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    Contents of /trunk/kernel26-magellan/patches-2.6.21-r13/0015-2.6.21-mm-prio_dependant_scan-2.patch

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    Revision 319 - (show annotations) (download)
    Sun Aug 19 18:14:21 2007 UTC (17 years, 2 months ago) by niro
    File size: 6529 byte(s) 
    -2.6.21-magellan-r13
    1 Set the initial "priority" of memory reclaim scanning according to the cpu
    2 scheduling priority thus determining how aggressively reclaim is to initally
    3 progress according to nice level.
    4
    5 Signed-off-by: Con Kolivas <kernel@kolivas.org>
    6
    7 fs/buffer.c | 2 +-
    8 include/linux/swap.h | 3 ++-
    9 mm/page_alloc.c | 2 +-
    10 mm/vmscan.c | 37 ++++++++++++++++++++++++-------------
    11 4 files changed, 28 insertions(+), 16 deletions(-)
    12
    13 Index: linux-2.6.21-ck2/fs/buffer.c
    14 ===================================================================
    15 --- linux-2.6.21-ck2.orig/fs/buffer.c 2007-05-14 19:49:18.000000000 +1000
    16 +++ linux-2.6.21-ck2/fs/buffer.c 2007-05-14 19:49:56.000000000 +1000
    17 @@ -363,7 +363,7 @@ static void free_more_memory(void)
    18 for_each_online_pgdat(pgdat) {
    19 zones = pgdat->node_zonelists[gfp_zone(GFP_NOFS)].zones;
    20 if (*zones)
    21 - try_to_free_pages(zones, GFP_NOFS);
    22 + try_to_free_pages(zones, GFP_NOFS, NULL);
    23 }
    24 }
    25
    26 Index: linux-2.6.21-ck2/include/linux/swap.h
    27 ===================================================================
    28 --- linux-2.6.21-ck2.orig/include/linux/swap.h 2007-05-14 19:49:55.000000000 +1000
    29 +++ linux-2.6.21-ck2/include/linux/swap.h 2007-05-14 19:49:56.000000000 +1000
    30 @@ -189,7 +189,8 @@ extern int rotate_reclaimable_page(struc
    31 extern void swap_setup(void);
    32
    33 /* linux/mm/vmscan.c */
    34 -extern unsigned long try_to_free_pages(struct zone **, gfp_t);
    35 +extern unsigned long try_to_free_pages(struct zone **, gfp_t,
    36 + struct task_struct *p);
    37 extern unsigned long shrink_all_memory(unsigned long nr_pages);
    38 extern int vm_mapped;
    39 extern int vm_hardmaplimit;
    40 Index: linux-2.6.21-ck2/mm/page_alloc.c
    41 ===================================================================
    42 --- linux-2.6.21-ck2.orig/mm/page_alloc.c 2007-05-14 19:49:55.000000000 +1000
    43 +++ linux-2.6.21-ck2/mm/page_alloc.c 2007-05-14 19:49:56.000000000 +1000
    44 @@ -1341,7 +1341,7 @@ nofail_alloc:
    45 reclaim_state.reclaimed_slab = 0;
    46 p->reclaim_state = &reclaim_state;
    47
    48 - did_some_progress = try_to_free_pages(zonelist->zones, gfp_mask);
    49 + did_some_progress = try_to_free_pages(zonelist->zones, gfp_mask, p);
    50
    51 p->reclaim_state = NULL;
    52 p->flags &= ~PF_MEMALLOC;
    53 Index: linux-2.6.21-ck2/mm/vmscan.c
    54 ===================================================================
    55 --- linux-2.6.21-ck2.orig/mm/vmscan.c 2007-05-14 19:49:55.000000000 +1000
    56 +++ linux-2.6.21-ck2/mm/vmscan.c 2007-05-14 19:49:56.000000000 +1000
    57 @@ -993,6 +993,11 @@ static void set_kswapd_nice(struct task_
    58 set_user_nice(kswapd, nice);
    59 }
    60
    61 +static int sc_priority(struct task_struct *p)
    62 +{
    63 + return (DEF_PRIORITY + (DEF_PRIORITY * effective_sc_prio(p) / 40));
    64 +}
    65 +
    66 /*
    67 * This is the direct reclaim path, for page-allocating processes. We only
    68 * try to reclaim pages from zones which will satisfy the caller's allocation
    69 @@ -1050,7 +1055,8 @@ static unsigned long shrink_zones(int pr
    70 * holds filesystem locks which prevent writeout this might not work, and the
    71 * allocation attempt will fail.
