From ec0b5795639fe96883366691e0380eeb0845836b Mon Sep 17 00:00:00 2001
From: David Goldblatt <davidgoldblatt@fb.com>
Date: Mon, 11 May 2020 15:33:23 -0700
Subject: [PATCH] Tcache: Privatize opt_lg_tcache_max default.

---
 include/jemalloc/internal/tcache_types.h | 3 ---
 src/tcache.c                             | 7 ++++++-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/include/jemalloc/internal/tcache_types.h b/include/jemalloc/internal/tcache_types.h
index 0806df9c..c8fd4c3e 100644
--- a/include/jemalloc/internal/tcache_types.h
+++ b/include/jemalloc/internal/tcache_types.h
@@ -17,9 +17,6 @@ typedef struct tcaches_s tcaches_t;
 #define TCACHE_STATE_PURGATORY		((tcache_t *)(uintptr_t)3)
 #define TCACHE_STATE_MAX		TCACHE_STATE_PURGATORY
 
-/* (1U << opt_lg_tcache_max) is used to compute tcache_maxclass. */
-#define LG_TCACHE_MAXCLASS_DEFAULT	15
-
 /* Number of allocation bytes between tcache incremental GCs. */
 #define TCACHE_GC_INCR_BYTES 65536U
 
diff --git a/src/tcache.c b/src/tcache.c
index 9586556e..0366149d 100644
--- a/src/tcache.c
+++ b/src/tcache.c
@@ -11,7 +11,12 @@
 /* Data. */
 
 bool opt_tcache = true;
-ssize_t opt_lg_tcache_max = LG_TCACHE_MAXCLASS_DEFAULT;
+
+/*
+ * (1U << opt_lg_tcache_max) is used to compute tcache_maxclass.  This choice
+ * (32kb by default) works well as a default in practice.
+ */
+ssize_t opt_lg_tcache_max = 15;
 
 /* Reasonable defaults for min and max values. */
 unsigned opt_tcache_nslots_small_min = 20;