RE: [PATCH v6 00/13] Add build ID to stacktraces

[David Laight]

From: Petr Mladek
> Sent: 11 May 2021 15:22
> 
> On Tue 2021-05-11 12:58:47, David Laight wrote:
> > From: Steven Rostedt
> > > Sent: 11 May 2021 13:53
> > >
> > > On Tue, 11 May 2021 12:36:06 +0000
> > > David Laight <David.Laight@xxxxxxxxxx> wrote:
> > >
> > > > >  x1 : ffffff93fef15788 x0 : ffffffe3622352e0
> > > > >  Call trace:
> > > > >   lkdtm_WARNING+0x28/0x30 [lkdtm ed5019fdf5e53be37cb1ba7899292d7e143b259e]
> > > > >   direct_entry+0x16c/0x1b4 [lkdtm ed5019fdf5e53be37cb1ba7899292d7e143b259e]
> > > > >   full_proxy_write+0x74/0xa4
> > > >
> > > > Is there any way to get it to print each module ID only once?
> > >
> > > If there's a trivial way to do that, then perhaps it should be done, but for
> > > now, this patch series isn't as obnoxious as the previous versions. It only
> > > affects stack traces, and I'm fine with that.
> >
> > True. Printing the id in the module list was horrid.
> >
> > The real downside is all the extra text that will overflow the
> > in-kernel buffer.
> > At least it shouldn't be extra lines causing screen wrap.
> > Unless the variable names are long - hi rust :-)
> 
> Note that the ID is printed only when CONFIG_STACKTRACE_BUILD_ID
> is enabled. It will be used only by some distros/vendors that
> use it to download the debuginfo packages.

Until Ubuntu decide to turn it on :-)

Actually, for the use case, the id could be trimmed significantly.
It is only trying to differentiate between builds of a specific module.
So even 8 digits would be plenty.

	David

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