linux-kernel - Re: [PATCH v4 bpf 0/4] vmalloc: bpf: introduce VM_ALLOW_HUGE

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Date:   Thu, 21 Apr 2022 13:25:11 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Mike Rapoport <rppt@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "ast@...nel.org" <ast@...nel.org>, "bp@...en8.de" <bp@...en8.de>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "dborkman@...hat.com" <dborkman@...hat.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "hch@...radead.org" <hch@...radead.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "imbrenda@...ux.ibm.com" <imbrenda@...ux.ibm.com>,
        Kernel Team <Kernel-team@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "mbenes@...e.cz" <mbenes@...e.cz>,
        "mcgrof@...nel.org" <mcgrof@...nel.org>,
        "pmladek@...e.com" <pmladek@...e.com>,
        "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        "song@...nel.org" <song@...nel.org>,
        Song Liu <songliubraving@...com>
Subject: Re: [PATCH v4 bpf 0/4] vmalloc: bpf: introduce VM_ALLOW_HUGE_VMAP

Excerpts from Linus Torvalds's message of April 20, 2022 5:20 am:
> On Tue, Apr 19, 2022 at 11:42 AM Mike Rapoport <rppt@...nel.org> wrote:
>>
>> I'd say that bpf_prog_pack was a cure for symptoms and this project tries
>> to address more general problem.
>> But you are right, it'll take some time and won't land in 5.19.
> 
> Just to update people: I've just applied Song's [1/4] patch, which
> means that the whole current hugepage vmalloc thing is effectively
> disabled (because nothing opts in).
> 
> And I suspect that will be the status for 5.18, unless somebody comes
> up with some very strong arguments for (re-)starting using huge pages.

Why not just revert fac54e2bfb5b ?

Thanks,
Nick