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

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Message-ID: <CAPAsAGxcCJai6PpTVOkqAB-vG+Q71hb1exsK79hJ7Kb2eKAtjA@mail.gmail.com>
Date:   Wed, 3 May 2023 22:04:21 +0200
From:   Andrey Ryabinin <ryabinin.a.a@...il.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Kent Overstreet <kent.overstreet@...ux.dev>,
        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 3, 2023 at 6:35 PM Tejun Heo <tj@...nel.org> wrote:
>
> Hello, Kent.
>
> On Wed, May 03, 2023 at 04:05:08AM -0400, Kent Overstreet wrote:
> > No, we're still waiting on the tracing people to _demonstrate_, not
> > claim, that this is at all possible in a comparable way with tracing.
>
> So, we (meta) happen to do stuff like this all the time in the fleet to hunt
> down tricky persistent problems like memory leaks, ref leaks, what-have-you.
> In recent kernels, with kprobe and BPF, our ability to debug these sorts of
> problems has improved a great deal. Below, I'm attaching a bcc script I used
> to hunt down, IIRC, a double vfree. It's not exactly for a leak but leaks
> can follow the same pattern.
>

For leaks there is example bcc
https://github.com/iovisor/bcc/blob/master/tools/memleak.py