From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f201.google.com (mail-dy1-f201.google.com [74.125.82.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EF71A47A0B4 for ; Tue, 16 Jun 2026 16:48:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781628513; cv=none; b=Ya54wdEvIIEhAh1ww9voKeMyJjab3M8eBsYMmFIRPWGKUNKiMzHmuO8ohCIiA2V43a1pVzGzi9OClvoUjrdBIiqaxAS8Xwq1wcBBbMA7Qr9jLqmsTSamYSb8e8xFwJD4PnMlrpjj9ID9fywMhfUmFajq5XHskHJzGSIh3IsVaoc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781628513; c=relaxed/simple; bh=Z1eJjbumhJa9EvDqz+ZQYDqGKgyB4pXDI6d6kWbBTRs=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=aSi1yZby/q7j8JboPFxrSR+khuXz2xUW+KkNJU4fC22e0J55G9lRaGMsbjZ8yBzm4T5gfF7NZG5sdHHlWz/DJ1UG9DRr1wxBuj6iTX3A6D5GcOqlA70HzSLuxxA9Kc5pG3PuAW+2HIGQqmcCt2N4+Awg/eeRdKZGBIlR0eM+z1w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=iPwFsxC6; arc=none smtp.client-ip=74.125.82.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="iPwFsxC6" Received: by mail-dy1-f201.google.com with SMTP id 5a478bee46e88-307fd7138b1so7000186eec.0 for ; Tue, 16 Jun 2026 09:48:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1781628511; x=1782233311; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=S1d5y401PNNFCdF8+BK5lnYLSP8NUBaQ4PbHS+Gxyvk=; b=iPwFsxC6+mVPbOSRfaHDc7VdX6/TteXQpWAHYO8ZGibK22k9KwsBMXDTOjdDieypMr 3Zen/OHvilOpfKB7hK9EjuGzavdkeBdd9jiHuT9H4P3+4CLjW0rmiNDqROyqEiNpwXQA 5lQ2lqSCZrZPpA+HsRaDYfFghyIYcggF+787q4vfXLNTjbUSowlq1srEaPFmlad1MnoU Dpa0XFlPtwAQVfxlUMkCakoDYeAMuPgptcIyAWQzOFznDKKinND0TGtsle/5HIticOmD gOtXFMXT/dqwsEcpeJzARX9B0ZZnnKq9J+q6OHcALzPluis9BKD1UUVlxoEE497OqQQ8 vAmw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781628511; x=1782233311; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=S1d5y401PNNFCdF8+BK5lnYLSP8NUBaQ4PbHS+Gxyvk=; b=tHO4WIe6qzbtbt7lGnr9N4Tmhx5vQUFXOYSgTojD1hypisXsyxmyYzyaO/bCNJDGeB gImO7nLnpXdWs8y6kohzJaDdzmCgQZ8e6HOKmmR5Ad1Hm3vUwJDosXVGUfac6OGdfpw9 8OD8I1vgJshboaIZiG7KUCigXcfQB9i0HN7CTkjXjyaSSMnZtxZMAJF+uAmUHRtnj+Y0 qQ855VCtxWIVU320V43q5hfqq+X5E+oJAFYOENeP9mZqbKNCwXzJ+wRpCtsER154LQvV cqSDX3OWFCChvDkaIrHNK/PNIw4UNyZcD5D4T+hqCv6g55I7+1mY6n/ZJxrQ5wK05CsG G2iQ== X-Forwarded-Encrypted: i=1; AFNElJ+HvCh1o+XL4QoIsIdyFgboyTA9GKMceDkGOonppDmjRLPxVU2Q2yYEJ5linIWcWRoHTpth/6VuGLu1Kt/867u+@vger.kernel.org X-Gm-Message-State: AOJu0Yx3F0hrPwCTmGse+NiMGDbY7as4TFhn4Wxmb6jVJYVctOfjSQma VJszpdxMtVfmTAE9MCc4noScAMD6vxSEcSztCELA+Mbak/JZVg6bJGnjQhK4Q5OxQH1/IDYH49o 2krhpOq/p0Q== X-Received: from dled11-n2.prod.google.com ([2002:a05:701b:42cb:20b0:138:1652:bf26]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:701b:2902:b0:139:8172:76b2 with SMTP id a92af1059eb24-1398172785bmr1932755c88.21.1781628510753; Tue, 16 Jun 2026 09:48:30 -0700 (PDT) Date: Tue, 16 Jun 2026 09:48:08 -0700 In-Reply-To: <20260616164819.370939-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260616061404.41929-1-irogers@google.com> <20260616164819.370939-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.1189.g8c84645362-goog