linux-kernel - Re: [PATCH v2 0/8] objtool: reduce maximum memory usage

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Date:   Sun, 29 Jan 2023 21:43:39 +0000
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/8] objtool: reduce maximum memory usage

On Tue, Dec 27, 2022 at 04:00:57PM +0000, Thomas Weißschuh wrote:
> The processing of vmlinux.o with objtool is the most memory-intensive step
> of a kernel build. By reducing the maximum memory usage here we can reduce
> the maximum memory usage of the whole kernel build.
> Therefore memory pressure on memory starved machines is relieved during
> kernel builds and the build is faster as less swapping has to occur.

Friendly ping.

These patches can also applied one by one, the only dependency is from
patch 5 to patch 4.

Thanks,
Thomas

> To: Josh Poimboeuf <jpoimboe@...nel.org>
> To: Peter Zijlstra <peterz@...radead.org>
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> 
> ---
> Changes in v2:
> - Warn on out of range values for reloc->type
> - Also reduce size of struct special_alt
> - Note: v1 did not make it to the lists, only to individual recipients
> 
> ---
> Thomas Weißschuh (8):
>       objtool: make struct entries[] static and const
>       objtool: make struct check_options static
>       objtool: allocate multiple structures with calloc()
>       objtool: introduce function elf_reloc_set_type
>       objtool: reduce memory usage of struct reloc
>       objtool: optimize layout of struct symbol
>       objtool: optimize layout of struct special_alt
>       objtool: explicitly cleanup resources on success
> 
>  tools/objtool/builtin-check.c           |  4 ++-
>  tools/objtool/check.c                   |  6 ++--
>  tools/objtool/elf.c                     | 56 +++++++++++++++++++--------------
>  tools/objtool/include/objtool/builtin.h |  2 --
>  tools/objtool/include/objtool/elf.h     | 13 +++++---
>  tools/objtool/include/objtool/special.h |  2 +-
>  tools/objtool/special.c                 |  6 ++--
>  7 files changed, 51 insertions(+), 38 deletions(-)
> ---
> base-commit: 1b929c02afd37871d5afb9d498426f83432e71c2
> change-id: 20221216-objtool-memory-06db3b8bf111
> 
> Best regards,
> -- 
> Thomas Weißschuh <linux@...ssschuh.net>