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

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Message-ID: <CAHk-=wh6um5AFR6TObsYY0v+jUSZxReiZM_5Kh4gAMU8Z8-jVw@mail.gmail.com>
Date:   Tue, 19 Apr 2022 12:20:39 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Song Liu <songliubraving@...com>,
        "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        "mcgrof@...nel.org" <mcgrof@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "hch@...radead.org" <hch@...radead.org>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "song@...nel.org" <song@...nel.org>,
        Kernel Team <Kernel-team@...com>,
        "pmladek@...e.com" <pmladek@...e.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "dborkman@...hat.com" <dborkman@...hat.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "bp@...en8.de" <bp@...en8.de>, "mbenes@...e.cz" <mbenes@...e.cz>,
        "imbrenda@...ux.ibm.com" <imbrenda@...ux.ibm.com>
Subject: Re: [PATCH v4 bpf 0/4] vmalloc: bpf: introduce VM_ALLOW_HUGE_VMAP

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.

                      Linus