linux-kernel - Re: [PATCH v2] perf,x86: avoid missing caller address in stack traces captured in uprobe

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Message-ID: <CAEf4Bzb+8FOcC0kRiW5D-OLfBkX6TcHfto9oK57yQRy_eFHepA@mail.gmail.com>
Date: Wed, 3 Jul 2024 15:58:49 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: Andrii Nakryiko <andrii@...nel.org>, linux-trace-kernel@...r.kernel.org, 
	peterz@...radead.org, rostedt@...dmis.org, mhiramat@...nel.org, 
	x86@...nel.org, mingo@...hat.com, tglx@...utronix.de, 
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org, rihams@...com, 
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2] perf,x86: avoid missing caller address in stack traces
 captured in uprobe

On Wed, Jul 3, 2024 at 3:41 PM Josh Poimboeuf <jpoimboe@...nel.org> wrote:
>
> On Wed, Jul 03, 2024 at 01:23:39PM -0700, Andrii Nakryiko wrote:
> > > >  [0] https://docs.google.com/presentation/d/1k10-HtK7pP5CMMa86dDCdLW55fHOut4co3Zs5akk0t4
> > >
> > > I don't seem to have permission to open it.
> > >
> >
> > Argh, sorry, it's under my corporate account which doesn't allow
> > others to view it. Try this, I "published" it, let me know if that
> > still doesn't work:
> >
> >   [0] https://docs.google.com/presentation/d/e/2PACX-1vRgL3UPbkrznwtNPKn-sSjvan7tFeMqOrIyZAFSSEPYiWG20JGSP80jBmZqGwqMuBGVmv9vyLU4KRTx/pub
>
> The new link doesn't work either :-)
>

Goodness, sorry about that. I just recreated it under my public
account and shared it with the world. This HAS to work:

  https://docs.google.com/presentation/d/1eaOf9CVZlCOD6b7_UtZBYMfTyYIDZw9clyjzu-IIOIo

> > > > Few questions, while we are at it. Does it mean that
> > > > perf_callchain_user() will support working from sleepable context and
> > > > will wait for data to be paged in? Is anyone already working on this?
> > > > Any pointers?
> > >
> > > I had a prototype here:
> > >
> > >   https://lkml.kernel.org/lkml/cover.1699487758.git.jpoimboe@kernel.org
> > >
> > > Hopefully I can get started on v2 soon.
> >
> > Ok, so you are going to work on this. Please cc me on future revisions
> > then. Thanks!
>
> Will do!
>
> --
> Josh