From: Lai Jiangshan Date: Mon, 28 Nov 2011 13:26:28 +0000 (-0500) Subject: move memory management code out as rculfhash-mm-order.c X-Git-Tag: v0.7.0~43^2~37 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=0b6aa0018b42d0b101c617ef6c6d34d0f4dd2258;p=userspace-rcu.git move memory management code out as rculfhash-mm-order.c Signed-off-by: Lai Jiangshan Signed-off-by: Mathieu Desnoyers --- diff --git a/Makefile.am b/Makefile.am index 1290551..4d3f7bd 100644 --- a/Makefile.am +++ b/Makefile.am @@ -22,6 +22,7 @@ EXTRA_DIST = $(top_srcdir)/urcu/arch/*.h $(top_srcdir)/urcu/uatomic/*.h \ gpl-2.0.txt lgpl-2.1.txt lgpl-relicensing.txt \ README LICENSE compat_arch_x86.c \ urcu-call-rcu-impl.h urcu-defer-impl.h \ + rculfhash-internal.h \ ChangeLog API.txt if COMPAT_ARCH @@ -34,6 +35,8 @@ if COMPAT_FUTEX COMPAT+=compat_futex.c endif +RCULFHASH=rculfhash.c rculfhash-mm-order.c + lib_LTLIBRARIES = liburcu-common.la \ liburcu.la liburcu-qsbr.la \ liburcu-mb.la liburcu-signal.la liburcu-bp.la \ @@ -62,7 +65,7 @@ liburcu_signal_la_LIBADD = liburcu-common.la liburcu_bp_la_SOURCES = urcu-bp.c urcu-pointer.c $(COMPAT) liburcu_bp_la_LIBADD = liburcu-common.la -liburcu_cds_la_SOURCES = rculfqueue.c rculfstack.c rculfhash.c $(COMPAT) +liburcu_cds_la_SOURCES = rculfqueue.c rculfstack.c $(RCULFHASH) $(COMPAT) liburcu_cds_la_LIBADD = liburcu-common.la pkgconfigdir = $(libdir)/pkgconfig diff --git a/rculfhash-internal.h b/rculfhash-internal.h new file mode 100644 index 0000000..820e62c --- /dev/null +++ b/rculfhash-internal.h @@ -0,0 +1,115 @@ +#ifndef _URCU_RCULFHASH_INTERNAL_H +#define _URCU_RCULFHASH_INTERNAL_H + +/* + * urcu/rculfhash-internal.h + * + * Internal header for Lock-Free RCU Hash Table + * + * Copyright 2011 - Mathieu Desnoyers + * Copyright 2011 - Lai Jiangshan + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include + +#ifdef DEBUG +#define dbg_printf(fmt, args...) printf("[debug rculfhash] " fmt, ## args) +#else +#define dbg_printf(fmt, args...) +#endif + +#if (CAA_BITS_PER_LONG == 32) +#define MAX_TABLE_ORDER 32 +#else +#define MAX_TABLE_ORDER 64 +#endif + +#ifndef min +#define min(a, b) ((a) < (b) ? (a) : (b)) +#endif + +#ifndef max +#define max(a, b) ((a) > (b) ? (a) : (b)) +#endif + +struct ht_items_count; + +/* + * cds_lfht: Top-level data structure representing a lock-free hash + * table. Defined in the implementation file to make it be an opaque + * cookie to users. + */ +struct cds_lfht { + unsigned long size; /* always a power of 2, shared (RCU) */ + int flags; + + /* + * We need to put the work threads offline (QSBR) when taking this + * mutex, because we use synchronize_rcu within this mutex critical + * section, which waits on read-side critical sections, and could + * therefore cause grace-period deadlock if we hold off RCU G.P. + * completion. + */ + pthread_mutex_t resize_mutex; /* resize mutex: add/del mutex */ + pthread_attr_t *resize_attr; /* Resize threads attributes */ + unsigned int in_progress_resize, in_progress_destroy; + unsigned long resize_target; + int resize_initiated; + const struct rcu_flavor_struct *flavor; + + long count; /* global approximate item count */ + struct ht_items_count *split_count; /* split item count */ + + /* memory management related fields are located at the end */ + const struct cds_lfht_mm_type *mm; + + unsigned long min_alloc_buckets_order; + unsigned long min_nr_alloc_buckets; + unsigned long max_nr_buckets; + + struct cds_lfht_node *(*bucket_at)(struct cds_lfht *ht, + unsigned long index); + + union { + /* + * Contains the per order-index-level bucket node table. + * The size of each bucket node table is half the number + * of hashes contained in this order (except for order 0). + * The minimum allocation buckets size parameter allows + * combining the bucket node arrays of the lowermost + * levels to improve cache locality for small index orders. + */ + struct cds_lfht_node *tbl_order[MAX_TABLE_ORDER]; + }; +}; + +extern unsigned int fls_ulong(unsigned long x); +extern int get_count_order_ulong(unsigned long x); + +#ifdef POISON_FREE +#define poison_free(ptr) \ + do { \ + if (ptr) { \ + memset(ptr, 0x42, sizeof(*(ptr))); \ + free(ptr); \ + } \ + } while (0) +#else +#define poison_free(ptr) free(ptr) +#endif + +#endif /* _URCU_RCULFHASH_INTERNAL_H */ diff --git a/rculfhash-mm-order.c b/rculfhash-mm-order.c new file mode 100644 index 0000000..69e2b62 --- /dev/null +++ b/rculfhash-mm-order.c @@ -0,0 +1,101 @@ +/* + * rculfhash-mm-order.c + * + * Order based memory management for Lock-Free RCU Hash Table + * + * Copyright 2011 - Mathieu Desnoyers + * Copyright 2011 - Lai Jiangshan + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include + +static +void cds_lfht_alloc_bucket_table(struct cds_lfht *ht, unsigned long order) +{ + if (order == 0) { + ht->tbl_order[0] = calloc(ht->min_nr_alloc_buckets, + sizeof(struct cds_lfht_node)); + assert(ht->tbl_order[0]); + } else if (order > ht->min_alloc_buckets_order) { + ht->tbl_order[order] = calloc(1UL << (order -1), + sizeof(struct cds_lfht_node)); + assert(ht->tbl_order[order]); + } + /* Nothing to do for 0 < order && order <= ht->min_alloc_buckets_order */ +} + +/* + * cds_lfht_free_bucket_table() should be called with decreasing order. + * When cds_lfht_free_bucket_table(0) is called, it means the whole + * lfht is destroyed. + */ +static +void cds_lfht_free_bucket_table(struct cds_lfht *ht, unsigned long order) +{ + if (order == 0) + poison_free(ht->tbl_order[0]); + else if (order > ht->min_alloc_buckets_order) + poison_free(ht->tbl_order[order]); + /* Nothing to do for 0 < order && order <= ht->min_alloc_buckets_order */ +} + +static +struct cds_lfht_node *bucket_at(struct cds_lfht *ht, unsigned long index) +{ + unsigned long order; + + if (index < ht->min_nr_alloc_buckets) { + dbg_printf("bucket index %lu order 0 aridx 0\n", index); + return &ht->tbl_order[0][index]; + } + /* + * equivalent to get_count_order_ulong(index + 1), but optimizes + * away the non-existing 0 special-case for + * get_count_order_ulong. + */ + order = fls_ulong(index); + dbg_printf("bucket index %lu order %lu aridx %lu\n", + index, order, index & ((1UL << (order - 1)) - 1)); + return &ht->tbl_order[order][index & ((1UL << (order - 1)) - 1)]; +} + +static +struct cds_lfht *alloc_cds_lfht(unsigned long min_nr_alloc_buckets, + unsigned long max_nr_buckets) +{ + struct cds_lfht *ht; + + ht = calloc(1, sizeof(struct cds_lfht)); + assert(ht); + + ht->mm = &cds_lfht_mm_order; + + ht->min_nr_alloc_buckets = min_nr_alloc_buckets; + ht->min_alloc_buckets_order = get_count_order_ulong(min_nr_alloc_buckets); + ht->max_nr_buckets = max_nr_buckets; + + ht->bucket_at = bucket_at; + + return ht; +} + +const struct cds_lfht_mm_type cds_lfht_mm_order = { + .alloc_cds_lfht = alloc_cds_lfht, + .alloc_bucket_table = cds_lfht_alloc_bucket_table, + .free_bucket_table = cds_lfht_free_bucket_table, + .bucket_at = bucket_at, +}; diff --git a/rculfhash.c b/rculfhash.c index 8dc9c59..49c7863 100644 --- a/rculfhash.c +++ b/rculfhash.c @@ -165,15 +165,10 @@ #include #include #include +#include #include #include -#ifdef DEBUG -#define dbg_printf(fmt, args...) printf("[debug rculfhash] " fmt, ## args) -#else -#define dbg_printf(fmt, args...) -#endif - /* * Split-counters lazily update the global