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Tue, 10 Nov 2026 19:13:50 -0800 (PST) Received: from mi-ThinkCentre-M760t.mioffice.cn ([43.224.245.234]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1b3b5b2fc14sm10960507c88.12.2026.11.10.19.13.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Nov 2026 19:13:49 -0800 (PST) From: Wenwu Hou To: rostedt@goodmis.org Cc: mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org, Wenwu Hou Subject: [PATCH] tracing/hwlat: Store the maximum latency in nanoseconds Date: Wed, 11 Nov 2026 11:13:04 +0800 Message-ID: <20261111031304.1442318-1-hwenwur@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit tr->max_latency is expected to hold nanoseconds: tracing_max_lat_read() converts it with nsecs_to_usecs() to print the usecs documented in hwlat_detector.rst, and the other latency tracers store nanoseconds there too. Fixes: e7c15cd8a1133 ("tracing: Added hardware latency tracer") Signed-off-by: Wenwu Hou --- kernel/trace/trace_hwlat.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c index 65e184d800ff1..701b6a542e51a 100644 --- a/kernel/trace/trace_hwlat.c +++ b/kernel/trace/trace_hwlat.c @@ -293,7 +293,7 @@ static int get_sample(void) s.count = count; trace_hwlat_sample(&s); - latency = max(sample, outer_sample); + latency = max(sample, outer_sample) * NSEC_PER_USEC; /* Keep a running maximum ever recorded hardware latency */ if (latency > tr->max_latency) { -- 2.43.0