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Mon, 09 Mar 2026 16:10:00 -0700 (PDT) X-Received: by 2002:a05:600c:4f14:b0:485:3d00:efd with SMTP id 5b1f17b1804b1-4853d0017femr65932685e9.7.1773097800135; Mon, 09 Mar 2026 16:10:00 -0700 (PDT) Received: from localhost ([2a00:a041:e223:1b00:fe51:8bb:7986:c897]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4852378e700sm172553705e9.0.2026.03.09.16.09.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Mar 2026 16:09:59 -0700 (PDT) From: Costa Shulyupin To: linux-rt-users Cc: John Kacur , Costa Shulyupin , "Luis Claudio R. Goncalves" Subject: [PATCH v2] rt-tests: hwlatdetect: Add timestamp delta Date: Tue, 10 Mar 2026 01:09:18 +0200 Message-ID: <20260309230917.464377-2-costa.shul@redhat.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-rt-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add delta field that calculates the time interval between consecutive samples. For the first sample, the previous timestamp is initialized to 'nan' (Not a Number), so the first delta is also 'nan'. This helps identify periodic issues during hardware latency testing. v2: Address John Kacur's review comments: - Use float('nan') instead of string 'nan' for prev initialization - Compute float(ts) once and reuse for delta calculation and prev update Signed-off-by: Costa Shulyupin --- src/hwlatdetect/hwlatdetect.py | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/src/hwlatdetect/hwlatdetect.py b/src/hwlatdetect/hwlatdetect.py index 42b9f301718a..18ca930487f0 100755 --- a/src/hwlatdetect/hwlatdetect.py +++ b/src/hwlatdetect/hwlatdetect.py @@ -253,7 +253,8 @@ def detect(self): class Sample: 'private class for tracer sample data' - __slots__ = 'cpu', 'timestamp', 'inner', 'outer', 'count' + __slots__ = 'cpu', 'timestamp', 'delta', 'inner', 'outer', 'count' + prev = float('nan') def __init__(self, line): fields = line.split() @@ -276,14 +277,16 @@ def __init__(self, line): i, o = fields[6].split('/') ts = fields[7][3:] self.timestamp = str(ts) + ts_float = float(ts) + self.delta = ts_float - self.__class__.prev + self.__class__.prev = ts_float self.inner = int(i) self.outer = int(o) self.count = int(kv["count"]) if "count" in kv else None def __str__(self): - if self.count is not None: - return f"ts: {self.timestamp}, inner:{self.inner}, outer:{self.outer}, cpu:{self.cpu}, count:{self.count}" - return f"ts: {self.timestamp}, inner:{self.inner}, outer:{self.outer}, cpu:{self.cpu}" + s = f"ts: {self.timestamp}, delta:{self.delta:.6f}, inner:{self.inner}, outer:{self.outer}, cpu:{self.cpu}" + return s if self.count is None else s + f", count:{self.count}" def display(self): """ convert object to string and print """ -- 2.53.0