    72 */
    73 -unsigned long try_to_free_pages(struct zone **zones, gfp_t gfp_mask)
    74 +unsigned long try_to_free_pages(struct zone **zones, gfp_t gfp_mask,
    75 + struct task_struct *p)
    76 {
    77 int priority;
    78 int ret = 0;
    79 @@ -1058,7 +1064,7 @@ unsigned long try_to_free_pages(struct z
    80 unsigned long nr_reclaimed = 0;
    81 struct reclaim_state *reclaim_state = current->reclaim_state;
    82 unsigned long lru_pages = 0;
    83 - int i;
    84 + int i, scan_priority = DEF_PRIORITY;
    85 struct scan_control sc = {
    86 .gfp_mask = gfp_mask,
    87 .may_writepage = !laptop_mode,
    88 @@ -1067,6 +1073,9 @@ unsigned long try_to_free_pages(struct z
    89 .mapped = vm_mapped,
    90 };
    91
    92 + if (p)
    93 + scan_priority = sc_priority(p);
    94 +
    95 delay_swap_prefetch();
    96
    97 count_vm_event(ALLOCSTALL);
    98 @@ -1081,7 +1090,7 @@ unsigned long try_to_free_pages(struct z
    99 + zone_page_state(zone, NR_INACTIVE);
    100 }
    101
    102 - for (priority = DEF_PRIORITY; priority >= 0; priority--) {
    103 + for (priority = scan_priority; priority >= 0; priority--) {
    104 sc.nr_scanned = 0;
    105 if (!priority)
    106 disable_swap_token();
    107 @@ -1111,7 +1120,7 @@ unsigned long try_to_free_pages(struct z
    108 }
    109
    110 /* Take a nap, wait for some writeback to complete */
    111 - if (sc.nr_scanned && priority < DEF_PRIORITY - 2)
    112 + if (sc.nr_scanned && priority < scan_priority - 2)
    113 congestion_wait(WRITE, HZ/10);
    114 }
    115 /* top priority shrink_caches still had more to do? don't OOM, then */
    116 @@ -1161,9 +1170,9 @@ out:
    117 */
    118 static unsigned long balance_pgdat(pg_data_t *pgdat, int order)
    119 {
    120 - int all_zones_ok;
    121 + int all_zones_ok = 0;
    122 int priority;
    123 - int i;
    124 + int i, scan_priority;
    125 unsigned long total_scanned;
    126 unsigned long nr_reclaimed;
    127 struct reclaim_state *reclaim_state = current->reclaim_state;
    128 @@ -1179,6 +1188,8 @@ static unsigned long balance_pgdat(pg_da
    129 */
    130 int temp_priority[MAX_NR_ZONES];
    131
    132 + scan_priority = sc_priority(pgdat->kswapd);
    133 +
    134 loop_again:
    135 total_scanned = 0;
    136 nr_reclaimed = 0;
    137 @@ -1186,9 +1197,9 @@ loop_again:
    138 count_vm_event(PAGEOUTRUN);
    139
    140 for (i = 0; i < pgdat->nr_zones; i++)
    141 - temp_priority[i] = DEF_PRIORITY;
    142 + temp_priority[i] = scan_priority;
    143
    144 - for (priority = DEF_PRIORITY; priority >= 0; priority--) {
    145 + for (priority = scan_priority; priority >= 0; priority--) {
    146 int end_zone = 0; /* Inclusive. 0 = ZONE_DMA */
    147 unsigned long lru_pages = 0;
    148
    149 @@ -1209,7 +1220,7 @@ loop_again:
    150 if (!populated_zone(zone))
    151 continue;
    152
    153 - if (zone->all_unreclaimable && priority != DEF_PRIORITY)
    154 + if (zone->all_unreclaimable && priority != scan_priority)
    155 continue;
    156
    157 /*
    158 @@ -1218,7 +1229,7 @@ loop_again:
    159 * pages_high.
    160 */
    161 watermark = zone->pages_high + (zone->pages_high *
    162 - priority / DEF_PRIORITY);
    163 + priority / scan_priority);
    164 if (!zone_watermark_ok(zone, order, watermark, 0, 0)) {
    165 end_zone = i;
    166 break;
    167 @@ -1251,11 +1262,11 @@ loop_again:
    168 if (!populated_zone(zone))
    169 continue;
    170
    171 - if (zone->all_unreclaimable && priority != DEF_PRIORITY)
    172 + if (zone->all_unreclaimable && priority != scan_priority)
    173 continue;
    174
    175 watermark = zone->pages_high + (zone->pages_high *
    176 - priority / DEF_PRIORITY);
    177 + priority / scan_priority);
    178
    179 if (!zone_watermark_ok(zone, order, watermark,
    180 end_zone, 0))
    181 @@ -1290,7 +1301,7 @@ loop_again:
    182 * OK, kswapd is getting into trouble. Take a nap, then take
    183 * another pass across the zones.
    184 */
    185 - if (total_scanned && priority < DEF_PRIORITY - 2)
    186 + if (total_scanned && priority < scan_priority - 2)
    187 congestion_wait(WRITE, HZ/10);
    188
    189 /*