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From: Andi Kleen <ak@linux.intel.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Fengguang Wu <fengguang.wu@intel.com>,
	Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
	Network Development <netdev@vger.kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	intel-wired-lan@lists.osuosl.org, Michal Marek <mmarek@suse.cz>,
	Sam Ravnborg <sam@ravnborg.org>, Dirk Gouders <dirk@gouders.net>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	kbuild test robot <lkp@intel.com>,
	"Zhang, Rui" <rui.zhang@intel.com>,
	"Lu, Aaron" <aaron.lu@intel.com>, "H.J. Lu" <hjl.tools@gmail.com>
Subject: Re: CONFIG_DEBUG_INFO_SPLIT impacts on faddr2line
Date: Mon, 13 Nov 2017 15:51:40 -0800	[thread overview]
Message-ID: <20171113235140.GR8522@tassilo.jf.intel.com> (raw)
In-Reply-To: <CA+55aFzEb1qp872nO4Y20cY9WHdek2MC=7XX1xNcN8q1WvTOaw@mail.gmail.com>

> I wonder if there is some way to use the split format for the
> intermediate files, but then for the very final link bring them all in
> and make the end result be a traditional single binary. I'm not
> talking the separate "dwp" package that packs multiple dwo files into
> one, but to actually link them all in at the one.
> 
> Sure, it would lose some of the advantage, but I think a large portion
> of the -gsplit-dwarf advantage is about the intermediate state. No?

Not sure it's worth to do complicated workarounds. I assume
it will be not that difficult to fix binutils (after all
gdb works), and disabling the option is a reasonable workaround.

> 
> I tried to google for it, but couldn't find anything. But apparently
> elfutils doesn't support dwo files either. It seems mainly the linker
> and gdb itself that supports it.

The original design document is

https://gcc.gnu.org/wiki/DebugFission

-Andi

WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <ak@linux.intel.com>
To: intel-wired-lan@osuosl.org
Subject: [Intel-wired-lan] CONFIG_DEBUG_INFO_SPLIT impacts on faddr2line
Date: Mon, 13 Nov 2017 15:51:40 -0800	[thread overview]
Message-ID: <20171113235140.GR8522@tassilo.jf.intel.com> (raw)
In-Reply-To: <CA+55aFzEb1qp872nO4Y20cY9WHdek2MC=7XX1xNcN8q1WvTOaw@mail.gmail.com>

> I wonder if there is some way to use the split format for the
> intermediate files, but then for the very final link bring them all in
> and make the end result be a traditional single binary. I'm not
> talking the separate "dwp" package that packs multiple dwo files into
> one, but to actually link them all in at the one.
> 
> Sure, it would lose some of the advantage, but I think a large portion
> of the -gsplit-dwarf advantage is about the intermediate state. No?

Not sure it's worth to do complicated workarounds. I assume
it will be not that difficult to fix binutils (after all
gdb works), and disabling the option is a reasonable workaround.

> 
> I tried to google for it, but couldn't find anything. But apparently
> elfutils doesn't support dwo files either. It seems mainly the linker
> and gdb itself that supports it.

The original design document is

https://gcc.gnu.org/wiki/DebugFission

-Andi

  reply	other threads:[~2017-11-13 23:51 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-07 10:21 [vlan_device_event] BUG: unable to handle kernel paging request at 6b6b6ccf Fengguang Wu
2017-11-07 16:25 ` Linus Torvalds
2017-11-07 16:46   ` Fengguang Wu
2017-11-08  9:48   ` Fengguang Wu
2017-11-08 16:20     ` Linus Torvalds
2017-11-08 16:20       ` [Intel-wired-lan] " Linus Torvalds
2017-11-08 17:12       ` Fengguang Wu
2017-11-08 17:12         ` [Intel-wired-lan] " Fengguang Wu
2017-11-08 17:18         ` Fengguang Wu
2017-11-08 17:18           ` [Intel-wired-lan] " Fengguang Wu
2017-11-08 18:05         ` Linus Torvalds
2017-11-08 18:05           ` [Intel-wired-lan] " Linus Torvalds
2017-11-08 18:36         ` Alexander Duyck
2017-11-08 18:36           ` [Intel-wired-lan] " Alexander Duyck
2017-11-09  3:12           ` Fengguang Wu
2017-11-09  3:12             ` [Intel-wired-lan] " Fengguang Wu
2017-11-09  4:09             ` Fengguang Wu
2017-11-09  4:09               ` [Intel-wired-lan] " Fengguang Wu
2017-11-09  7:22               ` Fengguang Wu
2017-11-09  7:22                 ` [Intel-wired-lan] " Fengguang Wu
2017-11-09  6:34             ` Cong Wang
2017-11-09  6:34               ` [Intel-wired-lan] " Cong Wang
2017-11-09  6:55               ` Fengguang Wu
2017-11-09  6:55                 ` [Intel-wired-lan] " Fengguang Wu
2017-11-09  7:43                 ` Fengguang Wu
2017-11-09  7:43                   ` [Intel-wired-lan] " Fengguang Wu
2017-11-09 15:51               ` Girish Moodalbail
2017-11-09 15:51                 ` [Intel-wired-lan] " Girish Moodalbail
2017-11-10  0:16                 ` Cong Wang
2017-11-10  0:16                   ` [Intel-wired-lan] " Cong Wang
2017-11-12 19:31         ` Linus Torvalds
2017-11-12 19:31           ` [Intel-wired-lan] " Linus Torvalds
2017-11-13  1:13           ` CONFIG_DEBUG_INFO_SPLIT impacts on faddr2line Fengguang Wu
2017-11-13  1:13             ` [Intel-wired-lan] " Fengguang Wu
2017-11-13  2:05             ` Zhang Rui
2017-11-13  2:05               ` [Intel-wired-lan] " Zhang Rui
2017-11-13  2:22               ` Fengguang Wu
2017-11-13  2:22                 ` [Intel-wired-lan] " Fengguang Wu
2017-11-13 18:52             ` Andi Kleen
2017-11-13 18:52               ` [Intel-wired-lan] " Andi Kleen
2017-11-13 19:14               ` Linus Torvalds
2017-11-13 19:14                 ` [Intel-wired-lan] " Linus Torvalds
2017-11-13 20:10                 ` Andi Kleen
2017-11-13 20:10                   ` [Intel-wired-lan] " Andi Kleen
2017-11-13 20:14                   ` H.J. Lu
2017-11-13 20:14                     ` [Intel-wired-lan] " H.J. Lu
2017-11-13 20:56                   ` Linus Torvalds
2017-11-13 20:56                     ` [Intel-wired-lan] " Linus Torvalds
2017-11-13 21:41                     ` Andi Kleen
2017-11-13 21:41                       ` [Intel-wired-lan] " Andi Kleen
2017-11-13 21:57                       ` Linus Torvalds
2017-11-13 21:57                         ` [Intel-wired-lan] " Linus Torvalds
2017-11-13 23:51                         ` Andi Kleen [this message]
2017-11-13 23:51                           ` Andi Kleen
2017-11-14  8:13               ` Fengguang Wu
2017-11-14  8:13                 ` [Intel-wired-lan] " Fengguang Wu
2017-11-09  2:43     ` [vlan_device_event] BUG: unable to handle kernel paging request at 6b6b6ccf Fengguang Wu
2017-11-09  6:48       ` Fengguang Wu

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