Beside that it also fixes what I think is a bug:
if ((rw == WRITE) && atomic_read(&nr_async_pages) >
pager_daemon.swap_cluster * (1 << page_cluster))
In that (swapout logic) it effectively says swap out 512KB at once (at
least on my memory configuration). I think that is a little too much.
I modified it to be a little bit more conservative and send only
(1 << page_cluster) to the swap at a time. Same applies to the
swapin_readahead() function. Comments welcome.
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)
+++ 0.6/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)
+++ 0.6/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)
+++ 0.6/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)
+++ 0.6/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)
+++ 0.6/mm/vmscan.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/9_vmscan.c 1.2 644)
@@ -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)
+++ 0.6/mm/page_io.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/10_page_io.c 1.3 644)
@@ -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>
@@ -44,7 +43,7 @@
/* Don't allow too many pending pages in flight.. */
if ((rw == WRITE) && atomic_read(&nr_async_pages) >
- pager_daemon.swap_cluster * (1 << page_cluster))
+ (1 << page_cluster))
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)
+++ 0.6/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)
+++ 0.6/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)
+++ 0.6/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)
+++ 0.6/mm/swap.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/17_swap.c 1.4 644)
@@ -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 +40,10 @@
/* How many pages do we try to swap or page in/out together? */
int page_cluster;
+/* 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
@@ -52,28 +54,6 @@
* In recalculate_vm_stats the value is decayed (once a second)
*/
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
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)
+++ 0.6/mm/memory.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/18_memory.c 1.3 644)
@@ -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) >= (1 << page_cluster)) {
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)
+++ 0.6/kernel/sysctl.c Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/j/38_sysctl.c 1.1.1.3 644)
@@ -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>
@@ -241,18 +241,12 @@
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",
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)
+++ 0.6/include/linux/swap.h Sun, 07 Jan 2001 20:17:13 +0100 zcalusic (linux24/d/b/26_swap.h 1.2 644)
@@ -63,6 +63,15 @@
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));
@@ -80,7 +89,6 @@
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)
+++ 0.6/include/linux/sysctl.h Sun, 07 Jan 2001 19:16:44 +0100 zcalusic (linux24/e/b/38_sysctl.h 1.1.1.2 644)
@@ -128,9 +128,9 @@
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 */
};
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)
+++ 0.6/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)
+++ 0.6/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)
+++ 0.6/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)
+++ 0.6/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)
+++ 0.6/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)
+++ 0.6/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)
+++ 0.6/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)
+++ 0.6/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: 0.6/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)
+++ 0.6/include/linux/swapctl.h Sun, 07 Jan 2001 21:30:32 +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 */
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