1 files changed, 50 insertions, 0 deletions
diff --git a/deps/jemalloc/include/jemalloc/internal/rtree_tsd.h b/deps/jemalloc/include/jemalloc/internal/rtree_tsd.h
new file mode 100644
index 000000000..562e29297
--- /dev/null
+++ b/deps/jemalloc/include/jemalloc/internal/rtree_tsd.h
@@ -0,0 +1,50 @@
+#ifndef JEMALLOC_INTERNAL_RTREE_CTX_H
+#define JEMALLOC_INTERNAL_RTREE_CTX_H
+
+/*
+ * Number of leafkey/leaf pairs to cache in L1 and L2 level respectively.  Each
+ * entry supports an entire leaf, so the cache hit rate is typically high even
+ * with a small number of entries.  In rare cases extent activity will straddle
+ * the boundary between two leaf nodes.  Furthermore, an arena may use a
+ * combination of dss and mmap.  Note that as memory usage grows past the amount
+ * that this cache can directly cover, the cache will become less effective if
+ * locality of reference is low, but the consequence is merely cache misses
+ * while traversing the tree nodes.
+ *
+ * The L1 direct mapped cache offers consistent and low cost on cache hit.
+ * However collision could affect hit rate negatively.  This is resolved by
+ * combining with a L2 LRU cache, which requires linear search and re-ordering
+ * on access but suffers no collision.  Note that, the cache will itself suffer
+ * cache misses if made overly large, plus the cost of linear search in the LRU
+ * cache.
+ */
+#define RTREE_CTX_LG_NCACHE 4
+#define RTREE_CTX_NCACHE (1 << RTREE_CTX_LG_NCACHE)
+#define RTREE_CTX_NCACHE_L2 8
+
+/*
+ * Zero initializer required for tsd initialization only.  Proper initialization
+ * done via rtree_ctx_data_init().
+ */
+#define RTREE_CTX_ZERO_INITIALIZER {{{0, 0}}, {{0, 0}}}
+
+
+typedef struct rtree_leaf_elm_s rtree_leaf_elm_t;
+
+typedef struct rtree_ctx_cache_elm_s rtree_ctx_cache_elm_t;
+struct rtree_ctx_cache_elm_s {
+	uintptr_t		leafkey;
+	rtree_leaf_elm_t	*leaf;
+};
+
+typedef struct rtree_ctx_s rtree_ctx_t;
+struct rtree_ctx_s {
+	/* Direct mapped cache. */
+	rtree_ctx_cache_elm_t	cache[RTREE_CTX_NCACHE];
+	/* L2 LRU cache. */
+	rtree_ctx_cache_elm_t	l2_cache[RTREE_CTX_NCACHE_L2];
+};
+
+void rtree_ctx_data_init(rtree_ctx_t *ctx);
+
+#endif /* JEMALLOC_INTERNAL_RTREE_CTX_H */