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Date: Thu, 29 Oct 2020 17:27:14 +0100 From: David Hildenbrand <david@...hat.com> To: linux-kernel@...r.kernel.org Cc: linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org, David Hildenbrand <david@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Michael Ellerman <mpe@...erman.id.au>, Michal Hocko <mhocko@...nel.org>, Michal Hocko <mhocko@...e.com>, Mike Rapoport <rppt@...nel.org>, Oscar Salvador <osalvador@...e.de>, Paul Mackerras <paulus@...ba.org>, Rashmica Gupta <rashmica.g@...il.com>, Wei Yang <richard.weiyang@...ux.alibaba.com> Subject: [PATCH v1 0/4] powernv/memtrace: don't abuse memory hot(un)plug infrastructure for memory allocations 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 I only tested allocations briefly via QEMU TCG - see patch #4 for more details. David Hildenbrand (4): powerpc/mm: factor out creating/removing linear mapping powerpc/mm: print warning in arch_remove_linear_mapping() powerpc/mm: remove linear mapping if __add_pages() fails in arch_add_memory() powernv/memtrace: don't abuse memory hot(un)plug infrastructure for memory allocations arch/powerpc/mm/mem.c | 48 +++++--- arch/powerpc/platforms/powernv/Kconfig | 8 +- arch/powerpc/platforms/powernv/memtrace.c | 134 ++++++++-------------- include/linux/memory_hotplug.h | 3 + 4 files changed, 86 insertions(+), 107 deletions(-) -- 2.26.2
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