From nobody Mon Nov 25 08:03:59 2024 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 845EB33E7; Tue, 29 Oct 2024 00:10:52 +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=1730160652; cv=none; b=YaUIaV1B+R0ZGrvGrcCFIkZ0HBSORntuG6cxBkH+/xrmWgVTNVcoNtqT0d+sKuHhpxaxUr9fhSYq005av+D8FMaeJC2x3PL13SNb90LTrdu0hVh5sWKYp2lkirFljIOrKU3yMtcl+7Vk1Ycx7NNBPx63V709BYJl2YnQ0wZM83Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730160652; c=relaxed/simple; bh=+Gi4Oe2ngnG0SL/5UrZCeKSkpi1etLj8XBbfiJB/w3U=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=F8LpINi5fhKCcS7v3+EJtbjgvqQPFHKR5T1igzTq+vHlo7/OP/w/LCdne+NUzknH9BbDFrWtZXVDj6hBzHCRpfOq8OAOPAJlbMjraGuszi+pS8VYOaGOvnfv/cc5jGfbtGbIEiJbPWqT9awsaoDnzRFvXYUX2BNveJPoxotehS8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CJ9zW8eN; 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="CJ9zW8eN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9A5C4C4CEE8; Tue, 29 Oct 2024 00:10:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730160652; bh=+Gi4Oe2ngnG0SL/5UrZCeKSkpi1etLj8XBbfiJB/w3U=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=CJ9zW8eNEl+nbNIdJeSdvQYI5gETvK3MLPsfVBrggNMWzD+D/0g+a9wPhOPXuVXN1 vOqa5Sg2L3ZFcLRVEvLTQdxZ3ElOl6V042nbYOze7t23pzIsWDN8Hyo7M7kGVN5DYM azEx2UZDBuMIg0QYTWjemf+2m7cfZNqm25p1bATsz2zze2frc9wBYjj4RI0D1MmSWd 7K7sIk4b2OfMFNxAsaa0LZPcXKK+Ga8bBzvhYwJ22lxkhKPj61L9NnLrwjPwNru4d8 AbAKbdJj6CYcVgb2AoSM7FM/bV5KiIwm4DHPFz292ZuaN5d+Ck9+ExsLB1HUKWNE3y rFRyp02VHslvQ== From: Mark Brown Date: Tue, 29 Oct 2024 00:10:39 +0000 Subject: [PATCH 1/2] kselftest/arm64: Increase frequency of signal delivery in fp-stress Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241029-arm64-fp-stress-interval-v1-1-db540abf6dd5@kernel.org> References: <20241029-arm64-fp-stress-interval-v1-0-db540abf6dd5@kernel.org> In-Reply-To: <20241029-arm64-fp-stress-interval-v1-0-db540abf6dd5@kernel.org> To: Catalin Marinas , Will Deacon , Shuah Khan Cc: Mark Rutland , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Mark Brown X-Mailer: b4 0.15-dev-9b746 X-Developer-Signature: v=1; a=openpgp-sha256; l=3142; i=broonie@kernel.org; h=from:subject:message-id; bh=+Gi4Oe2ngnG0SL/5UrZCeKSkpi1etLj8XBbfiJB/w3U=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBnICgG5FfJcG+PYxJosmkGnvgsJdS5TbhUu3+17QpS h8kXLwiJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZyAoBgAKCRAk1otyXVSH0PIWB/ 9TUp1BBy1LSk9zADPHE5KWliTKbOohtTTsS5+HTMSnTV7Zdsxh/snxGlm7bWWKVZcZJV7VaaxLdlQS 7k50mDKGRppK5F885f0fP9cTmY2gcw1FbE3R4C03/B7yn6ygbuFmS4fIJpGanM19zSM7AHBEScXjCi 0/niDWI8/suIlWRt7slep6/BuVu78noMlBvsfl2hBC32Sc+Nd2CLfKC7CWr4HuNziuswiYHHhu8cR4 8+DZ0KlZn9GI1HPpZPOjhD875EI3ORHAefhMByr+LsHDOHIefArqigF6jgrREu6z2NhPudHuChIqG/ sMKBWxeTu/QrOQ0RyeUH22fBQVOSCk X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Currently we only deliver signals to the processes being tested about once a second, meaning that the signal code paths are subject to relatively little stress. Increase this frequency substantially to 25ms intervals, along with some minor refactoring to make this more readily tuneable and maintain the 1s logging interval. This interval was chosen based on some experimentation with emulated platforms to avoid causing so much extra load that the test starts to run into the 45s limit for selftests or generally completely disconnect the timeout numbers from the We could increase this if we moved the signal generation out of the main supervisor thread, though we should also consider that he percentage of time that we spend interacting with the floating point state is also a consideration. Suggested-by: Mark Rutland Signed-off-by: Mark Brown --- tools/testing/selftests/arm64/fp/fp-stress.