From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 4B3B833A70E; Tue, 18 Aug 2026 21:23:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787088205; cv=none; b=PNpBgSG1QTkUjAzx8Y7ybaeiXkYiFX1/m9aQZHj+iQ0yAOyv7EDJofF3zDRzz96xZfbwYKnDtR9XR/s2NCOtSSYE7Ujfh2hRgX+hp6xr7tafhmpWSYex8yEhYfvkcJEsctTQ2RM8g2owaWIn+Bgwz5ysCeWzH2EjMq8dL+ran4g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787088205; c=relaxed/simple; bh=w3iZyoMUyzY/d1rktT8WuyAMsMY0ynD45FsOqHfO7kw=; h=From:To:Cc:In-Reply-To:References:Subject:Message-Id:Date: MIME-Version:Content-Type; b=ZBK8N6Xz0esuAQyOUN9NriXKeeeW6RzZVXmifx2r08ef+ZfOLfyhuFPMHBoOzwtBskoSZI+9egd5tZNeBbEwFkVzg8+eZI/utZFVExU6RdNhPpIGOGN9QpXWs0Iv6Y+tNOkY1Vg7221iFOGwe1+vXnJWs4vMgkIk14/VZXy4tlE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=e1oQPcRK; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="e1oQPcRK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 943191F00A3D; Tue, 18 Aug 2026 21:23:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787088203; bh=DlK0/M/5LbU1lPSxuxYeEd4K2IxnPXpvav2pGLkJjVI=; h=From:To:Cc:In-Reply-To:References:Subject:Date; b=e1oQPcRKd4R3DopVb3bmCkRYrDUH8h0GAsipYqj5pvehHCTKzt8NDy3HtCBf+cI6y LV96AfT3YkcgeRTF+7VNNpTA/26zVwHX/ZG8bzfQYgX+0eOLHI96zHUSc8V/ACGmMC qpxkJAsLSQXATYK1trAH1IdoSStFZq01VsDwjHvKg5dGAZ5zmLBKdrSdEgJAsi2eoG xYqbXNJ4c+n/3Wz/ZL241VNtlk+DRDVLIRONDkr7wiyZlXkv7N9KbBYbilhFcSZmPK kv4FhQ7WvXbePntt5dRQ8OwGfTKSKm7uPJ7Iae52YJ4aTZuCrOgo3B6VloQs/TCCn5 tNScvuFWSqO0Q== From: Namhyung Kim To: acme@kernel.org, Ian Rogers Cc: adrian.hunter@intel.com, james.clark@linaro.org, jolsa@kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tshah@linux.ibm.com In-Reply-To: <20260806041414.20327-1-irogers@google.com> References: <20260806021038.2291417-1-irogers@google.com> <20260806041414.20327-1-irogers@google.com> Subject: Re: [PATCH v2] perf evlist: Warn when 'sleep' workload is used without system-wide (-a) option Message-Id: <178708820355.2068376.15426283047599013628.b4-ty@kernel.org> Date: Tue, 18 Aug 2026 14:23:23 -0700 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Mailer: b4 0.15-dev-c04d2 On Wed, 05 Aug 2026 21:14:14 -0700, Ian Rogers wrote: > A common mistake when trying to record system-wide profiles for a given > duration is running commands like 'perf record sleep 1' or 'perf stat > sleep 1' without passing '-a' / '--all-cpus'. When '-a' is omitted, perf > defaults to per-process monitoring of the sleep process itself, which > does not collect system-wide activity and records very few events. > > Add a warning in evlist__prepare_workload() when the workload executable > is 'sleep' and system-wide mode is not enabled. > > [...] Applied to perf-tools-next, thanks! Best regards, Namhyung