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Mon, 22 Jun 2026 11:00:38 +0800 From: Yi Sun To: CC: , <279644543@qq.com>, , , , , , , , , , , , Subject: [PATCH v7 1/2] lib: bitmap: add tests for bitmap_find_next_zero_area_off() Date: Mon, 22 Jun 2026 11:00:35 +0800 Message-ID: <20260622030036.1744080-2-yi.sun@unisoc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260622030036.1744080-1-yi.sun@unisoc.com> References: <20260622030036.1744080-1-yi.sun@unisoc.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SHCAS03.spreadtrum.com (10.0.1.207) To BJMBX02.spreadtrum.com (10.0.64.8) X-MAIL:SHSQR01.spreadtrum.com 65M30f3x067406 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=unisoc.com; s=default; t=1782097266; bh=hI3PZ+pukAD3MV/c0m7vak3ak8i/aOa5kxgdPHkyGXQ=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=l1It9TnHlhNlNkXC7PhfGQnytAYvPCuR8ySjF9dR5LxXDFhPro+/flw4P5L8JQ1EH Jg78oKVLO19dHkazEBorXA0Jm41I7arZFmJYtWSLZRRqG+CBsjXn2p1RPRUtnBElyu bhsGwLmCcchG1KwWWr2IB6I79+BqtOax/+ywdzLx9PZqoweh85NAva7WJms+Ca88pb eLBadqmNeGwDYQagVHI8BBV/1Sd1cN6mCHfALydWvIB2SLxkI2DXVGoBlxWjn8RHtN dNY/22UyMHw1T4LMUyHCgdjacCNtTM6taaul8mFi4WeYBAcWJLpPdW67yVo2Z2q9ae 8FrWkbCkRzCPw== Add functional and performance tests for bitmap_find_next_zero_area_off(). performance tests partial output: Start testing find_bit() with random-filled bitmap [ 0.310073] bitmap_find_next_zero_area_off: 852731 ns, 1154 iterations [ 0.311435] find_next_bit: 1356654 ns, 163975 iterations Start testing find_bit() with sparse bitmap [ 0.316267] bitmap_find_next_zero_area_off:4426808 ns, 322479 iterations [ 0.316292] find_next_bit: 15154 ns, 656 iterations Signed-off-by: Yi Sun --- lib/find_bit_benchmark.c | 17 +++++++++++++++++ lib/test_bitmap.c | 38 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 55 insertions(+) diff --git a/lib/find_bit_benchmark.c b/lib/find_bit_benchmark.c index 00d9dc61cd46..05305e655f99 100644 --- a/lib/find_bit_benchmark.c +++ b/lib/find_bit_benchmark.c @@ -149,6 +149,21 @@ static int __init test_find_next_and_bit(const void *bitmap, return 0; } +static int __init +test_bitmap_find_next_zero_area_off(unsigned long *bitmap, unsigned long len) +{ + unsigned long i, cnt; + ktime_t time; + + time = ktime_get(); + for (cnt = i = 0; i < BITMAP_LEN; cnt++) + i = bitmap_find_next_zero_area_off(bitmap, BITMAP_LEN, i, 8, 0, 0) + 1; + time = ktime_get() - time; + pr_err("bitmap_find_next_zero_area_off:%7llu ns, %6ld iterations\n", time, cnt); + + return 0; +} + static int __init find_bit_test(void) { unsigned long nbits = BITMAP_LEN / SPARSE; @@ -158,6 +173,7 @@ static int __init find_bit_test(void) get_random_bytes(bitmap, sizeof(bitmap)); get_random_bytes(bitmap2, sizeof(bitmap2)); + test_bitmap_find_next_zero_area_off(bitmap, BITMAP_LEN); test_find_next_bit(bitmap, BITMAP_LEN); test_find_next_zero_bit(bitmap, BITMAP_LEN); test_find_last_bit(bitmap, BITMAP_LEN); @@ -181,6 +197,7 @@ static int __init find_bit_test(void) __set_bit(get_random_u32_below(BITMAP_LEN), bitmap2); } + test_bitmap_find_next_zero_area_off(bitmap, BITMAP_LEN); test_find_next_bit(bitmap, BITMAP_LEN); test_find_next_zero_bit(bitmap, BITMAP_LEN); test_find_last_bit(bitmap, BITMAP_LEN); diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c index 69813c10e6c0..8665df77c960 100644 --- a/lib/test_bitmap.c +++ b/lib/test_bitmap.c @@ -234,6 +234,43 @@ static void __init test_find_nth_bit(void) } } +static void __init +test_bitmap_find_next_zero_area_off(void) +{ + DECLARE_BITMAP(bmap, 192); + + bitmap_set(bmap, 0, 192); + + bitmap_clear(bmap, 0, 8); + __clear_bit(50, bmap); + bitmap_clear(bmap, 60, 18); + __set_bit(69, bmap); + __clear_bit(80, bmap); + bitmap_clear(bmap, 100, 10); + __clear_bit(120, bmap); + bitmap_clear(bmap, 145, 8); + bitmap_clear(bmap, 160, 32); + + expect_eq_uint(0, + bitmap_find_next_zero_area_off(bmap, 192, 0, 8, 0, 0)); + expect_eq_uint(0, + bitmap_find_next_zero_area_off(bmap, 192, 0, 8, 3, 0)); + expect_eq_uint(163, + bitmap_find_next_zero_area_off(bmap, 192, 0, 8, 3, 1)); + expect_eq_uint(60, + bitmap_find_next_zero_area_off(bmap, 192, 1, 8, 0, 0)); + expect_eq_uint(160, + bitmap_find_next_zero_area_off(bmap, 192, 1, 8, 7, 0)); + expect_eq_uint(60, + bitmap_find_next_zero_area_off(bmap, 192, 1, 8, 7, 4)); + expect_eq_uint(100, + bitmap_find_next_zero_area_off(bmap, 192, 0, 10, 0, 0)); + expect_eq_uint(160, + bitmap_find_next_zero_area_off(bmap, 192, 0, 32, 0, 0)); + expect_eq_uint(1, + !!(bitmap_find_next_zero_area_off(bmap, 192, 0, 33, 0, 0) >= 192)); +} + static void __init test_fill_set(void) { DECLARE_BITMAP(bmap, 1024); @@ -1559,6 +1596,7 @@ static void __init selftest(void) test_for_each_clear_bitrange_from(); test_for_each_set_clump8(); test_for_each_set_bit_wrap(); + test_bitmap_find_next_zero_area_off(); } KSTM_MODULE_LOADERS(test_bitmap); -- 2.34.1