mm/damon/paddr: use a separate function for 'DAMOS_PAGEOUT' handling

This commit moves code for 'DAMOS_PAGEOUT' handling of the physical
address space monitoring operations set to a separate function so that its
caller, 'damon_pa_apply_scheme()', can be more easily extended for
additional DAMOS actions later.

Link: https://lkml.kernel.org/r/20220613192301.8817-4-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>

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index b40ff58..7bcd480 100644 (file)
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -204,16 +204,11 @@ static unsigned int damon_pa_check_accesses(struct damon_ctx *ctx)
        return max_nr_accesses;
 }
 
-static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
-               struct damon_target *t, struct damon_region *r,
-               struct damos *scheme)
+static unsigned long damon_pa_pageout(struct damon_region *r)
 {
        unsigned long addr, applied;
        LIST_HEAD(page_list);
 
-       if (scheme->action != DAMOS_PAGEOUT)
-               return 0;
-
        for (addr = r->ar.start; addr < r->ar.end; addr += PAGE_SIZE) {
                struct page *page = damon_get_page(PHYS_PFN(addr));
 
@@ -238,6 +233,19 @@ static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
        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)
+{
+       switch (scheme->action) {
+       case DAMOS_PAGEOUT:
+               return damon_pa_pageout(r);
+       default:
+               break;
+       }
+       return 0;
+}
+
 static int damon_pa_scheme_score(struct damon_ctx *context,
                struct damon_target *t, struct damon_region *r,
                struct damos *scheme)