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-rw-r--r--include/sys/metaslab.h13
-rw-r--r--include/sys/metaslab_impl.h108
-rw-r--r--include/sys/zfs_context.h1
-rw-r--r--include/sys/zfs_debug.h17
-rw-r--r--include/sys/zio.h6
5 files changed, 131 insertions, 14 deletions
diff --git a/include/sys/metaslab.h b/include/sys/metaslab.h
index 408f6d333..be271c702 100644
--- a/include/sys/metaslab.h
+++ b/include/sys/metaslab.h
@@ -20,7 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
+ * Copyright (c) 2011, 2016 by Delphix. All rights reserved.
*/
#ifndef _SYS_METASLAB_H
@@ -36,10 +36,12 @@
extern "C" {
#endif
+
typedef struct metaslab_ops {
- uint64_t (*msop_alloc)(metaslab_t *msp, uint64_t size);
+ uint64_t (*msop_alloc)(metaslab_t *, uint64_t);
} metaslab_ops_t;
+
extern metaslab_ops_t *zfs_metaslab_ops;
int metaslab_init(metaslab_group_t *, uint64_t, uint64_t, uint64_t,
@@ -64,13 +66,18 @@ uint64_t metaslab_block_maxsize(metaslab_t *);
#define METASLAB_FASTWRITE 0x20
int metaslab_alloc(spa_t *, metaslab_class_t *, uint64_t,
- blkptr_t *, int, uint64_t, blkptr_t *, int, zio_t *);
+ blkptr_t *, int, uint64_t, blkptr_t *, int, zio_alloc_list_t *, zio_t *);
void metaslab_free(spa_t *, const blkptr_t *, uint64_t, boolean_t);
int metaslab_claim(spa_t *, const blkptr_t *, uint64_t);
void metaslab_check_free(spa_t *, const blkptr_t *);
void metaslab_fastwrite_mark(spa_t *, const blkptr_t *);
void metaslab_fastwrite_unmark(spa_t *, const blkptr_t *);
+void metaslab_alloc_trace_init(void);
+void metaslab_alloc_trace_fini(void);
+void metaslab_trace_init(zio_alloc_list_t *);
+void metaslab_trace_fini(zio_alloc_list_t *);
+
metaslab_class_t *metaslab_class_create(spa_t *, metaslab_ops_t *);
void metaslab_class_destroy(metaslab_class_t *);
int metaslab_class_validate(metaslab_class_t *);
diff --git a/include/sys/metaslab_impl.h b/include/sys/metaslab_impl.h
index 080a1db9a..7b68b51f6 100644
--- a/include/sys/metaslab_impl.h
+++ b/include/sys/metaslab_impl.h
@@ -24,7 +24,7 @@
*/
/*
- * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
+ * Copyright (c) 2011, 2016 by Delphix. All rights reserved.
*/
#ifndef _SYS_METASLAB_IMPL_H
@@ -42,6 +42,94 @@ extern "C" {
#endif
/*
+ * Metaslab allocation tracing record.
+ */
+typedef struct metaslab_alloc_trace {
+ list_node_t mat_list_node;
+ metaslab_group_t *mat_mg;
+ metaslab_t *mat_msp;
+ uint64_t mat_size;
+ uint64_t mat_weight;
+ uint32_t mat_dva_id;
+ uint64_t mat_offset;
+} metaslab_alloc_trace_t;
+
+/*
+ * Used by the metaslab allocation tracing facility to indicate
+ * error conditions. These errors are stored to the offset member
+ * of the metaslab_alloc_trace_t record and displayed by mdb.
