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zsmalloc: document freeable stats 

When freeable class stat was added to classes file (back in 2016) we
forgot to update zsmalloc documentation.  Fix that.

Link: https://lkml.kernel.org/r/20230325024631.2817153-3-senozhatsky@chromium.org
Fixes: 1120ed5483 ("mm/zsmalloc: add `freeable' column to pool stat")
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky 2023-03-25 11:46:31 +09:00 committed by Andrew Morton
parent 119b57eaf0
commit 618a8a917d
1 changed files with 2 additions and 0 deletions
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Documentation/mm/zsmalloc.rst
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@ -83,6 +83,8 @@ pages_used
the number of pages allocated for the class
pages_per_zspage
the number of 0-order pages to make a zspage
freeable
the approximate number of pages class compaction can free
Each zspage maintains inuse counter which keeps track of the number of
objects stored in the zspage. The inuse counter determines the zspage's