linux-kernel - [RFC v7 5/7] mm/damon-test: Add kunit test case for regions age accounting

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Message-ID: <20200429124540.32232-6-sjpark@amazon.com>
Date:   Wed, 29 Apr 2020 14:45:38 +0200
From:   SeongJae Park <sjpark@...zon.com>
To:     <akpm@...ux-foundation.org>
CC:     SeongJae Park <sjpark@...zon.de>, <Jonathan.Cameron@...wei.com>,
        <aarcange@...hat.com>, <acme@...nel.org>,
        <alexander.shishkin@...ux.intel.com>, <amit@...nel.org>,
        <benh@...nel.crashing.org>, <brendan.d.gregg@...il.com>,
        <brendanhiggins@...gle.com>, <cai@....pw>,
        <colin.king@...onical.com>, <corbet@....net>, <dwmw@...zon.com>,
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        <yang.shi@...ux.alibaba.com>, <ying.huang@...el.com>,
        <linux-damon@...zon.com>, <linux-mm@...ck.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [RFC v7 5/7] mm/damon-test: Add kunit test case for regions age accounting

From: SeongJae Park <sjpark@...zon.de>

After merges of regions, each region should know their last shape in
proper way to measure the changes from the last modification and reset
the age if the changes are significant.  This commit adds kunit test
cases checking whether the regions are knowing their last shape properly
after merges of regions.

Signed-off-by: SeongJae Park <sjpark@...zon.de>
Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>
---
 mm/damon-test.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/damon-test.h b/mm/damon-test.h
index 439ffce783f6..780094deea05 100644
--- a/mm/damon-test.h
+++ b/mm/damon-test.h
@@ -551,6 +551,8 @@ static void damon_test_merge_regions_of(struct kunit *test)
 
 	unsigned long saddrs[] = {0, 114, 130, 156, 170};
 	unsigned long eaddrs[] = {112, 130, 156, 170, 230};
+	unsigned long lsa[] = {0, 114, 130, 156, 184};
+	unsigned long lea[] = {100, 122, 156, 170, 230};
 	int i;
 
 	t = damon_new_task(42);
@@ -567,6 +569,9 @@ static void damon_test_merge_regions_of(struct kunit *test)
 		r = __nth_region_of(t, i);
 		KUNIT_EXPECT_EQ(test, r->vm_start, saddrs[i]);
 		KUNIT_EXPECT_EQ(test, r->vm_end, eaddrs[i]);
+		KUNIT_EXPECT_EQ(test, r->last_vm_start, lsa[i]);
+		KUNIT_EXPECT_EQ(test, r->last_vm_end, lea[i]);
+
 	}
 	damon_free_task(t);
 }
-- 
2.17.1