The patch titled
Subject: mm/damon/core: avoid holes in newly set monitoring target ranges
has been added to the -mm mm-unstable branch. Its filename is
mm-damon-core-avoid-holes-in-newly-set-monitoring-target-ranges.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-core-avoid-holes-in-newly-set-monitoring-target-ranges.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: mm/damon/core: avoid holes in newly set monitoring target ranges
Date: Fri, 9 Sep 2022 20:28:56 +0000
When there are two or more non-contiguous regions intersecting with given
new ranges, 'damon_set_regions()' does not fill the holes. This commit
makes the function to fill the holes with newly created regions.
Link: https://lkml.kernel.org/r/20220909202901.57977-3-sj@xxxxxxxxxx
Fixes: 3f49584b262c ("mm/damon: implement primitives for the virtual memory address spaces")
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Reported-by: Yun Levi <ppbuk5246@xxxxxxxxx>
Cc: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/damon/core.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
--- a/mm/damon/core.c~mm-damon-core-avoid-holes-in-newly-set-monitoring-target-ranges
+++ a/mm/damon/core.c
@@ -169,6 +169,27 @@ static bool damon_intersect(struct damon
}
/*
+ * Fill holes in regions with new regions.
+ */
+static void damon_fill_regions_holes(struct damon_region *first,
+ struct damon_region *last, struct damon_target *t)
+{
+ struct damon_region *r = first;
+
+ damon_for_each_region_from(r, t) {
+ struct damon_region *next, *newr;
+
+ if (r == last)
+ break;
+ next = damon_next_region(r);
+ if (r->ar.end != next->ar.start) {
+ newr = damon_new_region(r->ar.end, next->ar.start);
+ damon_insert_region(newr, r, next, t);
+ }
+ }
+}
+
+/*
* damon_set_regions() - Set regions of a target for given address ranges.
* @t: the given target.
* @ranges: array of new monitoring target ranges.
@@ -226,6 +247,9 @@ int damon_set_regions(struct damon_targe
first->ar.start = ALIGN_DOWN(range->start,
DAMON_MIN_REGION);
last->ar.end = ALIGN(range->end, DAMON_MIN_REGION);
+
+ /* fill possible holes in the range */
+ damon_fill_regions_holes(first, last, t);
}
}
return 0;
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
mm-demotion-update-node_is_toptier-to-work-with-memory-tiers-fix.patch
selftest-damon-add-a-test-for-duplicate-context-dirs-creation.patch
mm-damon-core-avoid-holes-in-newly-set-monitoring-target-ranges.patch
mm-damon-core-test-test-damon_set_regions.patch
docs-admin-guide-mm-damon-rename-the-title-of-the-document.patch
mm-damon-kconfig-notify-debugfs-deprecation-plan.patch
docs-admin-guide-mm-damon-start-mention-the-dependency-as-sysfs-instead-of-debugfs.patch
docs-admin-guide-mm-damon-usage-note-damon-debugfs-interface-deprecation-plan.patch