counter each 1024 * addition/removal. It automatically keeps track of resize required. @@ -191,26 +186,12 @@ #define MIN_TABLE_ORDER 0 #define MIN_TABLE_SIZE (1UL << MIN_TABLE_ORDER) -#if (CAA_BITS_PER_LONG == 32) -#define MAX_TABLE_ORDER 32 -#else -#define MAX_TABLE_ORDER 64 -#endif - /* * Minimum number of bucket nodes to touch per thread to parallelize grow/shrink. */ #define MIN_PARTITION_PER_THREAD_ORDER 12 #define MIN_PARTITION_PER_THREAD (1UL << MIN_PARTITION_PER_THREAD_ORDER) -#ifndef min -#define min(a, b) ((a) < (b) ? (a) : (b)) -#endif - -#ifndef max -#define max(a, b) ((a) > (b) ? (a) : (b)) -#endif - /* * The removed flag needs to be updated atomically with the pointer. * It indicates that no node must attach to the node scheduled for @@ -239,45 +220,6 @@ struct ht_items_count { unsigned long add, del; } __attribute__((aligned(CAA_CACHE_LINE_SIZE))); -/* - * cds_lfht: Top-level data structure representing a lock-free hash - * table. Defined in the implementation file to make it be an opaque - * cookie to users. - */ -struct cds_lfht { - unsigned long size; /* always a power of 2, shared (RCU) */ - int flags; - - /* - * We need to put the work threads offline (QSBR) when taking this - * mutex, because we use synchronize_rcu within this mutex critical - * section, which waits on read-side critical sections, and could - * therefore cause grace-period deadlock if we hold off RCU G.P. - * completion. - */ - pthread_mutex_t resize_mutex; /* resize mutex: add/del mutex */ - pthread_attr_t *resize_attr; /* Resize threads attributes */ - unsigned int in_progress_resize, in_progress_destroy; - unsigned long resize_target; - int resize_initiated; - const struct rcu_flavor_struct *flavor; - - long count; /* global approximate item count */ - struct ht_items_count *split_count; /* split item count */ - - unsigned long min_alloc_buckets_order; - unsigned long min_nr_alloc_buckets; - unsigned long max_nr_buckets; - /* - * Contains the per order-index-level bucket node table. The size - * of each bucket node table is half the number of hashes contained - * in this order (except for order 0). The minimum allocation size - * parameter allows combining the bucket node arrays of the lowermost - * levels to improve cache locality for small index orders. - */ - struct cds_lfht_node *tbl[MAX_TABLE_ORDER]; -}; - /* * rcu_resize_work: Contains arguments passed to RCU worker thread * responsible for performing lazy resize. @@ -505,18 +447,6 @@ int get_count_order_ulong(unsigned long x) return fls_ulong(x - 1); } -#ifdef POISON_FREE -#define poison_free(ptr) \ - do { \ - if (ptr) { \ - memset(ptr, 0x42, sizeof(*(ptr))); \ - free(ptr); \ - } \ - } while (0) -#else -#define poison_free(ptr) free(ptr) -#endif - static void cds_lfht_resize_lazy_grow(struct cds_lfht *ht, unsigned long size, int growth); @@ -743,16 +673,7 @@ unsigned long _uatomic_xchg_monotonic_increase(unsigned long *ptr, static void cds_lfht_alloc_bucket_table(struct cds_lfht *ht, unsigned long order) { - if (order == 0) { - ht->tbl[0] = calloc(ht->min_nr_alloc_buckets, - sizeof(struct cds_lfht_node)); - assert(ht->tbl[0]); - } else if (order > ht->min_alloc_buckets_order) { - ht->tbl[order] = calloc(1UL << (order -1), - sizeof(struct cds_lfht_node)); - assert(ht->tbl[order]); - } - /* Nothing to do for 0 < order && order <= ht->min_alloc_buckets_order */ + return ht->mm->alloc_bucket_table(ht, order); } /* @@ -763,32 +684,13 @@ void cds_lfht_alloc_bucket_table(struct cds_lfht *ht, unsigned long order) static void cds_lfht_free_bucket_table(struct cds_lfht *ht, unsigned long order) { - if (order == 0) - poison_free(ht->tbl[0]); - else