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From: Adam Ford <aford173@gmail.com>
To: u-boot@lists.denx.de
Subject: [RFC PATCH u-boot 00/12] U-Boot LTO (Sandbox + ARM Nokia RX-51)
Date: Thu, 4 Mar 2021 07:59:26 -0600	[thread overview]
Message-ID: <CAHCN7x+xGWfUXoxONR3iqOmFdOWbSxV9SdV7hs3_nu00H4J6Pw@mail.gmail.com> (raw)
In-Reply-To: <20210304145016.61ab7fe9@nic.cz>

On Thu, Mar 4, 2021 at 7:50 AM Marek Behun <marek.behun@nic.cz> wrote:
>
> On Thu, 4 Mar 2021 07:46:18 -0600
> Adam Ford <aford173@gmail.com> wrote:
>
> > On Thu, Mar 4, 2021 at 4:43 AM Marek Behun <marek.behun@nic.cz> wrote:
> > >
> > > On Wed, 3 Mar 2021 16:36:05 -0500
> > > Tom Rini <trini@konsulko.com> wrote:
> > >
> > > > So, as I start testing things locally with two additional changes (1.
> > > > LTO by default 2. No ffunction/data-sections with LTO) we see:
> > > > https://gist.github.com/trini/350ab850c42293563228b8d68a1bb89a
> > > > as the detailed size reduction.  This also shows that with LTO we want
> > > > to turn off -ffunction-sections/etc as it's not useful now.
> > >
> > > Tom, I have pushed another version to github PR to trigger CI, and am
> > > still working on clang. You can look at the github PR if you want to
> > > try yourself. I have also added patch that disables
> > > -ffunction-section/fdata-section on arm.
> > >
> > > After I manage to make it all work in CI I will send v2 to mailing list.
> >
> > I tested this with the imx6q_logic board.  I only tested the U-Boot
> > portion, but it appeared to work and it booted the kernel.  The U-Boot
> > size reduced -7182 bytes (about 3% smaller).
> >
> > I haven't been able to successfully boot the OMAP3 boards I have yet.
> > I'm still looking into this.
> >
> > I don't think we should enable LTO by default for all boards yet.
>
> Adam, did you try the current version from github.com/elkablo/u-boot
> branch lto ?

Not yet.  The SPL issue that I am fighting appears to be a regression
in master somewhere between 2020.04-rc1 and the current head.  I want
to resolve that issue before I get back to re-testing the LTO stuff.
I don't really have time to git bisect now, but I'll try to work on it
this weekend.  This is very exciting to me because of the very limited
SPL space in several of my 32-bit ARM boards.  From my build-only
tests, my SPL sizes are shrinking 10-20% with LTO enabled depending on
the board.

Thank you for the work you've done.

