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Diffstat (limited to 'fs/bcachefs/mean_and_variance_test.c')
| -rw-r--r-- | fs/bcachefs/mean_and_variance_test.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/fs/bcachefs/mean_and_variance_test.c b/fs/bcachefs/mean_and_variance_test.c deleted file mode 100644 index e9d9c0212e44..000000000000 --- a/fs/bcachefs/mean_and_variance_test.c +++ /dev/null @@ -1,221 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -#include <kunit/test.h> - -#include "mean_and_variance.h" - -#define MAX_SQR (SQRT_U64_MAX*SQRT_U64_MAX) - -static void mean_and_variance_basic_test(struct kunit *test) -{ - struct mean_and_variance s = {}; - - mean_and_variance_update(&s, 2); - mean_and_variance_update(&s, 2); - - KUNIT_EXPECT_EQ(test, mean_and_variance_get_mean(s), 2); - KUNIT_EXPECT_EQ(test, mean_and_variance_get_variance(s), 0); - KUNIT_EXPECT_EQ(test, s.n, 2); - - mean_and_variance_update(&s, 4); - mean_and_variance_update(&s, 4); - - KUNIT_EXPECT_EQ(test, mean_and_variance_get_mean(s), 3); - KUNIT_EXPECT_EQ(test, mean_and_variance_get_variance(s), 1); - KUNIT_EXPECT_EQ(test, s.n, 4); -} - -/* - * Test values computed using a spreadsheet from the psuedocode at the bottom: - * https://fanf2.user.srcf.net/hermes/doc/antiforgery/stats.pdf - */ - -static void mean_and_variance_weighted_test(struct kunit *test) -{ - struct mean_and_variance_weighted s = { }; - - mean_and_variance_weighted_update(&s, 10, false, 2); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_mean(s, 2), 10); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_variance(s, 2), 0); - - mean_and_variance_weighted_update(&s, 20, true, 2); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_mean(s, 2), 12); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_variance(s, 2), 18); - - mean_and_variance_weighted_update(&s, 30, true, 2); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_mean(s, 2), 16); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_variance(s, 2), 72); - - s = (struct mean_and_variance_weighted) { }; - - mean_and_variance_weighted_update(&s, -10, false, 2); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_mean(s, 2), -10); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_variance(s, 2), 0); - - mean_and_variance_weighted_update(&s, -20, true, 2); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_mean(s, 2), -12); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_variance(s, 2), 18); - - mean_and_variance_weighted_update(&s, -30, true, 2); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_mean(s, 2), -16); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_variance(s, 2), 72); -} - -static void mean_and_variance_weighted_advanced_test(struct kunit *test) -{ - struct mean_and_variance_weighted s = { }; - bool initted = false; - s64 i; - - for (i = 10; i <= 100; i += 10) { - mean_and_variance_weighted_update(&s, i, initted, 8); - initted = true; - } - - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_mean(s, 8), 11); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_variance(s, 8), 107); - - s = (struct mean_and_variance_weighted) { }; - initted = false; - - for (i = -10; i >= -100; i -= 10) { - mean_and_variance_weighted_update(&s, i, initted, 8); - initted = true; - } - - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_mean(s, 8), -11); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_variance(s, 8), 107); -} - -static void do_mean_and_variance_test(struct kunit *test, - s64 initial_value, - s64 initial_n, - s64 n, - unsigned weight, - s64 *data, - s64 *mean, - s64 *stddev, - s64 *weighted_mean, - s64 *weighted_stddev) -{ - struct mean_and_variance mv = {}; - struct mean_and_variance_weighted vw = { }; - - for (unsigned i = 0; i < initial_n; i++) { - mean_and_variance_update(&mv, initial_value); - mean_and_variance_weighted_update(&vw, initial_value, false, weight); - - KUNIT_EXPECT_EQ(test, mean_and_variance_get_mean(mv), initial_value); - KUNIT_EXPECT_EQ(test, mean_and_variance_get_stddev(mv), 0); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_mean(vw, weight), initial_value); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_stddev(vw, weight),0); - } - - for (unsigned i = 0; i < n; i++) { - mean_and_variance_update(&mv, data[i]); - mean_and_variance_weighted_update(&vw, data[i], true, weight); - - KUNIT_EXPECT_EQ(test, mean_and_variance_get_mean(mv), mean[i]); - KUNIT_EXPECT_EQ(test, mean_and_variance_get_stddev(mv), stddev[i]); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_mean(vw, weight), weighted_mean[i]); - KUNIT_EXPECT_EQ(test, mean_and_variance_weighted_get_stddev(vw, weight),weighted_stddev[i]); - } - - KUNIT_EXPECT_EQ(test, mv.n, initial_n + n); -} - -/* Test behaviour with a single outlier, then back to steady state: */ -static void mean_and_variance_test_1(struct kunit *test) -{ - s64 d[] = { 100, 10, 10, 10, 10, 10, 10 }; - s64 mean[] = { 22, 21, 20, 19, 18, 17, 16 }; - s64 stddev[] = { 32, 29, 28, 27, 26, 25, 24 }; - s64 weighted_mean[] = { 32, 27, 22, 19, 17, 15, 14 }; - s64 weighted_stddev[] = { 38, 35, 31, 27, 24, 21, 18 }; - - do_mean_and_variance_test(test, 10, 6, ARRAY_SIZE(d), 2, - d, mean, stddev, weighted_mean, weighted_stddev); -} - -/* Test behaviour where we switch from one steady state to another: */ -static void mean_and_variance_test_2(struct kunit *test) -{ - s64 d[] = { 100, 100, 100, 100, 100 }; - s64 mean[] = { 22, 32, 40, 46, 50 }; - s64 stddev[] = { 32, 39, 42, 44, 45 }; - s64 weighted_mean[] = { 32, 49, 61, 71, 78 }; - s64 weighted_stddev[] = { 38, 44, 44, 41, 38 }; - - do_mean_and_variance_test(test, 10, 6, ARRAY_SIZE(d), 2, - d, mean, stddev, weighted_mean, weighted_stddev); -} - -static void mean_and_variance_fast_divpow2(struct kunit *test) -{ - s64 i; - u8 d; - - for (i = 0; i < 100; i++) { - d = 0; - KUNIT_EXPECT_EQ(test, fast_divpow2(i, d), div_u64(i, 1LLU << d)); - KUNIT_EXPECT_EQ(test, abs(fast_divpow2(-i, d)), div_u64(i, 1LLU << d)); - for (d = 1; d < 32; d++) { - KUNIT_EXPECT_EQ_MSG(test, abs(fast_divpow2(i, d)), - div_u64(i, 1 << d), "%lld %u", i, d); - KUNIT_EXPECT_EQ_MSG(test, abs(fast_divpow2(-i, d)), - div_u64(i, 1 << d), "%lld %u", -i, d); - } - } -} - -static void mean_and_variance_u128_basic_test(struct kunit *test) -{ - u128_u a = u64s_to_u128(0, U64_MAX); - u128_u a1 = u64s_to_u128(0, 1); - u128_u b = u64s_to_u128(1, 0); - u128_u c = u64s_to_u128(0, 1LLU << 63); - u128_u c2 = u64s_to_u128(U64_MAX, U64_MAX); - - KUNIT_EXPECT_EQ(test, u128_hi(u128_add(a, a1)), 1); - KUNIT_EXPECT_EQ(test, u128_lo(u128_add(a, a1)), 0); - KUNIT_EXPECT_EQ(test, u128_hi(u128_add(a1, a)), 1); - KUNIT_EXPECT_EQ(test, u128_lo(u128_add(a1, a)), 0); - - KUNIT_EXPECT_EQ(test, u128_lo(u128_sub(b, a1)), U64_MAX); - KUNIT_EXPECT_EQ(test, u128_hi(u128_sub(b, a1)), 0); - - KUNIT_EXPECT_EQ(test, u128_hi(u128_shl(c, 1)), 1); - KUNIT_EXPECT_EQ(test, u128_lo(u128_shl(c, 1)), 0); - - KUNIT_EXPECT_EQ(test, u128_hi(u128_square(U64_MAX)), U64_MAX - 1); - KUNIT_EXPECT_EQ(test, u128_lo(u128_square(U64_MAX)), 1); - - KUNIT_EXPECT_EQ(test, u128_lo(u128_div(b, 2)), 1LLU << 63); - - KUNIT_EXPECT_EQ(test, u128_hi(u128_div(c2, 2)), U64_MAX >> 1); - KUNIT_EXPECT_EQ(test, u128_lo(u128_div(c2, 2)), U64_MAX); - - KUNIT_EXPECT_EQ(test, u128_hi(u128_div(u128_shl(u64_to_u128(U64_MAX), 32), 2)), U32_MAX >> 1); - KUNIT_EXPECT_EQ(test, u128_lo(u128_div(u128_shl(u64_to_u128(U64_MAX), 32), 2)), U64_MAX << 31); -} - -static struct kunit_case mean_and_variance_test_cases[] = { - KUNIT_CASE(mean_and_variance_fast_divpow2), - KUNIT_CASE(mean_and_variance_u128_basic_test), - KUNIT_CASE(mean_and_variance_basic_test), - KUNIT_CASE(mean_and_variance_weighted_test), - KUNIT_CASE(mean_and_variance_weighted_advanced_test), - KUNIT_CASE(mean_and_variance_test_1), - KUNIT_CASE(mean_and_variance_test_2), - {} -}; - -static struct kunit_suite mean_and_variance_test_suite = { - .name = "mean and variance tests", - .test_cases = mean_and_variance_test_cases -}; - -kunit_test_suite(mean_and_variance_test_suite); - -MODULE_AUTHOR("Daniel B. Hill"); -MODULE_DESCRIPTION("bcachefs filesystem mean and variance unit tests"); -MODULE_LICENSE("GPL"); |