From 8cdcc532268df0893d9756f537cbce479f4c4831 Mon Sep 17 00:00:00 2001 From: SeongJae Park Date: Mon, 13 Jun 2022 19:22:56 +0000 Subject: mm/damon/schemes: add 'LRU_PRIO' DAMOS action This commit adds a new DAMOS action called 'LRU_PRIO' for the physical address space. The action prioritizes pages in the memory regions of the user-specified target access pattern on their LRU lists. This is hence supposed to be used for frequently accessed (hot) memory regions so that hot pages could be more likely protected under memory pressure. Internally, it simply calls 'mark_page_accessed()'. Link: https://lkml.kernel.org/r/20220613192301.8817-5-sj@kernel.org Signed-off-by: SeongJae Park Cc: Jonathan Corbet Signed-off-by: Andrew Morton --- mm/damon/paddr.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'mm/damon/paddr.c') diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c index 7bcd48066b43..f145b1d51e13 100644 --- a/mm/damon/paddr.c +++ b/mm/damon/paddr.c @@ -233,6 +233,22 @@ static unsigned long damon_pa_pageout(struct damon_region *r) return applied * PAGE_SIZE; } +static unsigned long damon_pa_mark_accessed(struct damon_region *r) +{ + unsigned long addr, applied = 0; + + for (addr = r->ar.start; addr < r->ar.end; addr += PAGE_SIZE) { + struct page *page = damon_get_page(PHYS_PFN(addr)); + + if (!page) + continue; + mark_page_accessed(page); + put_page(page); + applied++; + } + return applied * PAGE_SIZE; +} + static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx, struct damon_target *t, struct damon_region *r, struct damos *scheme) @@ -240,6 +256,8 @@ static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx, switch (scheme->action) { case DAMOS_PAGEOUT: return damon_pa_pageout(r); + case DAMOS_LRU_PRIO: + return damon_pa_mark_accessed(r); default: break; } @@ -253,6 +271,8 @@ static int damon_pa_scheme_score(struct damon_ctx *context, switch (scheme->action) { case DAMOS_PAGEOUT: return damon_pageout_score(context, r, scheme); + case DAMOS_LRU_PRIO: + return damon_hot_score(context, r, scheme); default: break; } -- cgit v1.2.3