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f09205b998
In order to quantify demand paging performance, time guest execution during demand paging. Signed-off-by: Ben Gardon <bgardon@google.com> [Move timespec-diff to test_util.h] Signed-off-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* tools/testing/selftests/kvm/lib/test_util.c
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*
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* Copyright (C) 2020, Google LLC.
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*/
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#include <stdlib.h>
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#include <ctype.h>
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#include <limits.h>
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#include "test_util.h"
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/*
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* Parses "[0-9]+[kmgt]?".
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*/
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size_t parse_size(const char *size)
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{
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size_t base;
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char *scale;
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int shift = 0;
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TEST_ASSERT(size && isdigit(size[0]), "Need at least one digit in '%s'", size);
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base = strtoull(size, &scale, 0);
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TEST_ASSERT(base != ULLONG_MAX, "Overflow parsing size!");
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switch (tolower(*scale)) {
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case 't':
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shift = 40;
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break;
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case 'g':
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shift = 30;
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break;
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case 'm':
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shift = 20;
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break;
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case 'k':
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shift = 10;
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break;
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case 'b':
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case '\0':
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shift = 0;
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break;
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default:
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TEST_ASSERT(false, "Unknown size letter %c", *scale);
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}
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TEST_ASSERT((base << shift) >> shift == base, "Overflow scaling size!");
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return base << shift;
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}
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int64_t timespec_to_ns(struct timespec ts)
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{
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return (int64_t)ts.tv_nsec + 1000000000LL * (int64_t)ts.tv_sec;
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}
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struct timespec timespec_diff(struct timespec start, struct timespec end)
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{
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struct timespec temp;
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if ((end.tv_nsec - start.tv_nsec) < 0) {
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temp.tv_sec = end.tv_sec - start.tv_sec - 1;
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temp.tv_nsec = 1000000000LL + end.tv_nsec - start.tv_nsec;
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} else {
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temp.tv_sec = end.tv_sec - start.tv_sec;
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temp.tv_nsec = end.tv_nsec - start.tv_nsec;
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}
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return temp;
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}
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