linux-kernel - Re: [PATCH v2 11/15] blktrace: add block trace commands for zone operations

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Message-ID: <20251003073257.GE12624@lst.de>
Date: Fri, 3 Oct 2025 09:32:57 +0200
From: Christoph Hellwig <hch@....de>
To: Johannes Thumshirn <johannes.thumshirn@....com>
Cc: Jens Axboe <axboe@...nel.dk>, Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org, linux-btrace@...r.kernel.org,
	John Garry <john.g.garry@...cle.com>,
	Hannes Reinecke <hare@...e.de>, Damien Le Moal <dlemoal@...nel.org>,
	Christoph Hellwig <hch@....de>, Naohiro Aota <naohiro.aota@....com>,
	Shinichiro Kawasaki <shinichiro.kawasaki@....com>,
	Chaitanya Kulkarni <chaitanyak@...dia.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH v2 11/15] blktrace: add block trace commands for zone
 operations

On Thu, Sep 25, 2025 at 05:02:27PM +0200, Johannes Thumshirn wrote:
> Add block trace commands for zone operations. These are added as a
> separate set of 'block trace commands' shifted by 32bit so that they do
> not interfere with the old 16bit wide trace command field in 'struct
> blk_io_trace' action.

Can you explain how the commands are handled for old/new here?

Because I'd still much prefer to sort things out so that they make
sense for the new code if possible.  i.e. have a 32-bit command
and 32 bit flags, and use sensible encoding for the new one, and
remap the supported once to the old organically grown one.