linux-kernel - [PATCH -mm] mm, THP, doc: Add document for thp_swpout/thp_swpout

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Message-Id: <20180509082341.13953-1-ying.huang@intel.com>
Date:   Wed,  9 May 2018 16:23:41 +0800
From:   "Huang, Ying" <ying.huang@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>
Cc:     linux-mm@...ck.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Huang Ying <ying.huang@...el.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH -mm] mm, THP, doc: Add document for thp_swpout/thp_swpout_fallback

From: Huang Ying <ying.huang@...el.com>

Add document for newly added thp_swpout, thp_swpout_fallback fields in
/proc/vmstat.

Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Johannes Weiner <hannes@...xchg.org>
---
 Documentation/vm/transhuge.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/vm/transhuge.rst b/Documentation/vm/transhuge.rst
index 569d182cc973..2c6867fca6ff 100644
--- a/Documentation/vm/transhuge.rst
+++ b/Documentation/vm/transhuge.rst
@@ -355,6 +355,15 @@ thp_zero_page_alloc_failed
 	is incremented if kernel fails to allocate
 	huge zero page and falls back to using small pages.
 
+thp_swpout
+	is incremented every time a huge page is swapout in one
+	piece without splitting.
+
+thp_swpout_fallback
+	is incremented if a huge page has to be split before swapout.
+	Usually because failed to allocate some continuous swap space
+	for the huge page.
+
 As the system ages, allocating huge pages may be expensive as the
 system uses memory compaction to copy data around memory to free a
 huge page for use. There are some counters in ``/proc/vmstat`` to help
-- 
2.16.1