+ */
+typedef enum trace_alloc_type {
+ TRACE_ALLOC_FAILURE = -1ULL,
+ TRACE_TOO_SMALL = -2ULL,
+ TRACE_FORCE_GANG = -3ULL,
+ TRACE_NOT_ALLOCATABLE = -4ULL,
+ TRACE_GROUP_FAILURE = -5ULL,
+ TRACE_ENOSPC = -6ULL,
+ TRACE_CONDENSING = -7ULL,
+ TRACE_VDEV_ERROR = -8ULL
+} trace_alloc_type_t;
+
+#define METASLAB_WEIGHT_PRIMARY (1ULL << 63)
+#define METASLAB_WEIGHT_SECONDARY (1ULL << 62)
+#define METASLAB_WEIGHT_TYPE (1ULL << 61)
+#define METASLAB_ACTIVE_MASK \
+ (METASLAB_WEIGHT_PRIMARY | METASLAB_WEIGHT_SECONDARY)
+
+/*
+ * The metaslab weight is used to encode the amount of free space in a
+ * metaslab, such that the "best" metaslab appears first when sorting the
+ * metaslabs by weight. The weight (and therefore the "best" metaslab) can
+ * be determined in two different ways: by computing a weighted sum of all
+ * the free space in the metaslab (a space based weight) or by counting only
+ * the free segments of the largest size (a segment based weight). We prefer
+ * the segment based weight because it reflects how the free space is
+ * comprised, but we cannot always use it -- legacy pools do not have the
+ * space map histogram information necessary to determine the largest
+ * contiguous regions. Pools that have the space map histogram determine
+ * the segment weight by looking at each bucket in the histogram and
+ * determining the free space whose size in bytes is in the range:
+ * [2^i, 2^(i+1))
+ * We then encode the largest index, i, that contains regions into the
+ * segment-weighted value.
+ *
+ * Space-based weight:
+ *
+ * 64 56 48 40 32 24 16 8 0
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |PS1| weighted-free space |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * PS - indicates primary and secondary activation
+ * space - the fragmentation-weighted space
+ *
+ * Segment-based weight:
+ *
+ * 64 56 48 40 32 24 16 8 0
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |PS0| idx| count of segments in region |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * PS - indicates primary and secondary activation
+ * idx - index for the highest bucket in the histogram
+ * count - number of segments in the specified bucket
+ */
+#define WEIGHT_GET_ACTIVE(weight) BF64_GET((weight), 62, 2)
+#define WEIGHT_SET_ACTIVE(weight, x) BF64_SET((weight), 62, 2, x)
+
+#define WEIGHT_IS_SPACEBASED(weight) \
+ ((weight) == 0 || BF64_GET((weight), 61, 1))
+#define WEIGHT_SET_SPACEBASED(weight) BF64_SET((weight), 61, 1, 1)
+
+/*
+ * These macros are only applicable to segment-based weighting.
+ */
+#define WEIGHT_GET_INDEX(weight) BF64_GET((weight), 55, 6)
+#define WEIGHT_SET_INDEX(weight, x) BF64_SET((weight), 55, 6, x)
+#define WEIGHT_GET_COUNT(weight) BF64_GET((weight), 0, 55)
+#define WEIGHT_SET_COUNT(weight, x) BF64_SET((weight), 0, 55, x)
+
+/*
* A metaslab class encompasses a category of allocatable top-level vdevs.
* Each top-level vdev is associated with a metaslab group which defines
* the allocatable region for that vdev. Examples of these categories include
@@ -220,7 +308,6 @@ struct metaslab {
kmutex_t ms_lock;
kcondvar_t ms_load_cv;
space_map_t *ms_sm;
- metaslab_ops_t *ms_ops;
uint64_t ms_id;
uint64_t ms_start;
uint64_t ms_size;
@@ -233,12 +320,27 @@ struct metaslab {
boolean_t ms_condensing; /* condensing? */
boolean_t ms_condense_wanted;
+
+ /*
+ * We must hold both ms_lock and ms_group->mg_lock in order to
+ * modify ms_loaded.