adam

  reply	other threads:[~2021-03-04 13:59 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-03  4:11 [RFC PATCH u-boot 00/12] U-Boot LTO (Sandbox + ARM Nokia RX-51) Marek Behún
2021-03-03  4:12 ` [RFC PATCH u-boot 01/12] build: use thin archives instead of incremental linking Marek Behún
2021-03-04 10:57   ` Bin Meng
2021-03-04 18:17     ` Marek Behun
2021-03-05 13:34       ` Bin Meng
2021-03-05 13:37         ` Tom Rini
2021-03-06 21:20           ` Marek Behun
2021-03-05 15:39         ` Marek Behun
2021-03-03  4:12 ` [RFC PATCH u-boot 02/12] sandbox: errno: avoid conflict with libc's errno Marek Behún
2021-03-05  3:00   ` Bin Meng
2021-03-05 15:37     ` Marek Behun
2021-03-05 16:39       ` Simon Glass
2021-03-05 16:50         ` Marek Behun
2021-03-05 16:58           ` Simon Glass
2021-03-05 17:24             ` Heinrich Schuchardt
2021-03-05 17:24             ` Marek Behun
2021-03-05 19:42               ` Simon Glass
2021-03-05 17:21       ` Heinrich Schuchardt
2021-03-07  3:14         ` Marek Behun
2021-03-12  4:45   ` Simon Glass
2021-03-03  4:12 ` [RFC PATCH u-boot 03/12] linker_lists: declare entries and lists externally visible Marek Behún
2021-03-04 13:47   ` Marek Behun
2021-03-05  3:04   ` Bin Meng
2021-03-05 15:49     ` Marek Behun
2021-03-03  4:12 ` [RFC PATCH u-boot 04/12] efi_loader: fix warning when linking with LTO Marek Behún
2021-03-05  5:50   ` Bin Meng
2021-03-03  4:12 ` [RFC PATCH u-boot 05/12] binman: declare symbols externally visible Marek Behún
2021-03-04  0:37   ` Tom Rini
2021-03-04  1:53     ` Marek Behun
2021-03-03  4:12 ` [RFC PATCH u-boot 06/12] build: support building with Link Time Optimizations Marek Behún
2021-03-05  6:34   ` Bin Meng
2021-03-03  4:12 ` [RFC PATCH u-boot 07/12] arch: sandbox: make LTO available Marek Behún
2021-03-03  4:12 ` [RFC PATCH u-boot 08/12] sandbox: build with LTO Marek Behún
2021-03-03  4:12 ` [RFC PATCH u-boot 09/12] ARM: make gd a function for LTO Marek Behún
2021-03-03  4:12 ` [RFC PATCH u-boot 10/12] string: make memcpy() visible to fix LTO linking errors Marek Behún
2021-03-03  4:12 ` [RFC PATCH u-boot 11/12] arch: ARM: make LTO available Marek Behún
2021-03-03  4:12 ` [RFC PATCH u-boot 12/12] Nokia RX-51: build with LTO Marek Behún
2021-03-03 16:11 ` [RFC PATCH u-boot 00/12] U-Boot LTO (Sandbox + ARM Nokia RX-51) Tom Rini
2021-03-03 16:41   ` Marek Behun
2021-03-03 16:47     ` Tom Rini
2021-03-03 21:36     ` Tom Rini
2021-03-04  0:40       ` Adam Ford
2021-03-04  7:07         ` [PATCH] arm: fix LTO build for some thumb-interwork cases Marek Behún
2021-03-04 10:43       ` [RFC PATCH u-boot 00/12] U-Boot LTO (Sandbox + ARM Nokia RX-51) Marek Behun
2021-03-04 13:46         ` Adam Ford
2021-03-04 13:50           ` Marek Behun
2021-03-04 13:59             ` Adam Ford [this message]
2021-03-04 14:58           ` Tom Rini
2021-03-04 15:07             ` Adam Ford
2021-03-04 15:37               ` Marek Behun
2021-03-04 16:18                 ` Tom Rini
2021-03-04 15:59               ` Marek Behun
2021-03-04 22:18                 ` Adam Ford
2021-03-04 22:33                   ` Marek Behun
2021-03-05 11:25                     ` Adam Ford
2021-03-05 12:31                       ` Stefan Roese
2021-03-05 17:10                         ` Adam Ford
2021-03-06  3:03                           ` Adam Ford
2021-03-06 11:12                             ` Adam Ford
2021-03-06 17:37                               ` Marek Behun
2021-03-06 20:08                                 ` Tom Rini
2021-03-06 20:41                                   ` Pali Rohár
2021-03-06 20:54                                     ` Marek Behun
2021-03-06 21:00                                       ` Pali Rohár
2021-03-06 21:19                                         ` Marek Behun
2021-03-06 21:38                                           ` Pali Rohár
2021-03-06 21:49                                             ` Marek Behun
2021-03-07  3:45                                               ` Adam Ford
2021-03-07  4:06                                                 ` Marek Behun
2021-05-09 14:14                                                   ` Adam Ford
2021-05-09 18:44                                                     ` Marek Behun
2021-05-10 16:28                                                       ` Simon Glass
2021-05-13  9:22                                                         ` Pali Rohár
2021-03-04 16:17               ` Tom Rini
2021-03-04 16:35                 ` Pali Rohár

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