linux-kernel - Re: [PATCH v2 bpf 0/3] vmalloc: bpf: introduce VM_ALLOW_HUGE

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Date:   Tue, 12 Apr 2022 08:38:39 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Song Liu <song@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, kernel-team@...com, akpm@...ux-foundation.org,
        rick.p.edgecombe@...el.com, hch@...radead.org,
        imbrenda@...ux.ibm.com
Subject: Re: [PATCH v2 bpf 0/3] vmalloc: bpf: introduce VM_ALLOW_HUGE_VMAP

On Mon, Apr 11, 2022 at 04:18:05PM -0700, Song Liu wrote:
> Changes v1 => v2:
> 1. Add vmalloc_huge(). (Christoph Hellwig)
> 2. Add module_alloc_huge(). (Christoph Hellwig)
> 3. Add Fixes tag and Link tag. (Thorsten Leemhuis)
> 
> Enabling HAVE_ARCH_HUGE_VMALLOC on x86_64 and use it for bpf_prog_pack has
> caused some issues [1], as many users of vmalloc are not yet ready to
> handle huge pages. To enable a more smooth transition to use huge page
> backed vmalloc memory, this set replaces VM_NO_HUGE_VMAP flag with an new
> opt-in flag, VM_ALLOW_HUGE_VMAP. More discussions about this topic can be
> found at [2].
> 
> Patch 1 removes VM_NO_HUGE_VMAP and adds VM_ALLOW_HUGE_VMAP.
> Patch 2 uses VM_ALLOW_HUGE_VMAP in bpf_prog_pack.
> 
> [1] https://lore.kernel.org/lkml/20220204185742.271030-1-song@kernel.org/
> [2] https://lore.kernel.org/linux-mm/20220330225642.1163897-1-song@kernel.org/
> 
> Song Liu (3):
>   vmalloc: replace VM_NO_HUGE_VMAP with VM_ALLOW_HUGE_VMAP
>   module: introduce module_alloc_huge
>   bpf: use vmalloc with VM_ALLOW_HUGE_VMAP for bpf_prog_pack
> 
>  arch/Kconfig                 |  6 ++----
>  arch/powerpc/kernel/module.c |  2 +-
>  arch/s390/kvm/pv.c           |  2 +-
>  arch/x86/kernel/module.c     | 21 +++++++++++++++++++
>  include/linux/moduleloader.h |  5 +++++
>  include/linux/vmalloc.h      |  4 ++--
>  kernel/bpf/core.c            |  9 +++++----
>  kernel/module.c              |  8 ++++++++

Please use modules-next [0] as that has queued up changes which change
kernel/module.c quite a bit.

[0] https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git/log/?h=modules-next

 Luis