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

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Message-ID: <Zg2jdcochRXNdDZX@slm.duckdns.org>
Date: Wed, 3 Apr 2024 08:44:05 -1000
From: Tejun Heo <tj@...nel.org>
To: Jan Kara <jack@...e.cz>
Cc: Kent Overstreet <kent.overstreet@...ux.dev>,
	Kemeng Shi <shikemeng@...weicloud.com>, akpm@...ux-foundation.org,
	willy@...radead.org, 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,

On Wed, Apr 03, 2024 at 06:27:16PM +0200, Jan Kara wrote:
> Yeah, BPF is great and I use it but to fill in some cases from practice,
> there are sysadmins refusing to install bcc or run your BPF scripts on
> their systems due to company regulations, their personal fear, or whatever.
> So debugging with what you can achieve from a shell is still the thing
> quite often.

Yeah, I mean, this happens with anything new. Tracing itself took quite a
while to be adopted widely. BPF, bcc, bpftrace are all still pretty new and
it's likely that the adoption line will keep shifting for quite a while.
Besides, even with all the new gizmos there definitely are cases where good
ol' cat interface makes sense.

So, if the static interface makes sense, we add it but we should keep in
mind that the trade-offs for adding such static infrastructure, especially
for the ones which aren't *widely* useful, are rather quickly shfiting in
the less favorable direction.

Thanks.

-- 
tejun