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mm/damon/tests/core-kunit: add a test for damon_commit_ctx()

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Patch series "mm/damon: test and document power-of-2 min_region_sz
requirement".

Since commit c80f46ac22 ("mm/damon/core: disallow non-power of two
min_region_sz"), min_region_sz is always restricted to be a power of two. 
Add a kunit test to confirm the functionality.  Also, the change adds a
restriction to addr_unit parameter.  Clarify it on the document.


This patch (of 2):

Add a kunit test for confirming the change that is made on commit
c80f46ac22 ("mm/damon/core: disallow non-power of two min_region_sz")
functions as expected.

Link: https://lkml.kernel.org/r/20260307194222.202075-2-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2026-03-07 11:42:20 -08:00 committed by Andrew Morton
parent 300252ebb1
commit a260de7d45
1 changed files with 22 additions and 0 deletions
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22
mm/damon/tests/core-kunit.h
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@ -1057,6 +1057,27 @@ static void damon_test_commit_target_regions(struct kunit *test)
(unsigned long[][2]) {{3, 8}, {8, 10}}, 2);
}
static void damon_test_commit_ctx(struct kunit *test)
{
struct damon_ctx *src, *dst;
src = damon_new_ctx();
if (!src)
kunit_skip(test, "src alloc fail");
dst = damon_new_ctx();
if (!dst) {
damon_destroy_ctx(src);
kunit_skip(test, "dst alloc fail");
}
/* Only power of two min_region_sz is allowed. */
src->min_region_sz = 4096;
KUNIT_EXPECT_EQ(test, damon_commit_ctx(dst, src), 0);
src->min_region_sz = 4095;
KUNIT_EXPECT_EQ(test, damon_commit_ctx(dst, src), -EINVAL);
damon_destroy_ctx(src);
damon_destroy_ctx(dst);
}
static void damos_test_filter_out(struct kunit *test)
{
struct damon_target *t;
@ -1313,6 +1334,7 @@ static struct kunit_case damon_test_cases[] = {
KUNIT_CASE(damos_test_commit_pageout),
KUNIT_CASE(damos_test_commit_migrate_hot),
KUNIT_CASE(damon_test_commit_target_regions),
KUNIT_CASE(damon_test_commit_ctx),
KUNIT_CASE(damos_test_filter_out),
KUNIT_CASE(damon_test_feed_loop_next_input),
KUNIT_CASE(damon_test_set_filters_default_reject),