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git a/tools/testing/selftests/arm64/fp/fp-stress.c b/tools/testing/s= elftests/arm64/fp/fp-stress.c index faac24bdefeb9436e2daf20b7250d0ae25ca23a7..c986c68fbcacdd295f4db572770= 75209193cb943 100644 --- a/tools/testing/selftests/arm64/fp/fp-stress.c +++ b/tools/testing/selftests/arm64/fp/fp-stress.c @@ -28,6 +28,9 @@ =20 #define MAX_VLS 16 =20 +#define SIGNAL_INTERVAL_MS 25 +#define LOG_INTERVALS (1000 / SIGNAL_INTERVAL_MS) + struct child_data { char *name, *output; pid_t pid; @@ -449,7 +452,7 @@ static const struct option options[] =3D { int main(int argc, char **argv) { int ret; - int timeout =3D 10; + int timeout =3D 10 * (1000 / SIGNAL_INTERVAL_MS); int cpus, i, j, c; int sve_vl_count, sme_vl_count; bool all_children_started =3D false; @@ -578,14 +581,14 @@ int main(int argc, char **argv) break; =20 /* - * Timeout is counted in seconds with no output, the - * tests print during startup then are silent when - * running so this should ensure they all ran enough - * to install the signal handler, this is especially - * useful in emulation where we will both be slow and - * likely to have a large set of VLs. + * Timeout is counted in poll intervals with no + * output, the tests print during startup then are + * silent when running so this should ensure they all + * ran enough to install the signal handler, this is + * especially useful in emulation where we will both + * be slow and likely to have a large set of VLs. */ - ret =3D epoll_wait(epoll_fd, evs, tests, 1000); + ret =3D epoll_wait(epoll_fd, evs, tests, SIGNAL_INTERVAL_MS); if (ret < 0) { if (errno =3D=3D EINTR) continue; @@ -625,8 +628,9 @@ int main(int argc, char **argv) all_children_started =3D true; } =20 - ksft_print_msg("Sending signals, timeout remaining: %d\n", - timeout); + if ((timeout % LOG_INTERVALS) =3D=3D 0) + ksft_print_msg("Sending signals, timeout remaining: %d\n", + timeout); =20 for (i =3D 0; i < num_children; i++) child_tickle(&children[i]); --=20 2.39.2 From nobody Mon Nov 25 08:03:59 2024 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 92D127464; Tue, 29 Oct 2024 00:10:54 +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=1730160654; cv=none; b=iBOn2fndhOmZQUmejx00adliPX+FI9/ZQRn8nzoCcbOKB0Aj2XhAKMjq1ZuhqMSANa0qW4VIuLE6iwndUEt/8XX+NAZHRi1rtvJ2voE0CFFJ8AkCCL+pq0Ei4l58ykwvRQm/zh5cXlqPQyBsVYh+uUd1yWHwd/v9lEItVSFXUgc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730160654; c=relaxed/simple; bh=ekBfPnwrdm7KummwdeqiAHhMWmmbyTg1NV1XACHkR0Y=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=GAXa2RoQfb3AFCxK/WV+izaGBPGc6rG+fjUD3SzuyR6T3JKmoWBJJGPqyfpt5Si1XvvXA35aOEsT+yIeTFJaCKoRtzdwwBGnHeJLx9pXXaTU7vz0XqRaF7mjshcgTJSJCyfMcOdabsbM2IihuIQbqCY2luounoX5xuyogkTIbm8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NNa9JZJ0; 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="NNa9JZJ0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 967B5C4CEE4; Tue, 29 Oct 2024 00:10:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730160654; bh=ekBfPnwrdm7KummwdeqiAHhMWmmbyTg1NV1XACHkR0Y=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=NNa9JZJ0/NkjQTSMfUdbvmoKVqnMhyf17P8SlyuH/JddEH6fifz8ab+/bCqFF6SJg 