zsmalloc: document freeable stats

commit 618a8a917dbf5830e2064d2fa0568940eb5d2584 upstream.

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: 1120ed548394 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/mm/zsmalloc.rst b/Documentation/mm/zsmalloc.rst
index 6e79893..d98607a 100644 (file)
--- a/Documentation/mm/zsmalloc.rst
+++ b/Documentation/mm/zsmalloc.rst
@@ -68,6 +68,8 @@ 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
 
 We assign a zspage to ZS_ALMOST_EMPTY fullness group when n <= N / f, where