From nobody Wed Dec 17 17:07:48 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ED8FBC6FD18 for ; Tue, 18 Apr 2023 14:53:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231713AbjDROxi (ORCPT ); Tue, 18 Apr 2023 10:53:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230026AbjDROxd (ORCPT ); Tue, 18 Apr 2023 10:53:33 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 198FFB46E; Tue, 18 Apr 2023 07:53:29 -0700 (PDT) Date: Tue, 18 Apr 2023 14:53:27 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1681829608; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=H6sWjK/1vBRPdFiB0bWblioUbBh8IBBuVDZSPm6isq4=; b=JL7SbDfBmTHRaOkrlEAAhpQst0PY37zwQTd19smMl+zbXLcPoQ0RKSOs9Sqv6UjkO3zqTj K9xj0s6jPT5JRfndwXDz0XBK3QZdevyIxucsDVzMv72q4K+Mr0eOZYNTmweKnxZrocVLbz IoVc5pl1mRsE+TAbEqaBFmxxI+YUpC58DICyUOg5BbQ/SWMtBkHNtXB00jR3WpiD+zMp7+ Il7WpojK3rZ2cTpCKUEJdzMMSmXQwwl+l52ag9p6T9nlDzyeg9+hLyIcx04PSvdPbUArEJ frodeNKL3b5WEzO6QCG5IHhUrhp7q7MPEGOuj9vtKv0vGF5sIA+UiEqHlcdLKQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1681829608; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=H6sWjK/1vBRPdFiB0bWblioUbBh8IBBuVDZSPm6isq4=; b=SaTiNSB11xZ+fzSJ63tz6T89byFobuZiIxk7P/VtBkzjMTFlYx4QXeqU5F9Cd30C/eIhgv LQi+CNeSh//+xLAw== From: "tip-bot2 for Frederic Weisbecker" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: timers/core] selftests/proc: Assert clock_gettime(CLOCK_BOOTTIME) VS /proc/uptime monotonicity Cc: Thomas Gleixner , Frederic Weisbecker , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20230222144649.624380-9-frederic@kernel.org> References: <20230222144649.624380-9-frederic@kernel.org> MIME-Version: 1.0 Message-ID: <168182960725.404.16948283844933816567.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the timers/core branch of tip: Commit-ID: 263dda24fff0957f6b0a9abde2809122f7f0fad8 Gitweb: https://git.kernel.org/tip/263dda24fff0957f6b0a9abde2809122f= 7f0fad8 Author: Frederic Weisbecker AuthorDate: Wed, 22 Feb 2023 15:46:49 +01:00 Committer: Thomas Gleixner CommitterDate: Tue, 18 Apr 2023 16:35:13 +02:00 selftests/proc: Assert clock_gettime(CLOCK_BOOTTIME) VS /proc/uptime monoto= nicity The first field of /proc/uptime relies on the CLOCK_BOOTTIME clock which can also be fetched from clock_gettime() API. Improve the test coverage while verifying the monotonicity of CLOCK_BOOTTIME accross both interfaces. Suggested-by: Thomas Gleixner Signed-off-by: Frederic Weisbecker Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/20230222144649.624380-9-frederic@kernel.org --- tools/testing/selftests/proc/proc-uptime-001.c | 21 ++++++++++++---- tools/testing/selftests/proc/proc-uptime-002.c | 22 +++++++++++++---- tools/testing/selftests/proc/proc-uptime.h | 12 +++++++++- 3 files changed, 47 insertions(+), 8 deletions(-) diff --git a/tools/testing/selftests/proc/proc-uptime-001.c b/tools/testing= /selftests/proc/proc-uptime-001.c index 35bddd9..f335eec 100644 --- a/tools/testing/selftests/proc/proc-uptime-001.c +++ b/tools/testing/selftests/proc/proc-uptime-001.c @@ -13,9 +13,9 @@ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ -// Test that boottime value in /proc/uptime increments monotonically. -// We don't test idle time