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mm, memory_hotplug: consider offline memblocks removable

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is_pageblock_removable_nolock() relies on having zone association to
examine all the page blocks to check whether they are movable or free.
This is just wasting of cycles when the memblock is offline.  Later
patch in the series will also change the time when the page is
associated with a zone so we let's bail out early if the memblock is
offline.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Michal Hocko <[email protected]>
Reported-by: Igor Mammedov <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Daniel Kiper <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Jerome Glisse <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Reza Arbab <[email protected]>
Cc: Tobias Regnery <[email protected]>
Cc: Toshi Kani <[email protected]>
Cc: Vitaly Kuznetsov <[email protected]>
Cc: Xishi Qiu <[email protected]>
Cc: Yasuaki Ishimatsu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michal Hocko 2017-07-06 15:37:53 -07:00 • committed by Linus Torvalds
commit 8b0662f245
1 changed files with 4 additions and 0 deletions
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4
drivers/base/memory.c
View file

@ -128,6 +128,9 @@ static ssize_t show_mem_removable(struct device *dev,
int ret = 1;
struct memory_block *mem = to_memory_block(dev);
if (mem->state != MEM_ONLINE)
goto out;
for (i = 0; i < sections_per_block; i++) {
if (!present_section_nr(mem->start_section_nr + i))
continue;
@ -135,6 +138,7 @@ static ssize_t show_mem_removable(struct device *dev,
ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION);
}
out:
return sprintf(buf, "%d\n", ret);
}