff -u -r1.115 kern_malloc.c
--- sys/kern/kern_malloc.c 1 Feb 2003 10:07:49 -0000 1.115
+++ sys/kern/kern_malloc.c 5 Feb 2003 04:09:05 -0000
@@ -153,6 +153,9 @@
* If M_NOWAIT is set, this routine will not block and return NULL if
* the allocation fails.
*/
+#ifdef malloc
+#undef malloc
+#endif
void *
malloc(size, type, flags)
unsigned long size;
@@ -216,6 +219,43 @@
}
#endif
return ((void *) va);
+}
+
+/*
+ * Allocates size bytes, blocking if the request can't be satisfied right
+ * away. If mtx is non-NULL it may be released during kalloc(), and will
+ * be re-acquired before returning. If zero is non-zero, the allocated
+ * memory is cleared before kalloc() returns.
+ */
+void *
+kalloc(size_t size, struct malloc_type *type, int zero, struct mtx *mtx)
+{
+ int flags;
+ void *va;
+
+ KASSERT(curthread->td_intr_nesting_level == 0,
+ ("kalloc() called in interrupt context"));
+ flags = zero ? 0 : M_ZERO;
+ mtx_unlock(mtx);
+ va = malloc(size, type, flags);
+ mtx_lock(mtx);
+ return (va);
+}
+
+/*
+ * Attempts to allocate size bytes, and returns NULL if the request can't
+ * be satisfied right away. If zero is non-zero, the allocated memory is
+ * cleared before kalloc_nowait() returns.
+ */
+void *
+kalloc_nowait(size_t size, struct malloc_type *type, int zero)
+{
+ int flags;
+ void *va;
+
+ flags = M_NOWAIT | (zero ? 0 : M_ZERO);
+ va = malloc(size, type, flags);
+ return (va);
}
/*
--=-=-=--
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