b8ee5575f7
damon_sysfs_set_targets() had a bug that can result in unexpected memory usage and monitoring overhead increase. The bug has fixed by a previous commit. Add a unit test for avoiding a similar bug of future. Link: https://lkml.kernel.org/r/20231022210735.46409-3-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Brendan Higgins <brendanhiggins@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Data Access Monitor Unit Tests
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*
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* Author: SeongJae Park <sj@kernel.org>
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*/
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#ifdef CONFIG_DAMON_SYSFS_KUNIT_TEST
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#ifndef _DAMON_SYSFS_TEST_H
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#define _DAMON_SYSFS_TEST_H
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#include <kunit/test.h>
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static unsigned int nr_damon_targets(struct damon_ctx *ctx)
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{
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struct damon_target *t;
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unsigned int nr_targets = 0;
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damon_for_each_target(t, ctx)
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nr_targets++;
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return nr_targets;
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}
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static int __damon_sysfs_test_get_any_pid(int min, int max)
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{
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struct pid *pid;
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int i;
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for (i = min; i <= max; i++) {
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pid = find_get_pid(i);
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if (pid) {
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put_pid(pid);
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return i;
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}
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}
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return -1;
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}
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static void damon_sysfs_test_set_targets(struct kunit *test)
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{
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struct damon_sysfs_targets *sysfs_targets;
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struct damon_sysfs_target *sysfs_target;
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struct damon_ctx *ctx;
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sysfs_targets = damon_sysfs_targets_alloc();
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sysfs_targets->nr = 1;
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sysfs_targets->targets_arr = kmalloc_array(1,
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sizeof(*sysfs_targets->targets_arr), GFP_KERNEL);
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sysfs_target = damon_sysfs_target_alloc();
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sysfs_target->pid = __damon_sysfs_test_get_any_pid(12, 100);
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sysfs_target->regions = damon_sysfs_regions_alloc();
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sysfs_targets->targets_arr[0] = sysfs_target;
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ctx = damon_new_ctx();
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damon_sysfs_set_targets(ctx, sysfs_targets);
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KUNIT_EXPECT_EQ(test, 1u, nr_damon_targets(ctx));
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sysfs_target->pid = __damon_sysfs_test_get_any_pid(
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sysfs_target->pid + 1, 200);
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damon_sysfs_set_targets(ctx, sysfs_targets);
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KUNIT_EXPECT_EQ(test, 1u, nr_damon_targets(ctx));
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damon_destroy_ctx(ctx);
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kfree(sysfs_targets->targets_arr);
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kfree(sysfs_targets);
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kfree(sysfs_target);
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}
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static struct kunit_case damon_sysfs_test_cases[] = {
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KUNIT_CASE(damon_sysfs_test_set_targets),
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{},
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};
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static struct kunit_suite damon_sysfs_test_suite = {
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.name = "damon-sysfs",
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.test_cases = damon_sysfs_test_cases,
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};
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kunit_test_suite(damon_sysfs_test_suite);
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#endif /* _DAMON_SYSFS_TEST_H */
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#endif /* CONFIG_DAMON_SYSFS_KUNIT_TEST */
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