VM: remove unused /proc/sys/vm/kswapd and swapctl.h

These were totally unused for a long time.  It's interesting how
many files include swapctl.h, though..

Documentation/sysctl/vm.txt

@@ -16,7 +16,6 @@ Default values and initialization routines for most of these
 files can be found in mm/swap.c.
 
 Currently, these files are in /proc/sys/vm:
-- kswapd
 - overcommit_memory
 - page-cluster
 - dirty_async_ratio
@@ -34,39 +33,6 @@ See Documentation/filesystems/proc.txt
 
 ==============================================================
 
-kswapd:
-
-Kswapd is the kernel swapout daemon. That is, kswapd is that
-piece of the kernel that frees memory when it gets fragmented
-or full. Since every system is different, you'll probably want
-some control over this piece of the system.
-
-The numbers in this page correspond to the numbers in the
-struct pager_daemon {tries_base, tries_min, swap_cluster
-}; The tries_base and swap_cluster probably have the
-largest influence on system performance.
-
-tries_base	The maximum number of pages kswapd tries to
-		free in one round is calculated from this
-		number. Usually this number will be divided
-		by 4 or 8 (see mm/vmscan.c), so it isn't as
-		big as it looks.
-		When you need to increase the bandwidth to/from
-		swap, you'll want to increase this number.
-tries_min	This is the minimum number of times kswapd
-		tries to free a page each time it is called.
-		Basically it's just there to make sure that
-		kswapd frees some pages even when it's being
-		called with minimum priority.
-swap_cluster	This is the number of pages kswapd writes in
-		one turn. You want this large so that kswapd
-		does it's I/O in large chunks and the disk
-		doesn't have to seek often, but you don't want
-		it to be too large since that would flood the
-		request queue.
-
-==============================================================
-
 overcommit_memory:
 
 This value contains a flag that enables memory overcommitment.

arch/arm/mm/init.c

@@ -18,7 +18,6 @@
 #include <linux/mman.h>
 #include <linux/mm.h>
 #include <linux/swap.h>
-#include <linux/swapctl.h>
 #include <linux/smp.h>
 #include <linux/init.h>
 #include <linux/bootmem.h>

arch/mips/mm/init.c

@@ -24,7 +24,6 @@
 #include <linux/bootmem.h>
 #include <linux/highmem.h>
 #include <linux/swap.h>
-#include <linux/swapctl.h>
 #ifdef CONFIG_BLK_DEV_INITRD
 #include <linux/blk.h>
 #endif

arch/mips64/mm/init.c

@@ -21,7 +21,6 @@
 #include <linux/bootmem.h>
 #include <linux/highmem.h>
 #include <linux/swap.h>
-#include <linux/swapctl.h>
 #ifdef CONFIG_BLK_DEV_INITRD
 #include <linux/blk.h>
 #endif

arch/sparc/mm/init.c

@@ -18,7 +18,6 @@
 #include <linux/mman.h>
 #include <linux/mm.h>
 #include <linux/swap.h>
-#include <linux/swapctl.h>
 #ifdef CONFIG_BLK_DEV_INITRD
 #include <linux/blk.h>
 #endif

arch/sparc64/mm/init.c

@@ -15,7 +15,6 @@
 #include <linux/slab.h>
 #include <linux/blk.h>
 #include <linux/swap.h>
-#include <linux/swapctl.h>
 #include <linux/pagemap.h>
 #include <linux/fs.h>
 #include <linux/seq_file.h>

fs/coda/sysctl.c

@@ -15,7 +15,6 @@
 #include <linux/time.h>
 #include <linux/mm.h>
 #include <linux/sysctl.h>
-#include <linux/swapctl.h>
 #include <linux/proc_fs.h>
 #include <linux/slab.h>
 #include <linux/stat.h>

fs/intermezzo/sysctl.c

@@ -8,7 +8,6 @@
 #include <linux/time.h>
 #include <linux/mm.h>
 #include <linux/sysctl.h>
-#include <linux/swapctl.h>
 #include <linux/proc_fs.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>

include/linux/swapctl.h

-#ifndef _LINUX_SWAPCTL_H
-#define _LINUX_SWAPCTL_H
-
-typedef struct pager_daemon_v1
-{
-	unsigned int	tries_base;
-	unsigned int	tries_min;
-	unsigned int	swap_cluster;
-} pager_daemon_v1;
-typedef pager_daemon_v1 pager_daemon_t;
-extern pager_daemon_t pager_daemon;
-
-#endif /* _LINUX_SWAPCTL_H */

