* Josh Poimboeuf wrote:
> Anyway, I used some linker magic to temporarily move the unwinder code to the
> end of .text, so that unwinder changes don't add unexpected side effects to
> the
> microbenchmark behavior. Now I'm getting more consistent results: the packed
> struct is measuring ~2
On Fri, Jul 07, 2017 at 11:44:37AM +0200, Ingo Molnar wrote:
>
> * Josh Poimboeuf wrote:
>
> > On Thu, Jun 29, 2017 at 10:06:52AM -0500, Josh Poimboeuf wrote:
> > > On Thu, Jun 29, 2017 at 04:46:18PM +0200, Ingo Molnar wrote:
> > > >
> > > > * Josh Poimboeuf wrote:
> > > >
> > > > > > Plus, s
* Josh Poimboeuf wrote:
> On Thu, Jun 29, 2017 at 10:06:52AM -0500, Josh Poimboeuf wrote:
> > On Thu, Jun 29, 2017 at 04:46:18PM +0200, Ingo Molnar wrote:
> > >
> > > * Josh Poimboeuf wrote:
> > >
> > > > > Plus, shouldn't we use __packed for 'struct undwarf' to minimize the
> > > > > struct
On Thu, Jun 29, 2017 at 10:06:52AM -0500, Josh Poimboeuf wrote:
> On Thu, Jun 29, 2017 at 04:46:18PM +0200, Ingo Molnar wrote:
> >
> > * Josh Poimboeuf wrote:
> >
> > > > Plus, shouldn't we use __packed for 'struct undwarf' to minimize the
> > > > structure's size (to 6 bytes AFAICS?) - or is o
On Thu, Jun 29, 2017 at 04:46:18PM +0200, Ingo Molnar wrote:
>
> * Josh Poimboeuf wrote:
>
> > > Plus, shouldn't we use __packed for 'struct undwarf' to minimize the
> > > structure's size (to 6 bytes AFAICS?) - or is optimal packing of the main
> > > undwarf array already guaranteed on every
* Josh Poimboeuf wrote:
> > Plus, shouldn't we use __packed for 'struct undwarf' to minimize the
> > structure's size (to 6 bytes AFAICS?) - or is optimal packing of the main
> > undwarf array already guaranteed on every platform with this layout?
>
> Ah yes, it should definitely be packed (a
On Thu, Jun 29, 2017 at 09:25:12AM +0200, Ingo Molnar wrote:
> > +/*
> > + * This struct contains a simplified version of the DWARF Call Frame
> > + * Information standard. It contains only the necessary parts of the real
> > + * DWARF, simplified for ease of access by the in-kernel unwinder. It
On Thu, Jun 29, 2017 at 09:14:14AM +0200, Ingo Molnar wrote:
>
> * Josh Poimboeuf wrote:
>
> > Now that objtool knows the states of all registers on the stack for each
> > instruction, it's straightforward to generate debuginfo for an unwinder
> > to use.
> >
> > Instead of generating DWARF, ge
* Josh Poimboeuf wrote:
> +#ifndef _UNDWARF_TYPES_H
> +#define _UNDWARF_TYPES_H
> +
> +/*
> + * The UNDWARF_REG_* registers are base registers which are used to find
> other
> + * registers on the stack.
> + *
> + * The CFA (call frame address) is the value of the stack pointer on the
> + * pre
* Josh Poimboeuf wrote:
> Now that objtool knows the states of all registers on the stack for each
> instruction, it's straightforward to generate debuginfo for an unwinder
> to use.
>
> Instead of generating DWARF, generate a new format called undwarf, which
> is more suitable for an in-kernel
Now that objtool knows the states of all registers on the stack for each
instruction, it's straightforward to generate debuginfo for an unwinder
to use.
Instead of generating DWARF, generate a new format called undwarf, which
is more suitable for an in-kernel unwinder. See
tools/objtool/Documenta
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