From b38200459f9611c315710c83528614fb244ca719 Mon Sep 17 00:00:00 2001
From: Thomas Snider <tjps636@gmail.com>
Date: Wed, 18 Apr 2018 19:13:10 -0700
Subject: [PATCH] benchmark: Removed bench/perf.cpp

---
 src/Makefile.bench.include |  2 --
 src/bench/bench.cpp        |  4 ---
 src/bench/perf.cpp         | 53 --------------------------------------
 src/bench/perf.h           | 37 --------------------------
 4 files changed, 96 deletions(-)
 delete mode 100644 src/bench/perf.cpp
 delete mode 100644 src/bench/perf.h

diff --git a/src/Makefile.bench.include b/src/Makefile.bench.include
index 748c5b788..3306dcf59 100644
--- a/src/Makefile.bench.include
+++ b/src/Makefile.bench.include
@@ -25,8 +25,6 @@ bench_bench_bitcoin_SOURCES = \
   bench/verify_script.cpp \
   bench/base58.cpp \
   bench/lockedpool.cpp \
-  bench/perf.cpp \
-  bench/perf.h \
   bench/prevector.cpp
 
 nodist_bench_bench_bitcoin_SOURCES = $(GENERATED_BENCH_FILES)
diff --git a/src/bench/bench.cpp b/src/bench/bench.cpp
index 21329a515..de3e57b04 100644
--- a/src/bench/bench.cpp
+++ b/src/bench/bench.cpp
@@ -3,7 +3,6 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <bench/bench.h>
-#include <bench/perf.h>
 
 #include <assert.h>
 #include <iostream>
@@ -96,7 +95,6 @@ benchmark::BenchRunner::BenchRunner(std::string name, benchmark::BenchFunction f
 
 void benchmark::BenchRunner::RunAll(Printer& printer, uint64_t num_evals, double scaling, const std::string& filter, bool is_list_only)
 {
-    perf_init();
     if (!std::ratio_less_equal<benchmark::clock::period, std::micro>::value) {
         std::cerr << "WARNING: Clock precision is worse than microsecond - benchmarks may be less accurate!\n";
     }
@@ -126,8 +124,6 @@ void benchmark::BenchRunner::RunAll(Printer& printer, uint64_t num_evals, double
     }
 
     printer.footer();
-
-    perf_fini();
 }
 
 bool benchmark::State::UpdateTimer(const benchmark::time_point current_time)
diff --git a/src/bench/perf.cpp b/src/bench/perf.cpp
deleted file mode 100644
index f92d08c56..000000000
--- a/src/bench/perf.cpp
+++ /dev/null
@@ -1,53 +0,0 @@
-// Copyright (c) 2016-2017 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-#include <bench/perf.h>
-
-#if defined(__i386__) || defined(__x86_64__)
-
-/* These architectures support querying the cycle counter
- * from user space, no need for any syscall overhead.
- */
-void perf_init(void) { }
-void perf_fini(void) { }
-
-#elif defined(__linux__)
-
-#include <unistd.h>
-#include <sys/syscall.h>
-#include <linux/perf_event.h>
-
-static int fd = -1;
-static struct perf_event_attr attr;
-
-void perf_init(void)
-{
-    attr.type = PERF_TYPE_HARDWARE;
-    attr.config = PERF_COUNT_HW_CPU_CYCLES;
-    fd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0);
-}
-
-void perf_fini(void)
-{
-    if (fd != -1) {
-        close(fd);
-    }
-}
-
-uint64_t perf_cpucycles(void)
-{
-    uint64_t result = 0;
-    if (fd == -1 || read(fd, &result, sizeof(result)) < (ssize_t)sizeof(result)) {
-        return 0;
-    }
-    return result;
-}
-
-#else /* Unhandled platform */
-
-void perf_init(void) { }
-void perf_fini(void) { }
-uint64_t perf_cpucycles(void) { return 0; }
-
-#endif
diff --git a/src/bench/perf.h b/src/bench/perf.h
deleted file mode 100644
index 73ea8b964..000000000
--- a/src/bench/perf.h
+++ /dev/null
@@ -1,37 +0,0 @@
-// Copyright (c) 2016 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-/** Functions for measurement of CPU cycles */
-#ifndef BITCOIN_BENCH_PERF_H
-#define BITCOIN_BENCH_PERF_H
-
-#include <stdint.h>
-
-#if defined(__i386__)
-
-static inline uint64_t perf_cpucycles(void)
-{
-    uint64_t x;
-    __asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));
-    return x;
-}
-
-#elif defined(__x86_64__)
-
-static inline uint64_t perf_cpucycles(void)
-{
-    uint32_t hi, lo;
-    __asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
-    return ((uint64_t)lo)|(((uint64_t)hi)<<32);
-}
-#else
-
-uint64_t perf_cpucycles(void);
-
-#endif
-
-void perf_init(void);
-void perf_fini(void);
-
-#endif // BITCOIN_BENCH_PERF_H