monotonicity due to broken iowait task -// counting, cf: comment above get_cpu_idle_time_us() +// Test that boottime value in /proc/uptime and CLOCK_BOOTTIME increment +// monotonically. We don't test idle time monotonicity due to broken iowait +// task counting, cf: comment above get_cpu_idle_time_us() #undef NDEBUG #include #include @@ -27,7 +27,7 @@ =20 int main(void) { - uint64_t start, u0, u1; + uint64_t start, u0, u1, c0, c1; int fd; =20 fd =3D open("/proc/uptime", O_RDONLY); @@ -35,10 +35,23 @@ int main(void) =20 u0 =3D proc_uptime(fd); start =3D u0; + c0 =3D clock_boottime(); + do { u1 =3D proc_uptime(fd); + c1 =3D clock_boottime(); + + /* Is /proc/uptime monotonic ? */ assert(u1 >=3D u0); + + /* Is CLOCK_BOOTTIME monotonic ? */ + assert(c1 >=3D c0); + + /* Is CLOCK_BOOTTIME VS /proc/uptime monotonic ? */ + assert(c0 >=3D u0); + u0 =3D u1; + c0 =3D c1; } while (u1 - start < 100); =20 return 0; diff --git a/tools/testing/selftests/proc/proc-uptime-002.c b/tools/testing= /selftests/proc/proc-uptime-002.c index 7ad79d5..ae453da 100644 --- a/tools/testing/selftests/proc/proc-uptime-002.c +++ b/tools/testing/selftests/proc/proc-uptime-002.c @@ -13,9 +13,10 @@ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ -// Test that boottime value in /proc/uptime increments monotonically -// while shifting across CPUs. We don't test idle time monotonicity -// due to broken iowait task counting, cf: comment above get_cpu_idle_time= _us() +// Test that boottime value in /proc/uptime and CLOCK_BOOTTIME increment +// monotonically while shifting across CPUs. We don't test idle time +// monotonicity due to broken iowait task counting, cf: comment above +// get_cpu_idle_time_us() #undef NDEBUG #include #include @@ -43,10 +44,10 @@ static inline int sys_sched_setaffinity(pid_t pid, unsi= gned int len, unsigned lo =20 int main(void) { + uint64_t u0, u1, c0, c1; unsigned int len; unsigned long *m; unsigned int cpu; - uint64_t u0, u1; int fd; =20 /* find out "nr_cpu_ids" */ @@ -62,6 +63,8 @@ int main(void) assert(fd >=3D 0); =20 u0 =3D proc_uptime(fd); + c0 =3D clock_boottime(); + for (cpu =3D 0; cpu < len * 8; cpu++) { memset(m, 0, len); m[cpu / (8 * sizeof(unsigned long))] |=3D 1UL << (cpu % (8 * sizeof(unsi= gned long))); @@ -70,8 +73,19 @@ int main(void) sys_sched_setaffinity(0, len, m); =20 u1 =3D proc_uptime(fd); + c1 =3D clock_boottime(); + + /* Is /proc/uptime monotonic ? */ assert(u1 >=3D u0); + + /* Is CLOCK_BOOTTIME monotonic ? */ + assert(c1 >=3D c0); + + /* Is CLOCK_BOOTTIME VS /proc/uptime monotonic ? */ + assert(c0 >=3D u0); + u0 =3D u1; + c0 =3D c1; } =20 return 0; diff --git a/tools/testing/selftests/proc/proc-uptime.h b/tools/testing/sel= ftests/proc/proc-uptime.h index ca55abe..730cce4 100644 --- a/tools/testing/selftests/proc/proc-uptime.h +++ b/tools/testing/selftests/proc/proc-uptime.h @@ -19,9 +19,21 @@ #include #include #include +#include =20 #include "proc.h" =20 +static uint64_t clock_boottime(void) +{ + struct timespec ts; + int err; + + err =3D clock_gettime(CLOCK_BOOTTIME, &ts); + assert(err >=3D 0); + + return (ts.tv_sec * 100) + (ts.tv_nsec / 10000000); +} + static uint64_t proc_uptime(int fd) { uint64_t val1, val2;