linux-kernel - Re: [PATCH v1 0/4] powernv/memtrace: don't abuse memory hot(un)plug infrastructure for memory allocations

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Message-Id: <160630540200.2174375.9298673276341715348.b4-ty@ellerman.id.au>
Date:   Wed, 25 Nov 2020 22:57:45 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     linux-kernel@...r.kernel.org, David Hildenbrand <david@...hat.com>
Cc:     Rashmica Gupta <rashmica.g@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        Oscar Salvador <osalvador@...e.de>, linux-mm@...ck.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v1 0/4] powernv/memtrace: don't abuse memory hot(un)plug infrastructure for memory allocations

On Thu, 29 Oct 2020 17:27:14 +0100, David Hildenbrand wrote:
> powernv/memtrace is the only in-kernel user that rips out random memory
> it never added (doesn't own) in order to allocate memory without a
> linear mapping. Let's stop abusing memory hot(un)plug infrastructure for
> that - use alloc_contig_pages() for allocating memory and remove the
> linear mapping manually.
> 
> The original idea was discussed in:
>  https://lkml.kernel.org/r/48340e96-7e6b-736f-9e23-d3111b915b6e@redhat.com
> 
> [...]

Applied to powerpc/next.

[1/4] powerpc/mm: factor out creating/removing linear mapping
      https://git.kernel.org/powerpc/c/4abb1e5b63ac3281275315fc6b0cde0b9c2e2e42
[2/4] powerpc/mm: print warning in arch_remove_linear_mapping()
      https://git.kernel.org/powerpc/c/1f73ad3e8d755dbec52fcec98618a7ce4de12af2
[3/4] powerpc/mm: remove linear mapping if __add_pages() fails in arch_add_memory()
      https://git.kernel.org/powerpc/c/ca2c36cae9d48b180ea51259e35ab3d95d327df2
[4/4] powernv/memtrace: don't abuse memory hot(un)plug infrastructure for memory allocations
      https://git.kernel.org/powerpc/c/0bd4b96d99108b7ea9bac0573957483be7781d70

cheers