[RFC v15 3/8] mm/damon/primitives: Support DAMON-based Operation Schemes

[SeongJae Park <sjpark@amazon.com>]

From: SeongJae Park <sjpark@amazon.de>

This commit makes DAMON's default primitives for virtual address spaces
to support DAMON-based Operation Schemes (DAMOS) by implementing actions
application functions and registering it to the monitoring context.  The
implementation simply links 'madvise()' for related DAMOS actions.  That
is, 'madvise(MADV_WILLNEED)' is called for 'WILLNEED' DAMOS action and
similar for other actions ('COLD', 'PAGEOUT', 'HUGEPAGE', 'NOHUGEPAGE').

So, the kernel space DAMON users can now use the DAMON-based
optimizations with only small amount of code.

Signed-off-by: SeongJae Park <sjpark@amazon.de>
---
 include/linux/damon.h |  2 ++
 mm/damon/primitives.c | 62 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index 92944a336286..3aaea4fdde80 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -323,6 +323,8 @@ void damon_va_prepare_access_checks(struct damon_ctx *ctx);
 unsigned int damon_va_check_accesses(struct damon_ctx *ctx);
 bool damon_va_target_valid(struct damon_target *t);
 void damon_va_cleanup(struct damon_ctx *ctx);
+int damon_va_apply_scheme(struct damon_ctx *context, struct damon_target *t,
+		struct damon_region *r, struct damos *scheme);
 void damon_va_set_primitives(struct damon_ctx *ctx);
 
 #endif	/* CONFIG_DAMON_PRIMITIVES */
diff --git a/mm/damon/primitives.c b/mm/damon/primitives.c
index abc072008faf..2224e3e139a8 100644
--- a/mm/damon/primitives.c
+++ b/mm/damon/primitives.c
@@ -7,6 +7,7 @@
 
 #define pr_fmt(fmt) "damon-prmt: " fmt
 
+#include <asm-generic/mman-common.h>
 #include <linux/damon.h>
 #include <linux/mm.h>
 #include <linux/mmu_notifier.h>
@@ -582,6 +583,66 @@ void damon_va_cleanup(struct damon_ctx *ctx)
 	}
 }
 
+#ifndef CONFIG_ADVISE_SYSCALLS
+static int damos_madvise(struct damon_target *target, struct damon_region *r,
+			int behavior)
+{
+	return -EINVAL;
+}
+#else
+static int damos_madvise(struct damon_target *target, struct damon_region *r,
+			int behavior)
+{
+	struct task_struct *t;
+	struct mm_struct *mm;
+	int ret = -ENOMEM;
+
+	t = damon_get_task_struct(target);
+	if (!t)
+		goto out;
+	mm = damon_get_mm(target);
+	if (!mm)
+		goto put_task_out;
+
+	ret = do_madvise(t, mm, PAGE_ALIGN(r->ar.start),
+			PAGE_ALIGN(r->ar.end - r->ar.start), behavior);
+	mmput(mm);
+put_task_out:
+	put_task_struct(t);
+out:
+	return ret;
+}
+#endif	/* CONFIG_ADVISE_SYSCALLS */
+
+int damon_va_apply_scheme(struct damon_ctx *ctx, struct damon_target *t,
+		struct damon_region *r, struct damos *scheme)
+{
+	int madv_action;
+
+	switch (scheme->action) {
+	case DAMOS_WILLNEED:
+		madv_action = MADV_WILLNEED;
+		break;
+	case DAMOS_COLD:
+		madv_action = MADV_COLD;
+		break;
+	case DAMOS_PAGEOUT:
+		madv_action = MADV_PAGEOUT;
+		break;
+	case DAMOS_HUGEPAGE:
+		madv_action = MADV_HUGEPAGE;
+		break;
+	case DAMOS_NOHUGEPAGE:
+		madv_action = MADV_NOHUGEPAGE;
+		break;
+	default:
+		pr_warn("Wrong action %d\n", scheme->action);
+		return -EINVAL;
+	}
+
+	return damos_madvise(t, r, madv_action);
+}
+
 void damon_va_set_primitives(struct damon_ctx *ctx)
 {
 	ctx->primitive.init_target_regions = damon_va_init_regions;
@@ -590,6 +651,7 @@ void damon_va_set_primitives(struct damon_ctx *ctx)
 	ctx->primitive.check_accesses = damon_va_check_accesses;
 	ctx->primitive.target_valid = damon_va_target_valid;
 	ctx->primitive.cleanup = damon_va_cleanup;
+	ctx->primitive.apply_scheme = damon_va_apply_scheme;
 }
 
 #include "primitives-test.h"
-- 
2.17.1