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https://github.com/memtest86plus/memtest86plus.git
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e92f488753
Use a more efficient algorithm that can be in-lined, and keep the generator state in a local variable.
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2020-2022 Martin Whitaker.
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//
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// Partly derived from an extract of memtest86+ test.c:
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//
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// MemTest86+ V5 Specific code (GPL V2.0)
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// By Samuel DEMEULEMEESTER, sdemeule@memtest.org
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// http://www.canardpc.com - http://www.memtest.org
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// Thanks to Passmark for calculate_chunk() and various comments !
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// ----------------------------------------------------
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// test.c - MemTest-86 Version 3.4
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//
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// Released under version 2 of the Gnu Public License.
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// By Chris Brady
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#include <stdint.h>
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#include "cache.h"
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#include "smp.h"
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#include "barrier.h"
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#include "config.h"
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#include "display.h"
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#include "test_helper.h"
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//------------------------------------------------------------------------------
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// Public Functions
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//------------------------------------------------------------------------------
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void calculate_chunk(testword_t **start, testword_t **end, int my_cpu, int segment, size_t chunk_align)
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{
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if (my_cpu < 0) {
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my_cpu = 0;
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}
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// If we are only running 1 CPU then test the whole segment.
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if (num_active_cpus == 1) {
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*start = vm_map[segment].start;
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*end = vm_map[segment].end;
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} else {
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uintptr_t segment_size = (vm_map[segment].end - vm_map[segment].start + 1) * sizeof(testword_t);
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uintptr_t chunk_size = round_down(segment_size / num_active_cpus, chunk_align);
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// Calculate chunk boundaries.
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*start = (testword_t *)((uintptr_t)vm_map[segment].start + chunk_size * chunk_index[my_cpu]);
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*end = (testword_t *)((uintptr_t)(*start) + chunk_size) - 1;
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if (*end > vm_map[segment].end) {
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*end = vm_map[segment].end;
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}
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}
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}
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void flush_caches(int my_cpu)
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{
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if (my_cpu >= 0) {
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bool use_spin_wait = (power_save < POWER_SAVE_HIGH);
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if (use_spin_wait) {
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barrier_spin_wait(run_barrier);
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} else {
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barrier_halt_wait(run_barrier);
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}
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if (my_cpu == master_cpu) {
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cache_flush();
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}
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if (use_spin_wait) {
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barrier_spin_wait(run_barrier);
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} else {
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barrier_halt_wait(run_barrier);
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}
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}
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}
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