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Subject[patch] mm-cleanup-2 (2.4.0)
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Date
OK, take two. This patch:

o removes obsolete /proc entryes and other mm structures not used
anymore.
o adds new /proc/sys/vm/max-async-pages
o updates documentation

As the patch doesn't change any kernel vital functionality it is
completely safe. I don't know if it satisfies Linus' patch submitting
guidelines. So sent only to the lists to be on the safe side. :)


Index: 0.2/mm/oom_kill.c
--- 0.2/mm/oom_kill.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/0_oom_kill.c 1.1 644)
+++ 0.10/mm/oom_kill.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/0_oom_kill.c 1.2 644)
@@ -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 */
Index: 0.2/mm/bootmem.c
--- 0.2/mm/bootmem.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/3_bootmem.c 1.1 644)
+++ 0.10/mm/bootmem.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/3_bootmem.c 1.2 644)
@@ -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>
Index: 0.2/mm/swap_state.c
--- 0.2/mm/swap_state.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/6_swap_state 1.1 644)
+++ 0.10/mm/swap_state.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/6_swap_state 1.2 644)
@@ -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>
Index: 0.2/mm/swapfile.c
--- 0.2/mm/swapfile.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/8_swapfile.c 1.1 644)
+++ 0.10/mm/swapfile.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/8_swapfile.c 1.2 644)
@@ -9,7 +9,6 @@
#include <linux/smp_lock.h>
#include <linux/kernel_stat.h>
#include <linux/swap.h>
-#include <linux/swapctl.h>
#include <linux/blkdev.h> /* for blk_size */
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
Index: 0.2/mm/vmscan.c
--- 0.2/mm/vmscan.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/9_vmscan.c 1.1 644)
+++ 0.10/mm/vmscan.c Tue, 09 Jan 2001 01:39:38 +0100 zcalusic (linux24/j/9_vmscan.c 1.4 644)
@@ -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>
Index: 0.2/mm/page_io.c
--- 0.2/mm/page_io.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/10_page_io.c 1.1 644)
+++ 0.10/mm/page_io.c Tue, 09 Jan 2001 01:31:18 +0100 zcalusic (linux24/j/10_page_io.c 1.4 644)
@@ -14,7 +14,6 @@
#include <linux/kernel_stat.h>
#include <linux/swap.h>
#include <linux/locks.h>
-#include <linux/swapctl.h>

#include <asm/pgtable.h>

@@ -43,8 +42,7 @@
struct inode *swapf = 0;

/* Don't allow too many pending pages in flight.. */
- if ((rw == WRITE) && atomic_read(&nr_async_pages) >
- pager_daemon.swap_cluster * (1 << page_cluster))
+ if ((rw == WRITE) && atomic_read(&nr_async_pages) > max_async_pages)
wait = 1;

if (rw == READ) {
Index: 0.2/mm/filemap.c
--- 0.2/mm/filemap.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/12_filemap.c 1.1 644)
+++ 0.10/mm/filemap.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/12_filemap.c 1.2 644)
@@ -18,7 +18,6 @@
#include <linux/smp_lock.h>
#include <linux/blkdev.h>
#include <linux/file.h>
-#include <linux/swapctl.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/mm.h>
Index: 0.2/mm/page_alloc.c
--- 0.2/mm/page_alloc.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/14_page_alloc 1.1 644)
+++ 0.10/mm/page_alloc.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/14_page_alloc 1.2 644)
@@ -12,7 +12,6 @@
#include <linux/config.h>
#include <linux/mm.h>
#include <linux/swap.h>
-#include <linux/swapctl.h>
#include <linux/interrupt.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
Index: 0.2/mm/mmap.c
--- 0.2/mm/mmap.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/16_mmap.c 1.1 644)
+++ 0.10/mm/mmap.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/16_mmap.c 1.2 644)
@@ -8,7 +8,6 @@
#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>
Index: 0.2/mm/swap.c
--- 0.2/mm/swap.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/17_swap.c 1.1 644)
+++ 0.10/mm/swap.c Tue, 09 Jan 2001 01:31:18 +0100 zcalusic (linux24/j/17_swap.c 1.5 644)
@@ -10,13 +10,11 @@
* linux/Documentation/sysctl/vm.txt.
* Started 18.12.91
* Swap aging added 23.2.95, Stephen Tweedie.
- * Buffermem limits added 12.3.98, Rik van Riel.
*/

#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>

@@ -42,6 +40,13 @@
/* How many pages do we try to swap or page in/out together? */
int page_cluster;