Message-ID: <20260616164819.370939-4-irogers@google.com> Subject: [PATCH v3 03/13] perf tests workloads: Support sub-second durations in noploop and thloop From: Ian Rogers To: irogers@google.com, acme@kernel.org, namhyung@kernel.org Cc: adrian.hunter@intel.com, james.clark@linaro.org, jolsa@kernel.org, leo.yan@arm.com, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, thomas.falcon@intel.com, tmricht@linux.ibm.com Content-Type: text/plain; charset="UTF-8" Currently, the noploop and thloop workloads only support sleep durations in integer seconds because they parse the argument using atoi() and use alarm() for timer signaling. To support much shorter execution times in tests (speeding up test suites and allowing faster retries), change the input parsing to use atof() for double floating-point seconds. Use ualarm() for fractional durations less than 1.0 seconds, and fall back to alarm() for durations of 1.0 second or more. Assisted-by: Antigravity:gemini-3.1-pro Signed-off-by: Ian Rogers --- tools/perf/tests/workloads/noploop.c | 17 ++++++++++++++--- tools/perf/tests/workloads/thloop.c | 16 +++++++++++----- 2 files changed, 25 insertions(+), 8 deletions(-) diff --git a/tools/perf/tests/workloads/noploop.c b/tools/perf/tests/workloads/noploop.c index 656e472e6188..ca9f871e136f 100644 --- a/tools/perf/tests/workloads/noploop.c +++ b/tools/perf/tests/workloads/noploop.c @@ -15,15 +15,26 @@ static void sighandler(int sig __maybe_unused) static int noploop(int argc, const char **argv) { - int sec = 1; + double sec = 1.0; pthread_setname_np(pthread_self(), "perf-noploop"); if (argc > 0) - sec = atoi(argv[0]); + sec = atof(argv[0]); + + if (!(sec > 0.0)) { + fprintf(stderr, "Error: seconds (%f) must be > 0\n", sec); + return 1; + } signal(SIGINT, sighandler); signal(SIGALRM, sighandler); - alarm(sec); + + if (sec < 1.0) { + useconds_t usecs = (useconds_t)(sec * 1000000.0); + + ualarm(usecs > 0 ? usecs : 1, 0); + } else + alarm((unsigned int)sec); while (!done) continue; diff --git a/tools/perf/tests/workloads/thloop.c b/tools/perf/tests/workloads/thloop.c index bd8168f883fb..c830d739489f 100644 --- a/tools/perf/tests/workloads/thloop.c +++ b/tools/perf/tests/workloads/thloop.c @@ -31,14 +31,15 @@ static void *thfunc(void *arg) static int thloop(int argc, const char **argv) { - int nt = 2, sec = 1, err = 1; + int nt = 2, err = 1; + double sec = 1.0; pthread_t *thread_list = NULL; if (argc > 0) - sec = atoi(argv[0]); + sec = atof(argv[0]); - if (sec <= 0) { - fprintf(stderr, "Error: seconds (%d) must be >= 1\n", sec); + if (!(sec > 0.0)) { + fprintf(stderr, "Error: seconds (%f) must be > 0\n", sec); return 1; } @@ -67,7 +68,12 @@ static int thloop(int argc, const char **argv) goto out; } } - alarm(sec); + if (sec < 1.0) { + useconds_t usecs = (useconds_t)(sec * 1000000.0); + + ualarm(usecs > 0 ? usecs : 1, 0); + } else + alarm((unsigned int)sec); test_loop(); err = 0; out: -- 2.54.0.1189.g8c84645362-goog