Annotation of /trunk/kernel26-magellan/patches-2.6.16-r5/0027-2.6.16-mm-aggresive_swap_prefetch.patch
Parent Directory
| 
Revision Log
Revision 67 -
(hide annotations)
(download)
Wed Apr 12 18:59:30 2006 UTC (18 years, 1 month ago) by niro
File size: 3333 byte(s)
Wed Apr 12 18:59:30 2006 UTC (18 years, 1 month ago) by niro
File size: 3333 byte(s)
ver bump to 2.6.16-r5; updated to linux-2.6.16.4
| 1 | niro | 67 | --- |
| 2 | Documentation/sysctl/vm.txt | 14 ++++++++++---- | ||
| 3 | include/linux/swap-prefetch.h | 5 +++++ | ||
| 4 | mm/swap_prefetch.c | 11 +++++++++++ | ||
| 5 | 3 files changed, 26 insertions(+), 4 deletions(-) | ||
| 6 | |||
| 7 | Index: linux-2.6.16-ck1/include/linux/swap-prefetch.h | ||
| 8 | =================================================================== | ||
| 9 | --- linux-2.6.16-ck1.orig/include/linux/swap-prefetch.h 2006-03-20 20:46:55.000000000 +1100 | ||
| 10 | +++ linux-2.6.16-ck1/include/linux/swap-prefetch.h 2006-03-20 20:47:01.000000000 +1100 | ||
| 11 | @@ -33,6 +33,7 @@ extern void add_to_swapped_list(struct p | ||
| 12 | extern void remove_from_swapped_list(const unsigned long index); | ||
| 13 | extern void delay_swap_prefetch(void); | ||
| 14 | extern void prepare_swap_prefetch(void); | ||
| 15 | +extern void aggressive_swap_prefetch(void); | ||
| 16 | |||
| 17 | #else /* CONFIG_SWAP_PREFETCH */ | ||
| 18 | static inline void add_to_swapped_list(struct page *__unused) | ||
| 19 | @@ -50,6 +51,10 @@ static inline void remove_from_swapped_l | ||
| 20 | static inline void delay_swap_prefetch(void) | ||
| 21 | { | ||
| 22 | } | ||
| 23 | + | ||
| 24 | +static inline void aggressive_swap_prefetch(void) | ||
| 25 | +{ | ||
| 26 | +} | ||
| 27 | #endif /* CONFIG_SWAP_PREFETCH */ | ||
| 28 | |||
| 29 | #endif /* SWAP_PREFETCH_H_INCLUDED */ | ||
| 30 | Index: linux-2.6.16-ck1/mm/swap_prefetch.c | ||
| 31 | =================================================================== | ||
| 32 | --- linux-2.6.16-ck1.orig/mm/swap_prefetch.c 2006-03-20 20:47:00.000000000 +1100 | ||
| 33 | +++ linux-2.6.16-ck1/mm/swap_prefetch.c 2006-03-20 20:47:01.000000000 +1100 | ||
| 34 | @@ -29,6 +29,7 @@ | ||
| 35 | |||
| 36 | #define PREFETCH_NORMAL (1 << 0) | ||
| 37 | #define PREFETCH_AGGRESSIVE (1 << 1) | ||
| 38 | + | ||
| 39 | /* | ||
| 40 | * sysctl - enable/disable swap prefetching bits | ||
| 41 | * This is composed of the bitflags PREFETCH_NORMAL and PREFETCH_AGGRESSIVE. | ||
| 42 | @@ -601,6 +602,16 @@ void __init prepare_swap_prefetch(void) | ||
| 43 | } | ||
| 44 | } | ||
| 45 | |||
| 46 | +/* | ||
| 47 | + * This exported function sets the PREFETCH_AGGRESSIVE flag but only if there | ||
| 48 | + * are entries to prefetch. | ||
| 49 | + */ | ||
| 50 | +void aggressive_swap_prefetch(void) | ||
| 51 | +{ | ||
| 52 | + if (swapped.count) | ||
| 53 | + swap_prefetch |= PREFETCH_AGGRESSIVE; | ||
| 54 | +} | ||
| 55 | + | ||
| 56 | static int __init kprefetchd_init(void) | ||
| 57 | { | ||
| 58 | kprefetchd_task = kthread_run(kprefetchd, NULL, "kprefetchd"); | ||
| 59 | Index: linux-2.6.16-ck1/Documentation/sysctl/vm.txt | ||
| 60 | =================================================================== | ||
| 61 | --- linux-2.6.16-ck1.orig/Documentation/sysctl/vm.txt 2006-03-20 20:47:00.000000000 +1100 | ||
| 62 | +++ linux-2.6.16-ck1/Documentation/sysctl/vm.txt 2006-03-20 20:47:01.000000000 +1100 | ||
| 63 | @@ -192,9 +192,15 @@ This is value ORed together of | ||
| 64 | 1 = Normal background swap prefetching when load is light | ||
| 65 | 2 = Aggressively swap prefetch as much as possible | ||
| 66 | |||
| 67 | -When 2 is set, after the maximum amount possible has been prefetched, this bit | ||
| 68 | -is unset. ie Setting the value to 3 will prefetch aggressively then drop to 1. | ||
| 69 | -This is useful for doing aggressive prefetching for short periods in scripts | ||
| 70 | -such as after resuming from software suspend. | ||
| 71 | +ie Setting the value to 3 will prefetch aggressively then drop to 1. This | ||
| 72 | +is useful for doing aggressive prefetching for short periods in scripts | ||
| 73 | +such as after resuming from software suspend. Setting the value to 2 will | ||
| 74 | +prefetch aggressively as much as it can and then disable any further swap | ||
| 75 | +prefetching. | ||
| 76 | + | ||
| 77 | +Note that setting this to 0 disables even storing a list of swapped pages (to | ||
| 78 | +minimise overhead) which means that if significant swapping has occurred with | ||
| 79 | +swap_prefetch unset and then it is enabled, there is nothing that can be | ||
| 80 | +prefetched. | ||
| 81 | |||
| 82 | The default value is 1. |