+/* Maximum number of swap pages in flight */
+int max_async_pages;
+
+/* We track the number of pages currently being asynchronously swapped
+ out, so that we don't try to swap TOO many pages out at once */
+atomic_t nr_async_pages = ATOMIC_INIT(0);
+
/*
* This variable contains the amount of page steals the system
* is doing, averaged over a minute. We use this to determine how
@@ -53,28 +58,6 @@
*/
int memory_pressure;

-/* We track the number of pages currently being asynchronously swapped
- out, so that we don't try to swap TOO many pages out at once */
-atomic_t nr_async_pages = ATOMIC_INIT(0);
-
-buffer_mem_t buffer_mem = {
- 2, /* minimum percent buffer */
- 10, /* borrow percent buffer */
- 60 /* maximum percent buffer */
-};
-
-buffer_mem_t page_cache = {
- 2, /* minimum percent page cache */
- 15, /* borrow percent page cache */
- 75 /* maximum */
-};
-
-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 */
-};
-
/**
* age_page_{up,down} - page aging helper functions
* @page - the page we want to age
@@ -302,4 +285,6 @@
page_cluster = 3;
else
page_cluster = 4;
+
+ max_async_pages = 1 << (page_cluster + 3);
}
Index: 0.2/mm/memory.c
--- 0.2/mm/memory.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/18_memory.c 1.1 644)
+++ 0.10/mm/memory.c Tue, 09 Jan 2001 01:31:18 +0100 zcalusic (linux24/j/18_memory.c 1.4 644)
@@ -40,7 +40,6 @@
#include <linux/mman.h>
#include <linux/swap.h>
#include <linux/smp_lock.h>
-#include <linux/swapctl.h>
#include <linux/iobuf.h>
#include <asm/uaccess.h>
#include <asm/pgalloc.h>
@@ -1000,8 +999,7 @@
num = valid_swaphandles(entry, &offset);
for (i = 0; i < num; offset++, i++) {
/* Don't block on I/O for read-ahead */
- if (atomic_read(&nr_async_pages) >= pager_daemon.swap_cluster
- * (1 << page_cluster)) {
+ if (atomic_read(&nr_async_pages) >= max_async_pages) {
while (i++ < num)
swap_free(SWP_ENTRY(SWP_TYPE(entry), offset++));
break;
Index: 0.2/kernel/sysctl.c
--- 0.2/kernel/sysctl.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/38_sysctl.c 1.1 644)
+++ 0.10/kernel/sysctl.c Tue, 09 Jan 2001 01:31:18 +0100 zcalusic (linux24/j/38_sysctl.c 1.1.1.4 644)
@@ -20,8 +20,8 @@

#include <linux/config.h>
#include <linux/malloc.h>
+#include <linux/swap.h>
#include <linux/sysctl.h>
-#include <linux/swapctl.h>
#include <linux/proc_fs.h>
#include <linux/ctype.h>
#include <linux/utsname.h>
@@ -241,22 +241,18 @@

static ctl_table vm_table[] = {
{VM_FREEPG, "freepages",
- &freepages, sizeof(freepages_t), 0444, NULL, &proc_dointvec},
+ &freepages, 3*sizeof(int), 0444, NULL, &proc_dointvec},
{VM_BDFLUSH, "bdflush", &bdf_prm, 9*sizeof(int), 0644, NULL,
&proc_dointvec_minmax, &sysctl_intvec, NULL,
&bdflush_min, &bdflush_max},
{VM_OVERCOMMIT_MEMORY, "overcommit_memory", &sysctl_overcommit_memory,
sizeof(sysctl_overcommit_memory), 0644, NULL, &proc_dointvec},
- {VM_BUFFERMEM, "buffermem",
- &buffer_mem, sizeof(buffer_mem_t), 0644, NULL, &proc_dointvec},
- {VM_PAGECACHE, "pagecache",
- &page_cache, sizeof(buffer_mem_t), 0644, NULL, &proc_dointvec},
- {VM_PAGERDAEMON, "kswapd",
- &pager_daemon, sizeof(pager_daemon_t), 0644, NULL, &proc_dointvec},
{VM_PGT_CACHE, "pagetable_cache",
&pgt_cache_water, 2*sizeof(int), 0644, NULL, &proc_dointvec},
{VM_PAGE_CLUSTER, "page-cluster",
&page_cluster, sizeof(int), 0644, NULL, &proc_dointvec},
+ {VM_MAX_ASYNC_PAGES, "max-async-pages",
+ &max_async_pages, sizeof(int), 0644, NULL, &proc_dointvec},
{0}
};

