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zram: mark incompressible page as ZRAM_HUGE

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Mark incompressible pages so that we could investigate who is the owner
of the incompressible pages once the page is swapped out via using
upcoming zram memory tracker feature.

With it, we could prevent such pages to be swapped out by using mlock.
Otherwise we might remove them.

This patch exposes new stat for huge pages via mm_stat.

Link: http://lkml.kernel.org/r/20180416090946.63057-3-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim
2018-06-07 17:05:42 -07:00
committed by Linus Torvalds
parent c4d6c4cc7b
commit 89e85bce4b
3 changed files with 17 additions and 3 deletions
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Documentation/blockdev/zram.txt
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@@ -218,6 +218,7 @@ line of text and contains the following stats separated by whitespace:
same_pages the number of same element filled pages written to this disk.
No memory is allocated for such pages.
pages_compacted the number of pages freed during compaction
huge_pages the number of incompressible pages
9) Deactivate:
swapoff /dev/zram0