From patchwork Wed Feb 7 20:31:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: SeongJae Park X-Patchwork-Id: 771699 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 55337129A68; Wed, 7 Feb 2024 20:31:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707337905; cv=none; b=awO4IAA7rrCQJGXGv+rhbdSqduL24SZfTY9EHHeof/iAlJn40jU2JviX8innoJbCh9Vu9Tw5MQKhWmS3Ceql+i08C3ul7ph7W5ml9UJ6zYxmXPHcfVlWmXbmbl2xkZsAm+vQJ9+s1QoJhxEass8L0P8EZf9Rh0ygQCJhH+DqNlY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707337905; c=relaxed/simple; bh=eTfAT8I3Zrsng6f7SuRxQKWrP7lIEivzKE3OpfIwwxI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=NNNZ/v6HpOXAaHXJM3QzUFepWuf/A15ZJo7OyimKO9JELZ03TPL00eWZ+nVp1J+sqOaxyKmllJ3fsQPso9dkFu3+KaNz/CAOiyotME3GfWZF/DDW8THfaW4sWIZm6n3UgVHBVYlL0iPdsssUAWI4G+5qemv5DPXKolLuEiqHk+g= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JKgp/zT8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JKgp/zT8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 374E9C4166D; Wed, 7 Feb 2024 20:31:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1707337904; bh=eTfAT8I3Zrsng6f7SuRxQKWrP7lIEivzKE3OpfIwwxI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JKgp/zT8soGxMNVpEjgN4T11q/PH3dSEMmOCuxrZk1KHb+x4aO+vHKx3WghdJTjjI U1vxJoRUqSA7K4mUYmEwBW/w7cVZ/AzEVXOVi2WJGSqr85PnQHEVDdbCphy53Hiobe ewQwBW7Pj5BnELlzpz1x6bHuaUUXU1pXc7qQN322bFOVRh4Xb0IFrPID3NY1DlUp7b SnTkVHx91YfY8ZxZosB/ENWyTggk4AGpTLXidmrJmcjX6q21CdrSENztmqzzCi4WBs AUnNKvucq+cG0+WD5BN7QIV7fUw/7zlR91K8CILvWsb1THqfz3lx4WtJWh7OFb7FSi 3SpnJ3QJj9rXQ== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , Shuah Khan , damon@lists.linux.dev, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/8] selftests/damon: add a test for DAMOS apply intervals Date: Wed, 7 Feb 2024 12:31:31 -0800 Message-Id: <20240207203134.69976-6-sj@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240207203134.69976-1-sj@kernel.org> References: <20240207203134.69976-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add a selftest for DAMOS apply intervals. It runs two schemes having different apply interval agains an artificial memory access workload, and check if the scheme with smaller apply interval was applied more frequently. Signed-off-by: SeongJae Park --- tools/testing/selftests/damon/Makefile | 2 +- .../selftests/damon/damos_apply_interval.py | 67 +++++++++++++++++++ 2 files changed, 68 insertions(+), 1 deletion(-) create mode 100755 tools/testing/selftests/damon/damos_apply_interval.py diff --git a/tools/testing/selftests/damon/Makefile b/tools/testing/selftests/damon/Makefile index 9c3783f1a39d..b545fedafb3b 100644 --- a/tools/testing/selftests/damon/Makefile +++ b/tools/testing/selftests/damon/Makefile @@ -12,7 +12,7 @@ TEST_PROGS += debugfs_rm_non_contexts.sh TEST_PROGS += sysfs.sh sysfs_update_removed_scheme_dir.sh TEST_PROGS += sysfs_update_schemes_tried_regions_hang.py TEST_PROGS += sysfs_update_schemes_tried_regions_wss_estimation.py -TEST_PROGS += damos_quota.py +TEST_PROGS += damos_quota.py damos_apply_interval.py TEST_PROGS += reclaim.sh lru_sort.sh include ../lib.mk diff --git a/tools/testing/selftests/damon/damos_apply_interval.py b/tools/testing/selftests/damon/damos_apply_interval.py new file mode 100755 index 000000000000..f04d43702481 --- /dev/null +++ b/tools/testing/selftests/damon/damos_apply_interval.py @@ -0,0 +1,67 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0 + +import subprocess +import time + +import _damon_sysfs + +def main(): + # access two 10 MiB memory regions, 2 second per each + sz_region = 10 * 1024 * 1024 + proc = subprocess.Popen(['./access_memory', '2', '%d' % sz_region, '2000']) + + # Set quota up to 1 MiB per 100 ms + kdamonds = _damon_sysfs.Kdamonds([_damon_sysfs.Kdamond( + contexts=[_damon_sysfs.DamonCtx( + ops='vaddr', + targets=[_damon_sysfs.DamonTarget(pid=proc.pid)], + schemes=[ + _damon_sysfs.Damos( + access_pattern=_damon_sysfs.DamosAccessPattern( + # >= 25% access rate, >= 200ms age + nr_accesses=[5, 20], age=[2, 2**64 - 1]), + # aggregation interval (100 ms) is used + apply_interval_us=0), + # use 10ms apply interval + _damon_sysfs.Damos( + access_pattern=_damon_sysfs.DamosAccessPattern( + # >= 25% access rate, >= 200ms age + nr_accesses=[5, 20], age=[2, 2**64 - 1]), + # explicitly set 10 ms apply interval + apply_interval_us=10 * 1000) + ] # schemes + )] # contexts + )]) # kdamonds + + err = kdamonds.start() + if err != None: + print('kdamond start failed: %s' % err) + exit(1) + + wss_collected = [] + nr_quota_exceeds = 0 + while proc.poll() == None: + time.sleep(0.1) + err = kdamonds.kdamonds[0].update_schemes_stats() + if err != None: + print('stats update failed: %s' % err) + exit(1) + schemes = kdamonds.kdamonds[0].contexts[0].schemes + nr_tried_stats = [s.stats.nr_tried for s in schemes] + if nr_tried_stats[0] == 0 or nr_tried_stats[1] == 0: + print('scheme(s) are not tried') + exit(1) + + # Because the second scheme was having the apply interval that is ten times + # lower than that of the first scheme, the second scheme should be tried + # about ten times more frequently than the first scheme. For possible + # timing errors, check if it was at least nine times more freuqnetly tried. + ratio = nr_tried_stats[1] / nr_tried_stats[0] + if ratio < 9: + print('%d / %d = %f (< 9)' % + (nr_tried_stats[1], nr_tried_stats[0], ratio)) + exit(1) + +if __name__ == '__main__': + main()