diff options
| -rw-r--r-- | mm/damon/lru_sort.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c index a74c4ec170a9..f1fdb37b9b47 100644 --- a/mm/damon/lru_sort.c +++ b/mm/damon/lru_sort.c @@ -42,6 +42,21 @@ static bool commit_inputs __read_mostly; module_param(commit_inputs, bool, 0600); /* + * Filter [non-]young pages accordingly for LRU [de]prioritizations. + * + * If this is set, check page level access (youngness) once again before each + * LRU [de]prioritization operation. LRU prioritization operation is skipped + * if the page has not accessed since the last check (not young). LRU + * deprioritization operation is skipped if the page has accessed since the + * last check (young). The feature is enabled or disabled if this parameter is + * set as ``Y`` or ``N``, respectively. + * + * Disabled by default. + */ +static bool filter_young_pages __read_mostly; +module_param(filter_young_pages, bool, 0600); + +/* * Access frequency threshold for hot memory regions identification in permil. * * If a memory region is accessed in frequency of this or higher, @@ -193,6 +208,28 @@ static struct damos *damon_lru_sort_new_cold_scheme(unsigned int cold_thres) return damon_lru_sort_new_scheme(&pattern, DAMOS_LRU_DEPRIO); } +static int damon_lru_sort_add_filters(struct damos *hot_scheme, + struct damos *cold_scheme) +{ + struct damos_filter *filter; + + if (!filter_young_pages) + return 0; + + /* disallow prioritizing not-young pages */ + filter = damos_new_filter(DAMOS_FILTER_TYPE_YOUNG, false, false); + if (!filter) + return -ENOMEM; + damos_add_filter(hot_scheme, filter); + + /* disabllow de-prioritizing young pages */ + filter = damos_new_filter(DAMOS_FILTER_TYPE_YOUNG, true, false); + if (!filter) + return -ENOMEM; + damos_add_filter(cold_scheme, filter); + return 0; +} + static int damon_lru_sort_apply_parameters(void) { struct damon_ctx *param_ctx; @@ -240,6 +277,10 @@ static int damon_lru_sort_apply_parameters(void) damon_set_schemes(param_ctx, &hot_scheme, 1); damon_add_scheme(param_ctx, cold_scheme); + err = damon_lru_sort_add_filters(hot_scheme, cold_scheme); + if (err) + goto out; + err = damon_set_region_biggest_system_ram_default(param_target, &monitor_region_start, &monitor_region_end, |