Index: 0.2/include/linux/swap.h
--- 0.2/include/linux/swap.h Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/d/b/26_swap.h 1.1 644)
+++ 0.10/include/linux/swap.h Tue, 09 Jan 2001 01:33:49 +0100 zcalusic (linux24/d/b/26_swap.h 1.4 644)
@@ -41,8 +41,6 @@
#define SWP_USED 1
#define SWP_WRITEOK 3

-#define SWAP_CLUSTER_MAX 32
-
#define SWAP_MAP_MAX 0x7fff
#define SWAP_MAP_BAD 0x8000

@@ -63,6 +61,15 @@
int next; /* next entry on swap list */
};

+typedef struct freepages_v1
+{
+ unsigned int min;
+ unsigned int low;
+ unsigned int high;
+} freepages_v1;
+typedef freepages_v1 freepages_t;
+extern freepages_t freepages;
+
extern int nr_swap_pages;
FASTCALL(unsigned int nr_free_pages(void));
FASTCALL(unsigned int nr_inactive_clean_pages(void));
@@ -70,6 +77,7 @@
extern int nr_active_pages;
extern int nr_inactive_dirty_pages;
extern atomic_t nr_async_pages;
+extern int max_async_pages;
extern struct address_space swapper_space;
extern atomic_t page_cache_size;
extern atomic_t buffermem_pages;
@@ -80,7 +88,6 @@
struct task_struct;
struct vm_area_struct;
struct sysinfo;
-
struct zone_t;

/* linux/mm/swap.c */
Index: 0.2/include/linux/sysctl.h
--- 0.2/include/linux/sysctl.h Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/e/b/38_sysctl.h 1.1 644)
+++ 0.10/include/linux/sysctl.h Tue, 09 Jan 2001 01:31:18 +0100 zcalusic (linux24/e/b/38_sysctl.h 1.1.1.3 644)
@@ -128,11 +128,12 @@
VM_FREEPG=3, /* struct: Set free page thresholds */
VM_BDFLUSH=4, /* struct: Control buffer cache flushing */
VM_OVERCOMMIT_MEMORY=5, /* Turn off the virtual memory safety limit */
- VM_BUFFERMEM=6, /* struct: Set buffer memory thresholds */
- VM_PAGECACHE=7, /* struct: Set cache memory thresholds */
- VM_PAGERDAEMON=8, /* struct: Control kswapd behaviour */
+/* was VM_BUFFERMEM */
+/* was VM_PAGECACHE */
+/* was VM_PAGERDAEMON */
VM_PGT_CACHE=9, /* struct: Set page table cache parameters */
- VM_PAGE_CLUSTER=10 /* int: set number of pages to swap together */
+ VM_PAGE_CLUSTER=10, /* int: set number of pages to swap together */
+ VM_MAX_ASYNC_PAGES=11 /* int: max number of swap pages in flight */
};


Index: 0.2/include/linux/mm.h
--- 0.2/include/linux/mm.h Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/g/b/6_mm.h 1.1 644)
+++ 0.10/include/linux/mm.h Sun, 07 Jan 2001 18:42:20 +0100 zcalusic (linux24/g/b/6_mm.h 1.2 644)
@@ -521,11 +521,6 @@

extern struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr);

-#define buffer_under_min() (atomic_read(&buffermem_pages) * 100 < \
- buffer_mem.min_percent * num_physpages)
-#define pgcache_under_min() (atomic_read(&page_cache_size) * 100 < \
- page_cache.min_percent * num_physpages)
-
#endif /* __KERNEL__ */