7o6r0lgiEa1lghlFPI0lqzB1/EZDLEANhaql43YsGT5Mye2i7MMZNKYH0/UGSXTgZw oTwi67cRPyomFbqJkSMnMp7W/JbgfKWoJiUGi5m8zl3E8nsqN/74J5SUsw65QhGXJd 9tkQPCQFj4RshIGm8M/ETM24z4ORfHsRI7G3pUF0mcDFPFjX/JxkTpnp5UVf3ja06a MsRlXegkTWiHd6De9toOxr6bw9k18y0y3qKpgpQmHIQIdc4TX69sfSDSX+VR2NB96M nZi3D8GU6uc5w== From: Mark Brown Date: Tue, 29 Oct 2024 00:10:40 +0000 Subject: [PATCH 2/2] kselftest/arm64: Lower poll interval while waiting for fp-stress children Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241029-arm64-fp-stress-interval-v1-2-db540abf6dd5@kernel.org> References: <20241029-arm64-fp-stress-interval-v1-0-db540abf6dd5@kernel.org> In-Reply-To: <20241029-arm64-fp-stress-interval-v1-0-db540abf6dd5@kernel.org> To: Catalin Marinas , Will Deacon , Shuah Khan Cc: Mark Rutland , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Mark Brown X-Mailer: b4 0.15-dev-9b746 X-Developer-Signature: v=1; a=openpgp-sha256; l=1959; i=broonie@kernel.org; h=from:subject:message-id; bh=ekBfPnwrdm7KummwdeqiAHhMWmmbyTg1NV1XACHkR0Y=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBnICgHeifBMnCWZ2kSXNB3NMTg0fAwNZRYyu5mcRdL hclJyvCJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZyAoBwAKCRAk1otyXVSH0Iv5B/ wNabZkh1SOPf/oceJvwEmyr/ynlL8MBnpgH8D74hiwWGMZW2822ciE6V4OFPOV7x41bRR2x0/pZ7Hj bWQQTw8qmO2ENaJCt9zsk3NnynS1vO+2xlOCaOIT5bqEk+q6UfvfFvs3QGq+HwY/XRAUFwNhgwI2Km oOhTQ2XxUU7UXJaQVerllbxk3RTZuaUqE8IiXi1vuaZTGnvutlasOgZZ2LyJO+mihb+F/W/d2rEad0 ew2lbo4i9KjaU1T5PVup4NYmVnbeQgGe57bU3BSewpIufI6x4llZT7LccpsdgWsAh5BexwOKdwaQzJ MVPqYlljy03PF2SIqScNn2Ou+DayOx X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB While fp-stress is waiting for children to start it doesn't send any signals to them so there is no need for it to have as short an epoll() timeout as it does when the children are all running. We do still want to have some timeout so that we can log diagnostics about missing children but this can be relatively large. On emulated platforms the overhead of running the supervisor process is quite high, especially during the process of execing the test binaries. Implement a longer epoll() timeout during the setup phase, using a 5s timeout while waiting for children and switching to the signal raise interval when all the children are started and we start sending signals. Signed-off-by: Mark Brown --- tools/testing/selftests/arm64/fp/fp-stress.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/arm64/fp/fp-stress.c b/tools/testing/s= elftests/arm64/fp/fp-stress.c index c986c68fbcacdd295f4db57277075209193cb943..963e2d891ced72fb8d6eff4fdb5= c7df0724b14f1 100644 --- a/tools/testing/selftests/arm64/fp/fp-stress.c +++ b/tools/testing/selftests/arm64/fp/fp-stress.c @@ -453,6 +453,7 @@ int main(int argc, char **argv) { int ret; int timeout =3D 10 * (1000 / SIGNAL_INTERVAL_MS); + int poll_interval =3D 5000; int cpus, i, j, c; int sve_vl_count, sme_vl_count; bool all_children_started =3D false; @@ -588,7 +589,7 @@ int main(int argc, char **argv) * especially useful in emulation where we will both * be slow and likely to have a large set of VLs. */ - ret =3D epoll_wait(epoll_fd, evs, tests, SIGNAL_INTERVAL_MS); + ret =3D epoll_wait(epoll_fd, evs, tests, poll_interval); if (ret < 0) { if (errno =3D=3D EINTR) continue; @@ -626,6 +627,7 @@ int main(int argc, char **argv) } =20 all_children_started =3D true; + poll_interval =3D SIGNAL_INTERVAL_MS; } =20 if ((timeout % LOG_INTERVALS) =3D=3D 0) --=20 2.39.2