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maple_tree: add test for mas_wr_modify() fast path

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Patch series "Optimize the fast path of mas_store()", v4.

Add fast paths for mas_wr_append() and mas_wr_slot_store() respectively.
The newly added fast path of mas_wr_append() is used in fork() and how
much it benefits fork() depends on how many VMAs are duplicated.

Thanks Liam for the review.


This patch (of 4):

Add tests for all cases of mas_wr_append() and mas_wr_slot_store().

Link: https://lkml.kernel.org/r/20230628073657.75314-1-zhangpeng.00@bytedance.com
Link: https://lkml.kernel.org/r/20230628073657.75314-2-zhangpeng.00@bytedance.com
Signed-off-by: Peng Zhang <zhangpeng.00@bytedance.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peng Zhang 2023-06-28 15:36:54 +08:00 committed by Andrew Morton
parent f04d16ee3a
commit d6e8d0dc19
1 changed files with 65 additions and 0 deletions
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65
lib/test_maple_tree.c
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@ -1157,6 +1157,71 @@ static noinline void __init check_ranges(struct maple_tree *mt)
MT_BUG_ON(mt, !mt_height(mt));
mtree_destroy(mt);
/* Check in-place modifications */
mt_init_flags(mt, MT_FLAGS_ALLOC_RANGE);
/* Append to the start of last range */
mt_set_non_kernel(50);
for (i = 0; i <= 500; i++) {
val = i * 5 + 1;
val2 = val + 4;
check_store_range(mt, val, val2, xa_mk_value(val), 0);
}
/* Append to the last range without touching any boundaries */
for (i = 0; i < 10; i++) {
val = val2 + 5;
val2 = val + 4;
check_store_range(mt, val, val2, xa_mk_value(val), 0);
}
/* Append to the end of last range */
val = val2;
for (i = 0; i < 10; i++) {
val += 5;
MT_BUG_ON(mt, mtree_test_store_range(mt, val, ULONG_MAX,
xa_mk_value(val)) != 0);
}
/* Overwriting the range and over a part of the next range */
for (i = 10; i < 30; i += 2) {
val = i * 5 + 1;
val2 = val + 5;
check_store_range(mt, val, val2, xa_mk_value(val), 0);
}
/* Overwriting a part of the range and over the next range */
for (i = 50; i < 70; i += 2) {
val2 = i * 5;
val = val2 - 5;
check_store_range(mt, val, val2, xa_mk_value(val), 0);
}
/*
* Expand the range, only partially overwriting the previous and
* next ranges
*/
for (i = 100; i < 130; i += 3) {
val = i * 5 - 5;
val2 = i * 5 + 1;
check_store_range(mt, val, val2, xa_mk_value(val), 0);
}
/*
* Expand the range, only partially overwriting the previous and
* next ranges, in RCU mode
*/
mt_set_in_rcu(mt);
for (i = 150; i < 180; i += 3) {
val = i * 5 - 5;
val2 = i * 5 + 1;
check_store_range(mt, val, val2, xa_mk_value(val), 0);
}
MT_BUG_ON(mt, !mt_height(mt));
mt_validate(mt);
mt_set_non_kernel(0);
mtree_destroy(mt);
/* Test rebalance gaps */
mt_init_flags(mt, MT_FLAGS_ALLOC_RANGE);
mt_set_non_kernel(50);