mm-damon-schemes-add-lru_deprio-action.patch removed from -mm tree

merged mm-stable Andrew Morton 1 participant 1 message Jul 4, 2022

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Andrew Morton

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2022-07-04 01:10 UTC #0 lore raw

The quilt patch titled
Subject: mm/damon/schemes: add 'LRU_DEPRIO' action
has been removed from the -mm tree. Its filename was
mm-damon-schemes-add-lru_deprio-action.patch

This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: SeongJae Park <[email protected]>
Subject: mm/damon/schemes: add 'LRU_DEPRIO' action
Date: Mon, 13 Jun 2022 19:22:58 +0000

This commit adds a new DAMON-based operation scheme action called 'LRU_DEPRIO' for physical address space. The action deprioritizes pages in the memory area of the target access pattern on their LRU lists. This is hence supposed to be used for rarely accessed (cold) memory regions so that cold pages could be more likely reclaimed first under memory pressure. Internally, it simply calls 'lru_deactivate()'.

Using this with 'LRU_PRIO' action for hot pages, users can proactively sort LRU lists based on the access pattern. That is, it can make the LRU lists somewhat more trustworthy source of access temperature. As a result, efficiency of LRU-lists based mechanisms including the reclamation target selection could be improved.

Link https://lkml.kernel.org/r/[email protected] open here

Signed-off-by SeongJae Park <[email protected]>

Cc Jonathan Corbet <[email protected]>

Signed-off-by Andrew Morton <[email protected]>

---

 include/linux/damon.h |    2 ++
 mm/damon/paddr.c      |   20 ++++++++++++++++++++
 mm/damon/sysfs.c      |    1 +
 3 files changed, 23 insertions(+)

include/linux/damon.h renamed from include/linux/damon.h~mm-damon-schemes-add-lru_deprio-action +2 -0

@@ -87,6 +87,7 @@ struct damon_target {
  * @DAMOS_HUGEPAGE:	Call ``madvise()`` for the region with MADV_HUGEPAGE.
  * @DAMOS_NOHUGEPAGE:	Call ``madvise()`` for the region with MADV_NOHUGEPAGE.
  * @DAMOS_LRU_PRIO:	Prioritize the region on its LRU lists.
+ * @DAMOS_LRU_DEPRIO:	Deprioritize the region on its LRU lists.
  * @DAMOS_STAT:		Do nothing but count the stat.
  * @NR_DAMOS_ACTIONS:	Total number of DAMOS actions
  */

@@ -97,6 +98,7 @@ enum damos_action {
 	DAMOS_HUGEPAGE,
 	DAMOS_NOHUGEPAGE,
 	DAMOS_LRU_PRIO,
+	DAMOS_LRU_DEPRIO,
 	DAMOS_STAT,		/* Do nothing but only record the stat */
 	NR_DAMOS_ACTIONS,
 };

mm/damon/paddr.c renamed from mm/damon/paddr.c~mm-damon-schemes-add-lru_deprio-action +20 -0

@@ -249,6 +249,22 @@ static unsigned long damon_pa_mark_acces
 	return applied * PAGE_SIZE;
 }
 
+static unsigned long damon_pa_deactivate_pages(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;
+		deactivate_page(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)

@@ -258,6 +274,8 @@ static unsigned long damon_pa_apply_sche
 		return damon_pa_pageout(r);
 	case DAMOS_LRU_PRIO:
 		return damon_pa_mark_accessed(r);
+	case DAMOS_LRU_DEPRIO:
+		return damon_pa_deactivate_pages(r);
 	default:
 		break;
 	}

@@ -273,6 +291,8 @@ static int damon_pa_scheme_score(struct
 		return damon_pageout_score(context, r, scheme);
 	case DAMOS_LRU_PRIO:
 		return damon_hot_score(context, r, scheme);
+	case DAMOS_LRU_DEPRIO:
+		return damon_pageout_score(context, r, scheme);
 	default:
 		break;
 	}

mm/damon/sysfs.c renamed from mm/damon/sysfs.c~mm-damon-schemes-add-lru_deprio-action +1 -0

@@ -763,6 +763,7 @@ static const char * const damon_sysfs_da
 	"hugepage",
 	"nohugepage",
 	"lru_prio",
+	"lru_deprio",
 	"stat",
 };

Patches currently in -mm which might be from [email protected] are

docs-admin-guide-damon-sysfs-document-lru_deprio-scheme-action.patch mm-damon-introduce-damon-based-lru-lists-sorting.patch docs-admin-guide-damon-add-a-document-for-damon_lru_sort.patch