diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page_alloc.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 941b802e11ec..d156310aedeb 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -249,6 +249,7 @@ compound_page_dtor * const compound_page_dtors[] = { int min_free_kbytes = 1024; int user_min_free_kbytes = -1; +int watermark_scale_factor = 10; static unsigned long __meminitdata nr_kernel_pages; static unsigned long __meminitdata nr_all_pages; @@ -6347,8 +6348,17 @@ static void __setup_per_zone_wmarks(void) zone->watermark[WMARK_MIN] = tmp; } - zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + (tmp >> 2); - zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + (tmp >> 1); + /* + * Set the kswapd watermarks distance according to the + * scale factor in proportion to available memory, but + * ensure a minimum size on small systems. + */ + tmp = max_t(u64, tmp >> 2, + mult_frac(zone->managed_pages, + watermark_scale_factor, 10000)); + + zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + tmp; + zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + tmp * 2; __mod_zone_page_state(zone, NR_ALLOC_BATCH, high_wmark_pages(zone) - low_wmark_pages(zone) - @@ -6489,6 +6499,21 @@ int min_free_kbytes_sysctl_handler(struct ctl_table *table, int write, return 0; } +int watermark_scale_factor_sysctl_handler(struct ctl_table *table, int write, + void __user *buffer, size_t *length, loff_t *ppos) +{ + int rc; + + rc = proc_dointvec_minmax(table, write, buffer, length, ppos); + if (rc) + return rc; + + if (write) + setup_per_zone_wmarks(); + + return 0; +} + #ifdef CONFIG_NUMA int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos) |