linux-kernel - [PATCH 2.6.25-rc2 8/9] Kconfig: Improve init/Kconfig help descriptions

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Date:	Fri, 22 Feb 2008 11:58:19 +1100
From:	Nick Andrew <nick@...k-andrew.net>
To:	trivial@...nel.org
Cc:	linux-kernel@...r.kernel.org, Pavel Emelyanov <xemul@...nvz.org>,
	Serge Hallyn <serue@...ibm.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Paul Menage <menage@...gle.com>, Paul Jackson <pj@....com>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>
Subject: [PATCH 2.6.25-rc2 8/9] Kconfig: Improve init/Kconfig help descriptions - SLAB

Rewrite the help descriptions for clarity, accuracy and consistency.

Kernel config options affected:

  - SLUB_DEBUG
  - SLAB
  - SLUB
  - SLOB

Signed-off-by: Nick Andrew <nick@...k-andrew.net>
---
Try #3.

--- a/init/Kconfig	2008-02-20 09:34:48.000000000 +1100
+++ b/init/Kconfig	2008-02-20 09:50:54.000000000 +1100
@@ -683,31 +683,48 @@ config SLUB_DEBUG
 	bool "Enable SLUB debugging support" if EMBEDDED
 	depends on SLUB
 	help
+	  Enable debugging on the "SLUB" slab allocator.
+
 	  SLUB has extensive debug support features. Disabling these can
 	  result in significant savings in code size. This also disables
 	  SLUB sysfs support. /sys/slab will not exist and there will be
 	  no support for cache validation etc.
 
+	  If unsure, say N.
+
 choice
 	prompt "Choose SLAB allocator"
 	default SLUB
 	help
-	   This option allows to select a slab allocator.
+	   This option selects a slab allocator.
+
+	   A slab is a contiguous area of kernel memory. Slabs are of
+	   fixed size (1 or more times the page size) and are used as
+	   the container for allocation of kernel data structures. This
+	   reduces memory fragmentation and makes allocation very fast,
+	   improving kernel performance.
+
+	   "SLUB" is the default slab allocator.
+
+	   See wikipedia:Slab_allocation for more details.
 
 config SLAB
 	bool "SLAB"
 	help
-	  The regular slab allocator that is established and known to work
-	  well in all environments. It organizes cache hot objects in
-	  per cpu and per node queues. SLAB is the default choice for
-	  a slab allocator.
+	  SLAB is the original slab allocator that is established and
+	  known to work well in all environments. It organizes cache
+	  hot objects in per-CPU and per-node queues.
+
+	  SLAB has been superseded by SLUB.
 
 config SLUB
 	bool "SLUB (Unqueued Allocator)"
 	help
 	   SLUB is a slab allocator that minimizes cache line usage
-	   instead of managing queues of cached objects (SLAB approach).
-	   Per cpu caching is realized using slabs of objects instead
+	   instead of managing queues of cached objects (the SLAB
+	   approach).
+
+	   Per-CPU caching is realized using slabs of objects instead
 	   of queues of objects. SLUB can use memory efficiently
 	   and has enhanced diagnostics.
 
@@ -715,9 +732,11 @@ config SLOB
 	depends on EMBEDDED
 	bool "SLOB (Simple Allocator)"
 	help
-	   SLOB replaces the stock allocator with a drastically simpler
-	   allocator. SLOB is generally more space efficient but
-	   does not perform as well on large systems.
+	   SLOB is a drastically simpler allocator for use in embedded
+	   systems.
+
+	   SLOB is generally more space efficient but does not perform
+	   as well on large systems.
 
 endchoice
 
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