Use jemalloc as memory allocator on linux.

In comparison to standard glibc allocator,
jemalloc fargments adress space less,
and scales linearly in multithreaded environment.
Author: Jason Evans, mad props to him.

--HG--
branch : trunk

1 files changed, 380 insertions, 0 deletions

diff --git a/dep/include/jemalloc/internal/tcache.h b/dep/include/jemalloc/internal/tcache.h
new file mode 100644
index 00000000000..c76597fafab
--- /dev/null
+++ b/dep/include/jemalloc/internal/tcache.h
@@ -0,0 +1,380 @@
+#ifdef JEMALLOC_TCACHE
+/******************************************************************************/
+#ifdef JEMALLOC_H_TYPES
+
+typedef struct tcache_bin_s tcache_bin_t;
+typedef struct tcache_s tcache_t;
+
+/*
+ * Absolute maximum number of cache slots for each small bin in the thread
+ * cache.  This is an additional constraint beyond that imposed as: twice the
+ * number of regions per run for this size class.
+ *
+ * This constant must be an even number.
+ */
+#define	TCACHE_NSLOTS_SMALL_MAX		200
+
+/* Number of cache slots for large size classes. */
+#define	TCACHE_NSLOTS_LARGE		20
+
+/* (1U << opt_lg_tcache_maxclass) is used to compute tcache_maxclass. */
+#define	LG_TCACHE_MAXCLASS_DEFAULT	15
+
+/*
+ * (1U << opt_lg_tcache_gc_sweep) is the approximate number of allocation
+ * events between full GC sweeps (-1: disabled).  Integer rounding may cause
+ * the actual number to be slightly higher, since GC is performed
+ * incrementally.
+ */
+#define	LG_TCACHE_GC_SWEEP_DEFAULT	13
+
+#endif /* JEMALLOC_H_TYPES */
+/******************************************************************************/
+#ifdef JEMALLOC_H_STRUCTS
+
+struct tcache_bin_s {
+#  ifdef JEMALLOC_STATS
+	tcache_bin_stats_t tstats;
+#  endif
+	unsigned	low_water;	/* Min # cached since last GC. */
+	unsigned	high_water;	/* Max # cached since last GC. */
+	unsigned	ncached;	/* # of cached objects. */
+	unsigned	ncached_max;	/* Upper limit on ncached. */
+	void		*avail;		/* Chain of available objects. */
+};
+
+struct tcache_s {
+#  ifdef JEMALLOC_STATS
+	ql_elm(tcache_t) link;		/* Used for aggregating stats. */
+#  endif
+#  ifdef JEMALLOC_PROF
+	uint64_t	prof_accumbytes;/* Cleared after arena_prof_accum() */
+#  endif
+	arena_t		*arena;		/* This thread's arena. */
+	unsigned	ev_cnt;		/* Event count since incremental GC. */
+	unsigned	next_gc_bin;	/* Next bin to GC. */
+	tcache_bin_t	tbins[1];	/* Dynamically sized. */
+};
+
+#endif /* JEMALLOC_H_STRUCTS */
+/******************************************************************************/
+#ifdef JEMALLOC_H_EXTERNS
+
+extern bool	opt_tcache;
+extern ssize_t	opt_lg_tcache_maxclass;
+extern ssize_t	opt_lg_tcache_gc_sweep;
+
+/* Map of thread-specific caches. */
+extern __thread tcache_t	*tcache_tls
+    JEMALLOC_ATTR(tls_model("initial-exec"));
+
+/*
+ * Number of tcache bins.  There are nbins small-object bins, plus 0 or more
+ * large-object bins.
