From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-186.mta1.migadu.com (out-186.mta1.migadu.com [95.215.58.186]) (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 4DAA9346AC3 for ; Fri, 17 Jul 2026 04:29:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.186 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784262544; cv=none; b=YAaaIBq4IoR38hU8bIiDkh9xDBfr55aVOTvp2k6+ti7qMajb9v78qdsW4wCrpogtGRUqDxBL2BqDT5cjgKRPXG1/DSB/x6hcG3PA5IVqjO8kXZYnT4QR0IkxItBYwXtnZf3ZKHMUgOHVGpq+y+1qsnY+EPIC8BbaXec7iXDgFJY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784262544; c=relaxed/simple; bh=cqVgEQjGi8SC8nIGs3Bo9AwpjXz1B44w2UNfMMxe+ZQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=gRiQ6FKiY1GYzuD2GlAw/2Oc+FJXisUw1FLcb2NzVqFrj9qVAe2axw65535Sm4g+w5cIxCatAWVWQD3Y+RqIuumvnGKtduESP3zke2gzYLLFO+J6lY/NFEovyhfskGqQPNuXTviML4dLJz3AvlWhnbFVzNZ2Ek4Z1UKP14CkNx4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=e1r4t96W; arc=none smtp.client-ip=95.215.58.186 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="e1r4t96W" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1784262541; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=rYkAJ6k25UpukOkE6eF37TfWeES/EpuM0W49M8Ed5io=; b=e1r4t96Wcno2ya2yjCaWkx5Op9S4qoxSr7fLp8P03JMRpkm3NAM1CtQAwATn7csNf9WnmZ Fx/vjHpQClf5JUOqjwdH4K9M0k473XAKW3+dLFsRgFzBEyXwDiuZehgcbqOkFxRagfj5mu LkuhUjuwxbDBFtxsJM/jaFawt6+UvCE= From: Tao Cui To: Tejun Heo Cc: Johannes Weiner , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Jonathan Corbet , Shuah Khan , Josef Bacik , Jens Axboe , cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Tao Cui Subject: [PATCH 0/2] blk-iolatency: fix io.latency documentation accuracy Date: Fri, 17 Jul 2026 12:28:15 +0800 Message-ID: <20260717042817.2001826-1-cui.tao@linux.dev> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT From: Tao Cui Hi, This series fixes three inaccuracies in the io.latency documentation (Documentation/admin-guide/cgroup-v2.rst), all caused by the doc describing only rotational-device behavior: Patch 1 documents the rotational vs non-rotational difference: throttling is based on average latency on rotational devices but on the fraction of IOs that miss the target on non-rotational devices; the tuning guidance and io.stat field list are updated accordingly (avg_lat/win are rotational-only; missed/total are documented for non-rotational devices). Patch 2 corrects the delay unit: io.stat reports delay_nsec in nanoseconds, not microseconds as the doc stated. Both patches are documentation-only and checkpatch-clean. Tao Cui (2): Docs/admin-guide/cgroup-v2: document io.latency rotational vs non-rotational behavior Docs/admin-guide/cgroup-v2: fix delay_nsec unit in io.latency doc Documentation/admin-guide/cgroup-v2.rst | 53 +++++++++++++++++-------- 1 file changed, 36 insertions(+), 17 deletions(-) -- 2.43.0