diff options
| author | SeongJae Park <sj@kernel.org> | 2022-06-13 19:22:56 +0000 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-07-03 18:08:42 -0700 |
| commit | 8cdcc532268df0893d9756f537cbce479f4c4831 (patch) | |
| tree | 2077cacb9fcb45632ce47c34000e80cab4f3051e /mm/damon/paddr.c | |
| parent | 0e93e8bfd0b8b953038785109d0bab72280823f6 (diff) | |
| download | linux-8cdcc532268df0893d9756f537cbce479f4c4831.tar.bz2 | |
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 <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/damon/paddr.c')
| -rw-r--r-- | mm/damon/paddr.c | 20 |
1 files changed, 20 insertions, 0 deletions
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; } |