+ */
+extern size_t			nhbins;
+
+/* Maximum cached size class. */
+extern size_t			tcache_maxclass;
+
+/* Number of tcache allocation/deallocation events between incremental GCs. */
+extern unsigned			tcache_gc_incr;
+
+void	tcache_bin_flush_small(tcache_bin_t *tbin, size_t binind, unsigned rem
+#if (defined(JEMALLOC_STATS) || defined(JEMALLOC_PROF))
+    , tcache_t *tcache
+#endif
+    );
+void	tcache_bin_flush_large(tcache_bin_t *tbin, size_t binind, unsigned rem
+#if (defined(JEMALLOC_STATS) || defined(JEMALLOC_PROF))
+    , tcache_t *tcache
+#endif
+    );
+tcache_t *tcache_create(arena_t *arena);
+void	*tcache_alloc_small_hard(tcache_t *tcache, tcache_bin_t *tbin,
+    size_t binind);
+void	tcache_destroy(tcache_t *tcache);
+#ifdef JEMALLOC_STATS
+void	tcache_stats_merge(tcache_t *tcache, arena_t *arena);
+#endif
+void	tcache_boot(void);
+
+#endif /* JEMALLOC_H_EXTERNS */
+/******************************************************************************/
+#ifdef JEMALLOC_H_INLINES
+
+#ifndef JEMALLOC_ENABLE_INLINE
+void	tcache_event(tcache_t *tcache);
+tcache_t *tcache_get(void);
+void	*tcache_alloc_easy(tcache_bin_t *tbin);
+void	*tcache_alloc_small(tcache_t *tcache, size_t size, bool zero);
+void	*tcache_alloc_large(tcache_t *tcache, size_t size, bool zero);
+void	tcache_dalloc_small(tcache_t *tcache, void *ptr);
+void	tcache_dalloc_large(tcache_t *tcache, void *ptr, size_t size);
+#endif
+
+#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_TCACHE_C_))
+JEMALLOC_INLINE tcache_t *
+tcache_get(void)
+{
+	tcache_t *tcache;
+
+	if ((isthreaded & opt_tcache) == false)
+		return (NULL);
+
+	tcache = tcache_tls;
+	if ((uintptr_t)tcache <= (uintptr_t)1) {
+		if (tcache == NULL) {
+			tcache = tcache_create(choose_arena());
+			if (tcache == NULL)
+				return (NULL);
+		} else
+			return (NULL);
+	}
+
+	return (tcache);
+}
+
+JEMALLOC_INLINE void
+tcache_event(tcache_t *tcache)
+{
+
+	if (tcache_gc_incr == 0)
+		return;
+
+	tcache->ev_cnt++;
+	assert(tcache->ev_cnt <= tcache_gc_incr);
+	if (tcache->ev_cnt == tcache_gc_incr) {
+		size_t binind = tcache->next_gc_bin;
+		tcache_bin_t *tbin = &tcache->tbins[binind];
+
+		if (tbin->low_water > 0) {
+			/*
+			 * Flush (ceiling) 3/4 of the objects below the low
+			 * water mark.
+			 */
+			if (binind < nbins) {
+				tcache_bin_flush_small(tbin, binind,
+				    tbin->ncached - tbin->low_water +
+				    (tbin->low_water >> 2)
+#if (defined(JEMALLOC_STATS) || defined(JEMALLOC_PROF))
+				    , tcache
+#endif
+				    );
+			} else {
+				tcache_bin_flush_large(tbin, binind,
+				    tbin->ncached - tbin->low_water +
+				    (tbin->low_water >> 2)
+#if (defined(JEMALLOC_STATS) || defined(JEMALLOC_PROF))
+				    , tcache
+#endif
+				    );
+			}
+		}
+		tbin->low_water = tbin->ncached;
+		tbin->high_water = tbin->ncached;
+
+		tcache->next_gc_bin++;
+		if (tcache->next_gc_bin == nhbins)
+			tcache->next_gc_bin = 0;
+		tcache->ev_cnt = 0;
+	}
+}
+
+JEMALLOC_INLINE void *
+tcache_alloc_easy(tcache_bin_t *tbin)
+{
+	void *ret;
+
+	if (tbin->ncached == 0)
+		return (NULL);
+	tbin->ncached--;
+	if (tbin->ncached < tbin->low_water)
+		tbin->low_water = tbin->ncached;
+	ret = tbin->avail;
+	tbin->avail = *(void **)ret;
+	return (ret);
+}
+
+JEMALLOC_INLINE void *
+tcache_alloc_small(tcache_t *tcache, size_t size, bool zero)
+{
+	void *ret;
+	size_t binind;
+	tcache_bin_t *tbin;
+
+	binind = small_size2bin[size];
+	assert(binind < nbins);
+	tbin = &tcache->tbins[binind];
+	ret = tcache_alloc_easy(tbin);
+	if (ret == NULL) {
+		ret = tcache_alloc_small_hard(tcache, tbin, binind);
+		if (ret == NULL)
+			return (NULL);
+	}
+	assert(arena_salloc(ret) == tcache->arena->bins[binind].reg_size);
+
+	if (zero == false) {
+#ifdef JEMALLOC_FILL
+		if (opt_junk)
+			memset(ret, 0xa5, size);
+		else if (opt_zero)
+			memset(ret, 0, size);
+#endif
+	} else
+		memset(ret, 0, size);
+
+#ifdef JEMALLOC_STATS
+	tbin->tstats.nrequests++;
+#endif
+#ifdef JEMALLOC_PROF
+	tcache->prof_accumbytes += tcache->arena->bins[binind].reg_size;
+#endif
+	tcache_event(tcache);
+	return (ret);
+}
+
+JEMALLOC_INLINE void *
+tcache_alloc_large(tcache_t *tcache, size_t size, bool zero)
+{
+	void *ret;
+	size_t binind;
+	tcache_bin_t *tbin;
+
+	size = PAGE_CEILING(size);
+	assert(size <= tcache_maxclass);
+	binind = nbins + (size >> PAGE_SHIFT) - 1;
+	assert(binind < nhbins);
+	tbin = &tcache->tbins[binind];
+	ret = tcache_alloc_easy(tbin);
+	if (ret == NULL) {
+		/*
+		 * Only allocate one large object at a time, because it's quite
+		 * expensive to create one and not use it.
