linux-kernel - Re: [PATCH 00/40] Memory allocation profiling

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Message-ID: <ZFKubD/lq7oB4svV@moria.home.lan>
Date:   Wed, 3 May 2023 14:56:44 -0400
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Tejun Heo <tj@...nel.org>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...e.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
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Subject: Re: [PATCH 00/40] Memory allocation profiling

On Wed, May 03, 2023 at 08:40:07AM -1000, Tejun Heo wrote:
> > Yeah, easy / default visibility argument does make sense to me.
> 
> So, a bit of addition here. If this is the thrust, the debugfs part seems
> rather redundant, right? That's trivially obtainable with tracing / bpf and
> in a more flexible and performant manner. Also, are we happy with recording
> just single depth for persistent tracking?

Not sure what you're envisioning?

I'd consider the debugfs interface pretty integral; it's much more
discoverable for users, and it's hardly any code out of the whole
patchset.

Single depth was discussed previously. It's what makes it cheap enough
to be always-on (saving stack traces is expensive!), and I find the
output much more usable than e.g. page owner.