linux-kernel - Re: [RFC 0/5] vmalloc_exec for modules and BPF programs

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Message-ID: <4D089469-B32B-4347-A811-B1E5EE011307@fb.com>
Date:   Mon, 22 Aug 2022 15:46:38 +0000
From:   Song Liu <songliubraving@...com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     Linux-MM <linux-mm@...ck.org>, lkml <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        X86 ML <x86@...nel.org>, Christoph Hellwig <hch@....de>,
        Kernel Team <Kernel-team@...com>,
        "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>, Song Liu <song@...nel.org>
Subject: Re: [RFC 0/5] vmalloc_exec for modules and BPF programs



> On Aug 18, 2022, at 3:42 PM, Song Liu <song@...nel.org> wrote:
> 
> This set is a prototype that allows dynamic kernel text (modules, bpf
> programs, various trampolines, etc.) to share huge pages. The idea is
> similar to Peter's suggestion in [1]. Please refer to each patch for
> more detais.
> 
> The ultimate goal is to only host kernel text in 2MB pages (for x86_64).
> 
> Please share your comments on this.
> 
> Thanks!
> 
> [1] https://lore.kernel.org/bpf/Ys6cWUMHO8XwyYgr@hirez.programming.kicks-ass.net/

Hi Peter, 

Could you please share your feedback on this? 

Thanks,
Song

PS: I guess vger dropped my patch again. :( The set is also available at

https://git.kernel.org/pub/scm/linux/kernel/git/song/linux.git 

branch vmalloc_exec. 

> 
> Song Liu (5):
>  vmalloc: introduce vmalloc_exec and vfree_exec
>  bpf: use vmalloc_exec
>  modules, x86: use vmalloc_exec for module core
>  vmalloc_exec: share a huge page with kernel text
>  vmalloc: vfree_exec: free unused vm_struct
> 
> arch/x86/Kconfig              |   1 +
> arch/x86/kernel/alternative.c |  30 ++++-
> arch/x86/kernel/module.c      |   1 +
> arch/x86/mm/init_64.c         |   3 +-
> include/linux/vmalloc.h       |  16 +--
> kernel/bpf/core.c             | 155 ++------------------------
> kernel/module/main.c          |  23 ++--
> kernel/module/strict_rwx.c    |   3 -
> kernel/trace/ftrace.c         |   3 +-
> mm/nommu.c                    |   7 ++
> mm/vmalloc.c                  | 200 +++++++++++++++++++++++++++++-----
> 11 files changed, 239 insertions(+), 203 deletions(-)
> 
> --
> 2.30.2