From 6c80321aed4b620acba4ced1a7a5871377cbc396 Mon Sep 17 00:00:00 2001
From: Jason Evans <jasone@canonware.com>
Date: Sat, 29 Oct 2016 22:55:08 -0700
Subject: [PATCH] Use CLOCK_MONOTONIC_COARSE rather than COARSE_MONOTONIC_RAW.

The raw clock variant is slow (even relative to plain CLOCK_MONOTONIC),
whereas the coarse clock variant is faster than CLOCK_MONOTONIC, but
still has resolution (~1ms) that is adequate for our purposes.

This resolves #479.
---
 configure.ac                                         | 12 ++++++------
 .../jemalloc/internal/jemalloc_internal_defs.h.in    |  4 ++--
 src/nstime.c                                         |  4 ++--
 3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/configure.ac b/configure.ac
index 2dff55b2..b2616b9a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1312,16 +1312,16 @@ if test "x$je_cv_cray_prgenv_wrapper" = "xyes" ; then
   fi
 fi
 
-dnl check for CLOCK_MONOTONIC_RAW (Linux-specific).
-JE_COMPILABLE([clock_gettime(CLOCK_MONOTONIC_RAW, ...)], [
+dnl check for CLOCK_MONOTONIC_COARSE (Linux-specific).
+JE_COMPILABLE([clock_gettime(CLOCK_MONOTONIC_COARSE, ...)], [
 #include <time.h>
 ], [
 	struct timespec ts;
 
-	clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
-], [je_cv_clock_monotonic_raw])
-if test "x${je_cv_clock_monotonic_raw}" = "xyes" ; then
-  AC_DEFINE([JEMALLOC_HAVE_CLOCK_MONOTONIC_RAW])
+	clock_gettime(CLOCK_MONOTONIC_COARSE, &ts);
+], [je_cv_clock_monotonic_coarse])
+if test "x${je_cv_clock_monotonic_coarse}" = "xyes" ; then
+  AC_DEFINE([JEMALLOC_HAVE_CLOCK_MONOTONIC_COARSE])
 fi
 
 dnl check for CLOCK_MONOTONIC.
diff --git a/include/jemalloc/internal/jemalloc_internal_defs.h.in b/include/jemalloc/internal/jemalloc_internal_defs.h.in
index 70b32871..0ba960ba 100644
--- a/include/jemalloc/internal/jemalloc_internal_defs.h.in
+++ b/include/jemalloc/internal/jemalloc_internal_defs.h.in
@@ -77,9 +77,9 @@
 #undef JEMALLOC_HAVE_ISSETUGID
 
 /*
- * Defined if clock_gettime(CLOCK_MONOTONIC_RAW, ...) is available.
+ * Defined if clock_gettime(CLOCK_MONOTONIC_COARSE, ...) is available.
  */
-#undef JEMALLOC_HAVE_CLOCK_MONOTONIC_RAW
+#undef JEMALLOC_HAVE_CLOCK_MONOTONIC_COARSE
 
 /*
  * Defined if clock_gettime(CLOCK_MONOTONIC, ...) is available.
diff --git a/src/nstime.c b/src/nstime.c
index c420c88d..0948e29f 100644
--- a/src/nstime.c
+++ b/src/nstime.c
@@ -110,14 +110,14 @@ nstime_get(nstime_t *time)
 
 	nstime_init(time, ticks_100ns * 100);
 }
-#elif JEMALLOC_HAVE_CLOCK_MONOTONIC_RAW
+#elif JEMALLOC_HAVE_CLOCK_MONOTONIC_COARSE
 #  define NSTIME_MONOTONIC true
 static void
 nstime_get(nstime_t *time)
 {
 	struct timespec ts;
 
-	clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
+	clock_gettime(CLOCK_MONOTONIC_COARSE, &ts);
 	nstime_init2(time, ts.tv_sec, ts.tv_nsec);
 }
 #elif JEMALLOC_HAVE_CLOCK_MONOTONIC