if (order > ht->min_alloc_buckets_order) - poison_free(ht->tbl[order]); - /* Nothing to do for 0 < order && order <= ht->min_alloc_buckets_order */ + return ht->mm->free_bucket_table(ht, order); } static inline struct cds_lfht_node *bucket_at(struct cds_lfht *ht, unsigned long index) { - unsigned long order; - - if ((__builtin_constant_p(index) && index == 0) - || index < ht->min_nr_alloc_buckets) { - dbg_printf("bucket index %lu order 0 aridx 0\n", index); - return &ht->tbl[0][index]; - } - /* - * equivalent to get_count_order_ulong(index + 1), but optimizes - * away the non-existing 0 special-case for - * get_count_order_ulong. - */ - order = fls_ulong(index); - dbg_printf("bucket index %lu order %lu aridx %lu\n", - index, order, index & ((1UL << (order - 1)) - 1)); - return &ht->tbl[order][index & ((1UL << (order - 1)) - 1)]; + return ht->bucket_at(ht, index); } static inline @@ -1354,6 +1256,7 @@ struct cds_lfht *_cds_lfht_new(unsigned long init_size, unsigned long min_nr_alloc_buckets, unsigned long max_nr_buckets, int flags, + const struct cds_lfht_mm_type *mm, const struct rcu_flavor_struct *flavor, pthread_attr_t *attr) { @@ -1368,7 +1271,8 @@ struct cds_lfht *_cds_lfht_new(unsigned long init_size, if (!init_size || (init_size & (init_size - 1))) return NULL; - if (!max_nr_buckets) + /* max_nr_buckets == 0 for order based mm means infinite */ + if (mm == &cds_lfht_mm_order && !max_nr_buckets) max_nr_buckets = 1UL << (MAX_TABLE_ORDER - 1); /* max_nr_buckets must be power of two */ @@ -1379,8 +1283,12 @@ struct cds_lfht *_cds_lfht_new(unsigned long init_size, init_size = max(init_size, MIN_TABLE_SIZE); max_nr_buckets = max(max_nr_buckets, min_nr_alloc_buckets); init_size = min(init_size, max_nr_buckets); - ht = calloc(1, sizeof(struct cds_lfht)); + + ht = mm->alloc_cds_lfht(min_nr_alloc_buckets, max_nr_buckets); assert(ht); + assert(ht->mm == mm); + assert(ht->bucket_at == mm->bucket_at); + ht->flags = flags; ht->flavor = flavor; ht->resize_attr = attr; @@ -1389,9 +1297,6 @@ struct cds_lfht *_cds_lfht_new(unsigned long init_size, pthread_mutex_init(&ht->resize_mutex, NULL); order = get_count_order_ulong(init_size); ht->resize_target = 1UL << order; - ht->min_nr_alloc_buckets = min_nr_alloc_buckets; - ht->min_alloc_buckets_order = get_count_order_ulong(min_nr_alloc_buckets); - ht->max_nr_buckets = max_nr_buckets; cds_lfht_create_bucket(ht, 1UL << order); ht->size = 1UL << order; return ht; diff --git a/urcu/rculfhash.h b/urcu/rculfhash.h index 7b9c5e4..c03baf4 100644 --- a/urcu/rculfhash.h +++ b/urcu/rculfhash.h @@ -95,6 +95,17 @@ enum { CDS_LFHT_ACCOUNTING = (1U << 1), }; +struct cds_lfht_mm_type { + struct cds_lfht *(*alloc_cds_lfht)(unsigned long min_nr_alloc_buckets, + unsigned long max_nr_buckets); + void (*alloc_bucket_table)(struct cds_lfht *ht, unsigned long order); + void (*free_bucket_table)(struct cds_lfht *ht, unsigned long order); + struct cds_lfht_node *(*bucket_at)(struct cds_lfht *ht, + unsigned long index); +}; + +extern const struct cds_lfht_mm_type cds_lfht_mm_order; + /* * _cds_lfht_new - API used by cds_lfht_new wrapper. Do not use directly. */ @@ -102,6 +113,7 @@ struct cds_lfht *_cds_lfht_new(unsigned long init_size, unsigned long min_nr_alloc_buckets, unsigned long max_nr_buckets, int flags, + const struct cds_lfht_mm_type *mm, const struct rcu_flavor_struct *flavor, pthread_attr_t *attr); @@ -140,7 +152,7 @@ struct cds_lfht *cds_lfht_new(unsigned long init_size, pthread_attr_t *attr) { return _cds_lfht_new(init_size, min_nr_alloc_buckets, max_nr_buckets, - flags, &rcu_flavor, attr); + flags, &cds_lfht_mm_order, &rcu_flavor, attr); } /*