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

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Message-ID: <4vih3tufuhksf5pi5ydaqfynwlq42sdydmdaqzytfmxqgwi6ao@qog7ho2kvz66>
Date: Thu, 28 Mar 2024 16:53:33 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Tejun Heo <tj@...nel.org>
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

On Thu, Mar 28, 2024 at 10:46:33AM -1000, Tejun Heo wrote:
> 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.

The disconnect is with you, Tejun. I use tracing all the time, and it's
not going to be much of a discussion if you're not going to formulate a
response.