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author | David Hildenbrand <david@redhat.com> | 2020-10-16 05:07:46 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-16 20:11:17 +0200 |
commit | 73a11c9658577d876d4c70730719feab3fa328b0 (patch) | |
tree | 9a235df77af064ed625bc1558306170ed40def9e /mm/memory_hotplug.c | |
parent | mm/mmu_notifier: fix mmget() assert in __mmu_interval_notifier_insert (diff) | |
download | linux-73a11c9658577d876d4c70730719feab3fa328b0.tar.xz linux-73a11c9658577d876d4c70730719feab3fa328b0.zip |
mm/memory_hotplug: inline __offline_pages() into offline_pages()
Patch series "mm/memory_hotplug: online_pages()/offline_pages() cleanups", v2.
These are a bunch of cleanups for online_pages()/offline_pages() and
related code, mostly getting rid of memory hole handling that is no longer
necessary. There is only a single walk_system_ram_range() call left in
offline_pages(), to make sure we don't have any memory holes. I had some
of these patches lying around for a longer time but didn't have time to
polish them.
In addition, the last patch marks all pageblocks of memory to get onlined
MIGRATE_ISOLATE, so pages that have just been exposed to the buddy cannot
get allocated before onlining is complete. Once heavy lifting is done,
the pageblocks are set to MIGRATE_MOVABLE, such that allocations are
possible.
I played with DIMMs and virtio-mem on x86-64 and didn't spot any
surprises. I verified that the numer of isolated pageblocks is correctly
handled when onlining/offlining.
This patch (of 10):
There is only a single user, offline_pages(). Let's inline, to make
it look more similar to online_pages().
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Charan Teja Reddy <charante@codeaurora.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Link: https://lkml.kernel.org/r/20200819175957.28465-1-david@redhat.com
Link: https://lkml.kernel.org/r/20200819175957.28465-2-david@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r-- | mm/memory_hotplug.c | 16 |
1 files changed, 5 insertions, 11 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 8e9e2d44cdad..ba201ab4c0e4 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1484,11 +1484,10 @@ static int count_system_ram_pages_cb(unsigned long start_pfn, return 0; } -static int __ref __offline_pages(unsigned long start_pfn, - unsigned long end_pfn) +int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) { - unsigned long pfn, nr_pages = 0; - unsigned long offlined_pages = 0; + const unsigned long end_pfn = start_pfn + nr_pages; + unsigned long pfn, system_ram_pages = 0, offlined_pages = 0; int ret, node, nr_isolate_pageblock; unsigned long flags; struct zone *zone; @@ -1505,9 +1504,9 @@ static int __ref __offline_pages(unsigned long start_pfn, * memory holes PG_reserved, don't need pfn_valid() checks, and can * avoid using walk_system_ram_range() later. */ - walk_system_ram_range(start_pfn, end_pfn - start_pfn, &nr_pages, + walk_system_ram_range(start_pfn, nr_pages, &system_ram_pages, count_system_ram_pages_cb); - if (nr_pages != end_pfn - start_pfn) { + if (system_ram_pages != nr_pages) { ret = -EINVAL; reason = "memory holes"; goto failed_removal; @@ -1656,11 +1655,6 @@ failed_removal: return ret; } -int offline_pages(unsigned long start_pfn, unsigned long nr_pages) -{ - return __offline_pages(start_pfn, start_pfn + nr_pages); -} - static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) { int ret = !is_memblock_offlined(mem); |