+ */
boolean_t ms_loaded;
boolean_t ms_loading;
int64_t ms_deferspace; /* sum of ms_defermap[] space */
uint64_t ms_weight; /* weight vs. others in group */
- uint64_t ms_access_txg;
+ uint64_t ms_activation_weight; /* activation weight */
+
+ /*
+ * Track of whenever a metaslab is selected for loading or allocation.
+ * We use this value to determine how long the metaslab should
+ * stay cached.
+ */
+ uint64_t ms_selected_txg;
+
+ uint64_t ms_alloc_txg; /* last successful alloc (debug only) */
+ uint64_t ms_max_size; /* maximum allocatable size */
/*
* The metaslab block allocators can optionally use a size-ordered
diff --git a/include/sys/zfs_context.h b/include/sys/zfs_context.h
index a1abe20da..6e950716c 100644
--- a/include/sys/zfs_context.h
+++ b/include/sys/zfs_context.h
@@ -394,6 +394,7 @@ extern void cv_broadcast(kcondvar_t *cv);
*/
extern kstat_t *kstat_create(const char *, int,
const char *, const char *, uchar_t, ulong_t, uchar_t);
+extern void kstat_named_init(kstat_named_t *, const char *, uchar_t);
extern void kstat_install(kstat_t *);
extern void kstat_delete(kstat_t *);
extern void kstat_waitq_enter(kstat_io_t *);
diff --git a/include/sys/zfs_debug.h b/include/sys/zfs_debug.h
index 2f0064ee0..a2f61e5b2 100644
--- a/include/sys/zfs_debug.h
+++ b/include/sys/zfs_debug.h
@@ -42,14 +42,15 @@ extern int zfs_flags;
extern int zfs_recover;
extern int zfs_free_leak_on_eio;
-#define ZFS_DEBUG_DPRINTF (1<<0)
-#define ZFS_DEBUG_DBUF_VERIFY (1<<1)
-#define ZFS_DEBUG_DNODE_VERIFY (1<<2)
-#define ZFS_DEBUG_SNAPNAMES (1<<3)
-#define ZFS_DEBUG_MODIFY (1<<4)
-#define ZFS_DEBUG_SPA (1<<5)
-#define ZFS_DEBUG_ZIO_FREE (1<<6)
-#define ZFS_DEBUG_HISTOGRAM_VERIFY (1<<7)
+#define ZFS_DEBUG_DPRINTF (1 << 0)
+#define ZFS_DEBUG_DBUF_VERIFY (1 << 1)
+#define ZFS_DEBUG_DNODE_VERIFY (1 << 2)
+#define ZFS_DEBUG_SNAPNAMES (1 << 3)
+#define ZFS_DEBUG_MODIFY (1 << 4)
+#define ZFS_DEBUG_SPA (1 << 5)
+#define ZFS_DEBUG_ZIO_FREE (1 << 6)
+#define ZFS_DEBUG_HISTOGRAM_VERIFY (1 << 7)
+#define ZFS_DEBUG_METASLAB_VERIFY (1 << 8)
extern void __dprintf(const char *file, const char *func,
int line, const char *fmt, ...);
diff --git a/include/sys/zio.h b/include/sys/zio.h
index 6c5153dcf..1f8708e5a 100644
--- a/include/sys/zio.h
+++ b/include/sys/zio.h
@@ -358,6 +358,11 @@ typedef int zio_pipe_stage_t(zio_t *zio);
#define ZIO_REEXECUTE_NOW 0x01
#define ZIO_REEXECUTE_SUSPEND 0x02
+typedef struct zio_alloc_list {
+ list_t zal_list;
+ uint64_t zal_size;
+} zio_alloc_list_t;
+
typedef struct zio_link {
zio_t *zl_parent;
zio_t *zl_child;
@@ -417,6 +422,7 @@ struct zio {
avl_node_t io_queue_node;
avl_node_t io_offset_node;
avl_node_t io_alloc_node;
+ zio_alloc_list_t io_alloc_list;
/* Internal pipeline state */
enum zio_flag io_flags;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 17:11:13 +0000