linux-kernel - Re: [PATCH v2 0/6] Improve visibility of writeback

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Message-ID: <ZgXXKaZlmOWC-3mn@slm.duckdns.org>
Date: Thu, 28 Mar 2024 10:46:33 -1000
From: Tejun Heo <tj@...nel.org>
To: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Kemeng Shi <shikemeng@...weicloud.com>, akpm@...ux-foundation.org,
	willy@...radead.org, jack@...e.cz, bfoster@...hat.com,
	dsterba@...e.com, mjguzik@...il.com, dhowells@...hat.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 0/6] Improve visibility of writeback

Hello, Kent.

On Thu, Mar 28, 2024 at 04:22:13PM -0400, Kent Overstreet wrote:
> Most users are never going to touch tracing, let alone BPF; that's too
> much setup. But I can and do regularly tell users "check this, this and
> this" and debug things on that basis without ever touching their
> machine.

I think this is where the disconnect is. It's not difficult to set up at
all. Nowadays, in most distros, it comes down to something like run "pacman
-S bcc" and then run "/usr/share/bcc/tools/biolatpcts" with these params or
run this script I'm attaching. It is a signficant boost when debugging many
different kernel issues. I strongly suggest giving it a try and getting used
to it rather than resisting it.

Thanks.

-- 
tejun