#endif
Index: 0.2/fs/coda/sysctl.c
--- 0.2/fs/coda/sysctl.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/j/b/38_sysctl.c 1.1 644)
+++ 0.10/fs/coda/sysctl.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/b/38_sysctl.c 1.2 644)
@@ -15,7 +15,6 @@
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/sysctl.h>
-#include <linux/swapctl.h>
#include <linux/proc_fs.h>
#include <linux/malloc.h>
#include <linux/stat.h>
Index: 0.2/fs/buffer.c
--- 0.2/fs/buffer.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/p/b/15_buffer.c 1.1 644)
+++ 0.10/fs/buffer.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/p/b/15_buffer.c 1.2 644)
@@ -35,7 +35,6 @@
#include <linux/locks.h>
#include <linux/errno.h>
#include <linux/swap.h>
-#include <linux/swapctl.h>
#include <linux/smp_lock.h>
#include <linux/vmalloc.h>
#include <linux/blkdev.h>
Index: 0.2/arch/mips64/mm/init.c
--- 0.2/arch/mips64/mm/init.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/o/c/30_init.c 1.1 644)
+++ 0.10/arch/mips64/mm/init.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/o/c/30_init.c 1.2 644)
@@ -22,7 +22,6 @@
#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
Index: 0.2/arch/arm/mm/init.c
--- 0.2/arch/arm/mm/init.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/v/c/33_init.c 1.1 644)
+++ 0.10/arch/arm/mm/init.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/v/c/33_init.c 1.2 644)
@@ -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>
Index: 0.2/arch/sparc64/mm/init.c
--- 0.2/arch/sparc64/mm/init.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/y/c/18_init.c 1.1 644)
+++ 0.10/arch/sparc64/mm/init.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/y/c/18_init.c 1.2 644)
@@ -15,7 +15,6 @@
#include <linux/malloc.h>
#include <linux/blk.h>
#include <linux/swap.h>
-#include <linux/swapctl.h>

#include <asm/head.h>
#include <asm/system.h>
Index: 0.2/arch/mips/mm/init.c
--- 0.2/arch/mips/mm/init.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/M/c/40_init.c 1.1 644)
+++ 0.10/arch/mips/mm/init.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/M/c/40_init.c 1.2 644)
@@ -22,7 +22,6 @@
#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
Index: 0.2/arch/sparc/mm/init.c
--- 0.2/arch/sparc/mm/init.c Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/N/c/32_init.c 1.1 644)
+++ 0.10/arch/sparc/mm/init.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/N/c/32_init.c 1.2 644)
@@ -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
Index: 0.2/Documentation/sysctl/vm.txt
--- 0.2/Documentation/sysctl/vm.txt Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/X/c/33_vm.txt 1.1 644)
+++ 0.10/Documentation/sysctl/vm.txt Tue, 09 Jan 2001 01:46:36 +0100 zcalusic (linux24/X/c/33_vm.txt 1.2 644)
@@ -6,7 +6,7 @@
==============================================================

This file contains the documentation for the sysctl files in
-/proc/sys/vm and is valid for Linux kernel version 2.2.
+/proc/sys/vm and is valid for Linux kernel version 2.4.

The files in this directory can be used to tune the operation
of the virtual memory (VM) subsystem of the Linux kernel, and
@@ -18,12 +18,10 @@

Currently, these files are in /proc/sys/vm:
- bdflush
-- buffermem
- freepages
-- kswapd
+- max-async-pages
- overcommit_memory
- page-cluster
-- pagecache
- pagetable_cache

==============================================================
@@ -93,20 +91,7 @@
age_super is for filesystem metadata.

==============================================================
-buffermem:

-The three values in this file correspond to the values in
-the struct buffer_mem. It controls how much memory should
-be used for buffer memory. The percentage is calculated
-as a percentage of total system memory.
-
-The values are:
-min_percent -- this is the minimum percentage of memory
- that should be spent on buffer memory
-borrow_percent -- UNUSED
-max_percent -- UNUSED
-
-==============================================================
freepages:

This file contains the values in the struct freepages. That
@@ -126,36 +111,12 @@

==============================================================

-kswapd:
+max-async-pages:

-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.
+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.

==============================================================

Index: 0.10/include/linux/swapctl.h
--- 0.2/include/linux/swapctl.h Sat, 06 Jan 2001 01:48:21 +0100 zcalusic (linux24/c/b/36_swapctl.h 1.1 644)
+++ 0.10/include/linux/swapctl.h Tue, 09 Jan 2001 01:46:49 +0100 zcalusic ()
@@ -1,35 +0,0 @@
-#ifndef _LINUX_SWAPCTL_H
-#define _LINUX_SWAPCTL_H
-
-#include <asm/page.h>
-#include <linux/fs.h>
-
-typedef struct buffer_mem_v1
-{
- unsigned int min_percent;
- unsigned int borrow_percent;
- unsigned int max_percent;
-} buffer_mem_v1;
-typedef buffer_mem_v1 buffer_mem_t;
-extern buffer_mem_t buffer_mem;
-extern buffer_mem_t page_cache;
-
-typedef struct freepages_v1
-{
- unsigned int min;
- unsigned int low;
- unsigned int high;
-} freepages_v1;
-typedef freepages_v1 freepages_t;
-extern freepages_t freepages;
-
-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 */
--
Zlatko
-
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