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diff --git a/storage/tokudb/PerconaFT/portability/toku_time.h b/storage/tokudb/PerconaFT/portability/toku_time.h
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+++ b/storage/tokudb/PerconaFT/portability/toku_time.h
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+/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
+#ident "$Id$"
+/*======
+This file is part of PerconaFT.
+
+
+Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.
+
+    PerconaFT is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License, version 2,
+    as published by the Free Software Foundation.
+
+    PerconaFT 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.
+
+----------------------------------------
+
+    PerconaFT is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License, version 3,
+    as published by the Free Software Foundation.
+
+    PerconaFT 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.
+
+----------------------------------------
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+======= */
+
+#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."
+
+#pragma once
+
+#include "toku_config.h"
+
+#include <time.h>
+#include <sys/time.h>
+#include <stdint.h>
+#if defined(__powerpc__)
+# include <sys/platform/ppc.h>
+#endif
+
+static inline float toku_tdiff (struct timeval *a, struct timeval *b) {
+    return (float)((a->tv_sec - b->tv_sec) + 1e-6 * (a->tv_usec - b->tv_usec));
+}
+
+#if !defined(HAVE_CLOCK_REALTIME)
+// OS X does not have clock_gettime, we fake clockid_t for the interface, and we'll implement it with clock_get_time.
+typedef int clockid_t;
+// just something bogus, it doesn't matter, we just want to make sure we're
+// only supporting this mode because we're not sure we can support other modes
+// without a real clock_gettime()
+#define CLOCK_REALTIME 0x01867234
+#endif
+int toku_clock_gettime(clockid_t clk_id, struct timespec *ts) __attribute__((__visibility__("default")));
+
+// *************** Performance timers ************************
+// What do you really want from a performance timer:
+//  (1) Can determine actual time of day from the performance time.
+//  (2) Time goes forward, never backward.
+//  (3) Same time on different processors (or even different machines).
+//  (4) Time goes forward at a constant rate (doesn't get faster and slower)
+//  (5) Portable.
+//  (6) Getting the time is cheap.
+// Unfortuately it seems tough to get Properties 1-5.  So we go for Property 6,, but we abstract it.
+// We offer a type tokutime_t which can hold the time.
+// This type can be subtracted to get a time difference.
+// We can get the present time cheaply.
+// We can convert this type to seconds (but that can be expensive).
+// The implementation is to use RDTSC (hence we lose property 3: not portable).
+// Recent machines have constant_tsc in which case we get property (4).
+// Recent OSs on recent machines (that have RDTSCP) fix the per-processor clock skew, so we get property (3).
+// We get property 2 with RDTSC (as long as there's not any skew).
+// We don't even try to get propety 1, since we don't need it.
+// The decision here is that these times are really accurate only on modern machines with modern OSs.
+typedef uint64_t tokutime_t;             // Time type used in by tokutek timers.
+
+// The value of tokutime_t is not specified here. 
+// It might be microseconds since 1/1/1970 (if gettimeofday() is
+// used), or clock cycles since boot (if rdtsc is used).  Or something
+// else.
+// Two tokutime_t values can be subtracted to get a time difference.
+// Use tokutime_to_seconds to that convert difference  to seconds.
+// We want get_tokutime() to be fast, but don't care so much about tokutime_to_seconds();
+//
+// For accurate time calculations do the subtraction in the right order:
+//   Right:  tokutime_to_seconds(t1-t2);
+//   Wrong   tokutime_to_seconds(t1)-toku_time_to_seconds(t2);
+// Doing it the wrong way is likely to result in loss of precision.
+// A double can hold numbers up to about 53 bits.  RDTSC which uses about 33 bits every second, so that leaves
+// 2^20 seconds from booting (about 2 weeks) before the RDTSC value cannot be represented accurately as a double.
+//
+double tokutime_to_seconds(tokutime_t)  __attribute__((__visibility__("default"))); // Convert tokutime to seconds.
+
+// Get the value of tokutime for right now.  We want this to be fast, so we expose the implementation as RDTSC.
+static inline tokutime_t toku_time_now(void) {
+#if defined(__x86_64__) || defined(__i386__)
+    uint32_t lo, hi;
+    __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
+    return (uint64_t)hi << 32 | lo;
+#elif defined (__aarch64__)
+    uint64_t result;
+    __asm __volatile__ ("mrs %[rt], cntvct_el0" : [rt] "=r" (result));
+    return result;
+#elif defined(__powerpc__)
+    return __ppc_get_timebase();
+#else
+#error No timer implementation for this platform
+#endif
+}
+
+static inline uint64_t toku_current_time_microsec(void) {
+    struct timeval t;
+    gettimeofday(&t, NULL);
+    return t.tv_sec * (1UL * 1000 * 1000) + t.tv_usec;
+}
+
+// sleep microseconds
+static inline void toku_sleep_microsec(uint64_t ms) {
+    struct timeval  t;
+
+    t.tv_sec = ms / 1000000;
+    t.tv_usec = ms % 1000000;
+
+    select(0, NULL, NULL, NULL, &t);
+}