linux-kernel - [PATCH v7 8/8] mm: Document the newly added mTHP zswpout stats, clarify swpout semantics.

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Message-Id: <20240924011709.7037-9-kanchana.p.sridhar@intel.com>
Date: Mon, 23 Sep 2024 18:17:09 -0700
From: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
To: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	hannes@...xchg.org,
	yosryahmed@...gle.com,
	nphamcs@...il.com,
	chengming.zhou@...ux.dev,
	usamaarif642@...il.com,
	shakeel.butt@...ux.dev,
	ryan.roberts@....com,
	ying.huang@...el.com,
	21cnbao@...il.com,
	akpm@...ux-foundation.org
Cc: nanhai.zou@...el.com,
	wajdi.k.feghali@...el.com,
	vinodh.gopal@...el.com,
	kanchana.p.sridhar@...el.com
Subject: [PATCH v7 8/8] mm: Document the newly added mTHP zswpout stats, clarify swpout semantics.

Added documentation for the newly added sysfs mTHP "zswpout" stats.

Clarified that only non-ZSWAP mTHP swapouts will be accounted in the mTHP
"swpout" stats.

Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
---
 Documentation/admin-guide/mm/transhuge.rst | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst
index cfdd16a52e39..a65f905e9ca7 100644
--- a/Documentation/admin-guide/mm/transhuge.rst
+++ b/Documentation/admin-guide/mm/transhuge.rst
@@ -530,10 +530,14 @@ anon_fault_fallback_charge
 	instead falls back to using huge pages with lower orders or
 	small pages even though the allocation was successful.
 
-swpout
-	is incremented every time a huge page is swapped out in one
+zswpout
+	is incremented every time a huge page is swapped out to ZSWAP in one
 	piece without splitting.
 
+swpout
+	is incremented every time a huge page is swapped out to a non-ZSWAP
+	swap entity in one piece without splitting.
+
 swpout_fallback
 	is incremented if a huge page has to be split before swapout.
 	Usually because failed to allocate some continuous swap space
-- 
2.27.0