+		 */
+		ret = arena_malloc_large(tcache->arena, size, zero);
+		if (ret == NULL)
+			return (NULL);
+	} else {
+#ifdef JEMALLOC_PROF
+		arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ret);
+		size_t pageind = (unsigned)(((uintptr_t)ret - (uintptr_t)chunk)
+		    >> PAGE_SHIFT);
+		chunk->map[pageind].bits |= CHUNK_MAP_CLASS_MASK;
+#endif
+		if (zero == false) {
+#ifdef JEMALLOC_FILL
+			if (opt_junk)
+				memset(ret, 0xa5, size);
+			else if (opt_zero)
+				memset(ret, 0, size);
+#endif
+		} else
+			memset(ret, 0, size);
+
+#ifdef JEMALLOC_STATS
+		tbin->tstats.nrequests++;
+#endif
+#ifdef JEMALLOC_PROF
+		tcache->prof_accumbytes += size;
+#endif
+	}
+
+	tcache_event(tcache);
+	return (ret);
+}
+
+JEMALLOC_INLINE void
+tcache_dalloc_small(tcache_t *tcache, void *ptr)
+{
+	arena_t *arena;
+	arena_chunk_t *chunk;
+	arena_run_t *run;
+	arena_bin_t *bin;
+	tcache_bin_t *tbin;
+	size_t pageind, binind;
+	arena_chunk_map_t *mapelm;
+
+	assert(arena_salloc(ptr) <= small_maxclass);
+
+	chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
+	arena = chunk->arena;
+	pageind = (((uintptr_t)ptr - (uintptr_t)chunk) >> PAGE_SHIFT);
+	mapelm = &chunk->map[pageind];
+	run = (arena_run_t *)((uintptr_t)chunk + (uintptr_t)((pageind -
+	    (mapelm->bits >> PAGE_SHIFT)) << PAGE_SHIFT));
+	assert(run->magic == ARENA_RUN_MAGIC);
+	bin = run->bin;
+	binind = ((uintptr_t)bin - (uintptr_t)&arena->bins) /
+	    sizeof(arena_bin_t);
+	assert(binind < nbins);
+
+#ifdef JEMALLOC_FILL
+	if (opt_junk)
+		memset(ptr, 0x5a, bin->reg_size);
+#endif
+
+	tbin = &tcache->tbins[binind];
+	if (tbin->ncached == tbin->ncached_max) {
+		tcache_bin_flush_small(tbin, binind, (tbin->ncached_max >> 1)
+#if (defined(JEMALLOC_STATS) || defined(JEMALLOC_PROF))
+		    , tcache
+#endif
+		    );
+	}
+	assert(tbin->ncached < tbin->ncached_max);
+	*(void **)ptr = tbin->avail;
+	tbin->avail = ptr;
+	tbin->ncached++;
+	if (tbin->ncached > tbin->high_water)
+		tbin->high_water = tbin->ncached;
+
+	tcache_event(tcache);
+}
+
+JEMALLOC_INLINE void
+tcache_dalloc_large(tcache_t *tcache, void *ptr, size_t size)
+{
+	arena_t *arena;
+	arena_chunk_t *chunk;
+	size_t pageind, binind;
+	tcache_bin_t *tbin;
+	arena_chunk_map_t *mapelm;
+
+	assert((size & PAGE_MASK) == 0);
+	assert(arena_salloc(ptr) > small_maxclass);
+	assert(arena_salloc(ptr) <= tcache_maxclass);
+
+	chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
+	arena = chunk->arena;
+	pageind = (((uintptr_t)ptr - (uintptr_t)chunk) >> PAGE_SHIFT);
+	mapelm = &chunk->map[pageind];
+	binind = nbins + (size >> PAGE_SHIFT) - 1;
+
+#ifdef JEMALLOC_FILL
+	if (opt_junk)
+		memset(ptr, 0x5a, bin->reg_size);
+#endif
+
+	tbin = &tcache->tbins[binind];
+	if (tbin->ncached == tbin->ncached_max) {
+		tcache_bin_flush_large(tbin, binind, (tbin->ncached_max >> 1)
+#if (defined(JEMALLOC_STATS) || defined(JEMALLOC_PROF))
+		    , tcache
+#endif
+		    );
+	}
+	assert(tbin->ncached < tbin->ncached_max);
+	*(void **)ptr = tbin->avail;
+	tbin->avail = ptr;
+	tbin->ncached++;
+	if (tbin->ncached > tbin->high_water)
+		tbin->high_water = tbin->ncached;
+
+	tcache_event(tcache);
+}
+#endif
+
+#endif /* JEMALLOC_H_INLINES */
+/******************************************************************************/
+#endif /* JEMALLOC_TCACHE */