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doc: proc: fix the description to THPeligible

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The THPeligible bit shows 1 if and only if the VMA is eligible for
allocating THP and the THP is also PMD mappable.  Some misaligned file
VMAs may be eligible for allocating THP but the THP can't be mapped by
PMD.  Make this more explicitly to avoid ambiguity.

Link: https://lkml.kernel.org/r/20220616174840.1202070-8-shy828301@gmail.com
Signed-off-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: Zach O'Keefe <zokeefe@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Yang Shi 2022-06-16 10:48:40 -07:00 committed by akpm
parent 1064026bab
commit cb55b83862
1 changed files with 3 additions and 1 deletions
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Documentation/filesystems/proc.rst
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@ -517,8 +517,10 @@ replaced by copy-on-write) part of the underlying shmem object out on swap.
"SwapPss" shows proportional swap share of this mapping. Unlike "Swap", this
does not take into account swapped out page of underlying shmem objects.
"Locked" indicates whether the mapping is locked in memory or not.
"THPeligible" indicates whether the mapping is eligible for allocating THP
pages - 1 if true, 0 otherwise. It just shows the current status.
pages as well as the THP is PMD mappable or not - 1 if true, 0 otherwise.
It just shows the current status.
"VmFlags" field deserves a separate description. This member represents the
kernel flags associated with the particular virtual memory area in two letter