include/linux/sysctl.h

@@ -136,12 +136,12 @@ enum
 	VM_UNUSED1=1,		/* was: struct: Set vm swapping control */
 	VM_UNUSED2=2,		/* was; int: Linear or sqrt() swapout for hogs */
 	VM_UNUSED3=3,		/* was: struct: Set free page thresholds */
-	VM_BDFLUSH_UNUSED=4,	/* Spare */
+	VM_UNUSED4=4,		/* Spare */
 	VM_OVERCOMMIT_MEMORY=5,	/* Turn off the virtual memory safety limit */
-	VM_UNUSED4=6,		/* was: struct: Set buffer memory thresholds */
-	VM_UNUSED5=7,		/* was: struct: Set cache memory thresholds */
-	VM_PAGERDAEMON=8,	/* struct: Control kswapd behaviour */
-	VM_UNUSED6=9,		/* was: struct: Set page table cache parameters */
+	VM_UNUSED5=6,		/* was: struct: Set buffer memory thresholds */
+	VM_UNUSED7=7,		/* was: struct: Set cache memory thresholds */
+	VM_UNUSED8=8,		/* was: struct: Control kswapd behaviour */
+	VM_UNUSED9=9,		/* was: struct: Set page table cache parameters */
 	VM_PAGE_CLUSTER=10,	/* int: set number of pages to swap together */
 	VM_DIRTY_BACKGROUND=11,	/* dirty_background_ratio */
 	VM_DIRTY_ASYNC=12,	/* dirty_async_ratio */

kernel/suspend.c

@@ -36,7 +36,6 @@
 
 #include <linux/module.h>
 #include <linux/mm.h>
-#include <linux/swapctl.h>
 #include <linux/suspend.h>
 #include <linux/smp_lock.h>
 #include <linux/file.h>

kernel/sysctl.c

@@ -22,7 +22,6 @@
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/sysctl.h>
-#include <linux/swapctl.h>
 #include <linux/proc_fs.h>
 #include <linux/ctype.h>
 #include <linux/utsname.h>
@@ -272,8 +271,6 @@ static ctl_table vm_table[] = {
 	{VM_OVERCOMMIT_RATIO, "overcommit_ratio",
 	 &sysctl_overcommit_ratio, sizeof(sysctl_overcommit_ratio), 0644,
 	 NULL, &proc_dointvec},
-	{VM_PAGERDAEMON, "kswapd",
-	 &pager_daemon, sizeof(pager_daemon_t), 0644, NULL, &proc_dointvec},
 	{VM_PAGE_CLUSTER, "page-cluster", 
 	 &page_cluster, sizeof(int), 0644, NULL, &proc_dointvec},
 	{VM_DIRTY_BACKGROUND, "dirty_background_ratio",

mm/bootmem.c

@@ -12,7 +12,6 @@
 #include <linux/mm.h>
 #include <linux/kernel_stat.h>
 #include <linux/swap.h>
-#include <linux/swapctl.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
 #include <linux/bootmem.h>

mm/memory.c

@@ -41,7 +41,6 @@
 #include <linux/mman.h>
 #include <linux/swap.h>
 #include <linux/smp_lock.h>
-#include <linux/swapctl.h>
 #include <linux/iobuf.h>
 #include <linux/highmem.h>
 #include <linux/pagemap.h>

mm/mmap.c

@@ -11,7 +11,6 @@
 #include <linux/mman.h>
 #include <linux/pagemap.h>
 #include <linux/swap.h>
-#include <linux/swapctl.h>
 #include <linux/smp_lock.h>
 #include <linux/init.h>
 #include <linux/file.h>

mm/oom_kill.c

@@ -18,7 +18,6 @@
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/swap.h>
-#include <linux/swapctl.h>
 #include <linux/timex.h>
 
 /* #define DEBUG */

mm/swap.c

@@ -16,7 +16,6 @@
 #include <linux/mm.h>
 #include <linux/kernel_stat.h>
 #include <linux/swap.h>
-#include <linux/swapctl.h>
 #include <linux/pagemap.h>
 #include <linux/init.h>
 
@@ -27,12 +26,6 @@
 /* How many pages do we try to swap or page in/out together? */
 int page_cluster;
 
-pager_daemon_t pager_daemon = {
-	512,	/* base number for calculating the number of tries */
-	SWAP_CLUSTER_MAX,	/* minimum number of tries */
-	8,	/* do swap I/O in clusters of this size */
-};
-
 /*
  * Move an inactive page to the active list.
  */

mm/swap_state.c

@@ -10,7 +10,6 @@
 #include <linux/mm.h>
 #include <linux/kernel_stat.h>
 #include <linux/swap.h>
-#include <linux/swapctl.h>
 #include <linux/init.h>
 #include <linux/pagemap.h>
 #include <linux/smp_lock.h>

mm/swapfile.c

@@ -10,7 +10,6 @@
 #include <linux/smp_lock.h>
 #include <linux/kernel_stat.h>
 #include <linux/swap.h>
-#include <linux/swapctl.h>
 #include <linux/vmalloc.h>
 #include <linux/pagemap.h>
 #include <linux/namei.h>

mm/vmscan.c

@@ -15,7 +15,6 @@
 #include <linux/slab.h>
 #include <linux/kernel_stat.h>
 #include <linux/swap.h>
-#include <linux/swapctl.h>
 #include <linux/smp_lock.h>
 #include <linux/pagemap.h>
 #include <linux/init.h>