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Re: [RFC PATCH 00/10] x86: undwarf unwinder

From Ingo Molnar <mingo@kernel.org>
Newsgroups linux.kernel
Subject Re: [RFC PATCH 00/10] x86: undwarf unwinder
Date 2017-06-01 08:10 +0200
Message-ID <tNrt0-7fK-17@gated-at.bofh.it> (permalink)
References <tNr9D-6Ua-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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* Josh Poimboeuf <jpoimboe@redhat.com> wrote:

> Here's the contents of the undwarf.txt file which explains the 'why' in
> more detail:

Ok, so the code quality looks pretty convincing to me - the new core 'undwarf' 
unwinder code is a _lot_ more readable than any of the Dwarf based attempts 
before.

That we control the debug info generation at build time is icing on the cake to 
me.

One thing I'd like to see on the list of benefits side of the equation is a size 
comparison of kernel .text, with frame pointers vs. undwarf, on 64-bit kernels.

Being able to generate more optimal code in the hottest code paths of the kernel 
is the _real_, primary upstream kernel benefit of a different debuginfo method - 
which has to be weighed against the pain of introducing a new unwinder. But this 
submission does not talk about that aspect at all, which should be fixed I think.

Thanks,

	Ingo

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[RFC PATCH 00/10] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  [RFC PATCH 06/10] x86/entry: add CFI hint undwarf annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
    Re: [RFC PATCH 06/10] x86/entry: add CFI hint undwarf annotations Andy Lutomirski <luto@kernel.org> - 2017-06-01 16:10 +0200
      Re: [RFC PATCH 06/10] x86/entry: add CFI hint undwarf annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 16:30 +0200
        Re: [RFC PATCH 06/10] x86/entry: add CFI hint undwarf annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 16:30 +0200
          Re: [RFC PATCH 06/10] x86/entry: add CFI hint undwarf annotations Andy Lutomirski <luto@kernel.org> - 2017-06-01 16:50 +0200
            Re: [RFC PATCH 06/10] x86/entry: add CFI hint undwarf annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 17:10 +0200
  [RFC PATCH 09/10] extable: add undwarf table sorting ability to sorttable script Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  [RFC PATCH 08/10] extable: rename 'sortextable' script to 'sorttable' Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  [RFC PATCH 05/10] objtool, x86: add facility for asm code to provide CFI hints Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
    Re: [RFC PATCH 05/10] objtool, x86: add facility for asm code to  provide CFI hints Andy Lutomirski <luto@kernel.org> - 2017-06-01 16:00 +0200
      Re: [RFC PATCH 05/10] objtool, x86: add facility for asm code to  provide CFI hints Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 16:20 +0200
        Re: [RFC PATCH 05/10] objtool, x86: add facility for asm code to  provide CFI hints Andy Lutomirski <luto@kernel.org> - 2017-06-01 16:50 +0200
          Re: [RFC PATCH 05/10] objtool, x86: add facility for asm code to  provide CFI hints Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 17:10 +0200
  [RFC PATCH 01/10] objtool: move checking code to check.c Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  [RFC PATCH 07/10] x86/asm: add CFI hint annotations to sync_core() Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  [RFC PATCH 04/10] objtool: add undwarf debuginfo generation Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
    Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 13:10 +0200
      Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 14:30 +0200
        Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Jiri Slaby <jslaby@suse.cz> - 2017-06-01 14:50 +0200
          Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 15:10 +0200
          Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 15:50 +0200
        Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 15:20 +0200
    Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 14:20 +0200
      Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 14:40 +0200
        Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 15:20 +0200
          Re: [RFC PATCH 10/10] x86/unwind: add undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 17:10 +0200
  [RFC PATCH 02/10] objtool, x86: add several functions and files to the objtool whitelist Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 07:50 +0200
  Re: [RFC PATCH 00/10] x86: undwarf unwinder Ingo Molnar <mingo@kernel.org> - 2017-06-01 08:10 +0200
    Re: [RFC PATCH 00/10] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 14:00 +0200
      Re: [RFC PATCH 00/10] x86: undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 14:20 +0200
        Re: [RFC PATCH 00/10] x86: undwarf unwinder Jiri Slaby <jslaby@suse.cz> - 2017-06-01 14:40 +0200
          Re: [RFC PATCH 00/10] x86: undwarf unwinder Jiri Slaby <jslaby@suse.cz> - 2017-06-01 15:00 +0200
          Re: [RFC PATCH 00/10] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 15:00 +0200
        Re: [RFC PATCH 00/10] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 14:50 +0200
          Re: [RFC PATCH 00/10] x86: undwarf unwinder Peter Zijlstra <peterz@infradead.org> - 2017-06-01 15:30 +0200
            Re: [RFC PATCH 00/10] x86: undwarf unwinder Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-06-06 16:20 +0200
          Re: [RFC PATCH 00/10] x86: undwarf unwinder Andy Lutomirski <luto@kernel.org> - 2017-06-01 16:00 +0200
      Re: [RFC PATCH 00/10] x86: undwarf unwinder Ingo Molnar <mingo@kernel.org> - 2017-06-01 16:00 +0200
        Re: [RFC PATCH 00/10] x86: undwarf unwinder Jiri Slaby <jslaby@suse.cz> - 2017-06-01 16:00 +0200
          Re: [RFC PATCH 00/10] x86: undwarf unwinder Jiri Slaby <jslaby@suse.cz> - 2017-06-02 10:40 +0200
        Re: [RFC PATCH 00/10] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-01 16:10 +0200
        Re: [RFC PATCH 00/10] x86: undwarf unwinder Jiri Slaby <jslaby@suse.cz> - 2017-06-01 16:10 +0200
          Re: [RFC PATCH 00/10] x86: undwarf unwinder Mel Gorman <mgorman@suse.de> - 2017-06-02 12:50 +0200

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