Update kmem to latest macOS

Fix the memory pressure thread to set the pressure
variable, as well as relax them on timeout (no pressure)

Update abdos.c to actually allocate abd from the expected
cache, so reaping works.

Signed-off-by: Jorgen Lundman <[email protected]>

include/os/windows/spl/sys/debug.h

@@ -91,6 +91,11 @@
 
 #endif
 
+// cdefs.h
+#ifndef	__DECONST
+#define	__DECONST(type, var) ((type)(uintptr_t)(const void *)(var))
+#endif
+
 extern void _Noreturn panic(const char *fmt, ...);
 
 

include/os/windows/spl/sys/kmem.h

@@ -72,7 +72,7 @@ extern uint64_t physmem;
 
 void *zfs_kmem_alloc(size_t size, int kmflags);
 void *zfs_kmem_zalloc(size_t size, int kmflags);
-void zfs_kmem_free(void *buf, size_t size);
+void zfs_kmem_free(const void *buf, size_t size);
 
 void spl_kmem_init(uint64_t);
 void spl_kmem_thread_init();
@@ -128,7 +128,7 @@ kmem_cache_t *kmem_cache_create(char *name, size_t bufsize, size_t align,
     void *_private, struct vmem *vmp, int cflags);
 void kmem_cache_destroy(kmem_cache_t *cache);
 void *kmem_cache_alloc(kmem_cache_t *cache, int flags);
-void kmem_cache_free(kmem_cache_t *cache, void *buf);
+void kmem_cache_free(kmem_cache_t *cache, const void *buf);
 void kmem_cache_free_to_slab(kmem_cache_t *cache, void *buf);
 void kmem_cache_reap_now(kmem_cache_t *cache);
 void kmem_depot_ws_zero(kmem_cache_t *cache);

include/os/windows/spl/sys/kmem_impl.h

@@ -372,6 +372,7 @@ struct kmem_cache {
 	uint64_t cache_bufmax;		/* max buffers ever */
 	uint64_t cache_bufslab;		/* buffers free in slab layer */
 	uint64_t cache_reap;		/* cache reaps */
+	kmutex_t cache_reap_lock;	/* one reap at a time */
 	uint64_t cache_rescale;		/* hash table rescales */
 	uint64_t cache_lookup_depth;	/* hash lookup depth */
 	uint64_t cache_depot_contention; /* mutex contention count */
@@ -464,7 +465,7 @@ typedef struct kmem_log_header {
 	kmutex_t	lh_lock;
 	char		*lh_base;
 	uint32_t	*lh_free;
-	uint32_t	lh_chunksize;
+	size_t		lh_chunksize;
 	uint32_t	lh_nchunks;
 	uint32_t	lh_head;
 	uint32_t	lh_tail;

include/os/windows/spl/sys/seg_kmem.h

@@ -42,6 +42,7 @@ extern "C" {
 extern uint64_t segkmem_total_allocated;
 
 extern vmem_t *abd_arena;
+extern vmem_t *abd_subpage_arena;
 
 /*
  * segkmem page vnodes
@@ -54,7 +55,7 @@ extern vmem_t *abd_arena;
 #endif	/* __sparc */
 
 void *segkmem_alloc(vmem_t *, size_t, int);
-extern void segkmem_free(vmem_t *, void *, size_t);
+extern void segkmem_free(vmem_t *, const void *, size_t);
 extern void kernelheap_init(void);
 extern void kernelheap_fini(void);
 extern void *segkmem_zio_alloc(vmem_t *, size_t, int);

include/os/windows/spl/sys/vmem.h

@@ -125,7 +125,7 @@ struct vmem;
 
 typedef struct vmem vmem_t;
 typedef void *(vmem_alloc_t)(vmem_t *, size_t, int);
-typedef void (vmem_free_t)(vmem_t *, void *, size_t);
+typedef void (vmem_free_t)(vmem_t *, const void *, size_t);
 
 /*
  * Alternate import style; the requested size is passed in a pointer,
@@ -151,8 +151,8 @@ extern void vmem_destroy(vmem_t *);
 extern void *vmem_alloc_impl(vmem_t *, size_t, int);
 extern void *vmem_xalloc(vmem_t *, size_t, size_t, size_t, size_t,
     void *, void *, int);
-extern void vmem_free_impl(vmem_t *, void *, size_t);
-extern void vmem_xfree(vmem_t *, void *, size_t);
+extern void vmem_free_impl(vmem_t *, const void *, size_t);
+extern void vmem_xfree(vmem_t *, const void *, size_t);
 extern void *vmem_add(vmem_t *, void *, size_t, int);
 extern int vmem_contains(vmem_t *, void *, size_t);
 extern void vmem_walk(vmem_t *, int, void (*)(void *, void *, size_t),

include/os/windows/spl/sys/vmem_impl.h

@@ -114,6 +114,8 @@ typedef struct vmem_kstat {
 	kstat_named_t	vk_parent_free;	/* called the source free function */
 	kstat_named_t   vk_threads_waiting; /* threads in cv_wait in vmem */
 	kstat_named_t   vk_excess;	/* count of retained excess imports */
+	kstat_named_t	vk_lowest_stack; /* least remaining stack seen */
+	kstat_named_t	vk_async_stack_calls; /* times allocated off-thread */
 } vmem_kstat_t;
 
 struct vmem {