linux-kernel - [PATCH] mm/Kconfig: correct description of DEFERRED_STRUCT_PAGE

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Date:	Thu, 28 Jan 2016 16:37:28 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Mel Gorman <mgorman@...hsingularity.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH] mm/Kconfig: correct description of DEFERRED_STRUCT_PAGE_INIT

The description mentions kswapd threads, while the deferred struct page
initialization is actually done by one-off "pgdatinitX" threads. Fix the
description so that potentially users are not confused about pgdatinit threads
using CPU after boot instead of kswapd.

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 mm/Kconfig | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 97a4e06b15c0..03cbfa072f42 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -624,7 +624,7 @@ config ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
 	bool
 
 config DEFERRED_STRUCT_PAGE_INIT
-	bool "Defer initialisation of struct pages to kswapd"
+	bool "Defer initialisation of struct pages to kthreads"
 	default n
 	depends on ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
 	depends on MEMORY_HOTPLUG
@@ -633,9 +633,10 @@ config DEFERRED_STRUCT_PAGE_INIT
 	  single thread. On very large machines this can take a considerable
 	  amount of time. If this option is set, large machines will bring up
 	  a subset of memmap at boot and then initialise the rest in parallel
-	  when kswapd starts. This has a potential performance impact on
-	  processes running early in the lifetime of the systemm until kswapd
-	  finishes the initialisation.
+	  by starting one-off "pgdatinitX" kernel thread for each node X. This
+	  has a potential performance impact on processes running early in the
+	  lifetime of the system until these kthreads finish the
+	  initialisation.
 
 config IDLE_PAGE_TRACKING
 	bool "Enable idle page tracking"
-- 
2.7.0