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docs: cgroup-v1: correct the term of Page Cache organization in inode

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The radix-tree for Page Cache has been replaced with xarray, see
commit eb797a8ee0 ("page cache: Rearrange address_space"), so move
"radix-tree" to "xarray".

Signed-off-by: Xiongwei Song <xiongwei.song@windriver.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Xiongwei Song 2023-07-21 13:49:37 +08:00 committed by Tejun Heo
parent 714e08cc3e
commit fe9ebb8cec
1 changed files with 2 additions and 2 deletions
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Documentation/admin-guide/cgroup-v1/memory.rst
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@ -197,11 +197,11 @@ are not accounted. We just account pages under usual VM management.
RSS pages are accounted at page_fault unless they've already been accounted
for earlier. A file page will be accounted for as Page Cache when it's
inserted into inode (radix-tree). While it's mapped into the page tables of
inserted into inode (xarray). While it's mapped into the page tables of
processes, duplicate accounting is carefully avoided.
An RSS page is unaccounted when it's fully unmapped. A PageCache page is
unaccounted when it's removed from radix-tree. Even if RSS pages are fully
unaccounted when it's removed from xarray. Even if RSS pages are fully
unmapped (by kswapd), they may exist as SwapCache in the system until they
are really freed. Such SwapCaches are also accounted.
A swapped-in page is accounted after adding into swapcache.