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maple_tree: add benchmarking for mas_prev() 

Add some benchmarking functions in testing for mas_prev().  This is
useful to ensure there are no regressions added during modifications.

Link: https://lkml.kernel.org/r/20230724183157.3939892-3-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Peng Zhang <zhangpeng.00@bytedance.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2023-07-24 14:31:44 -04:00 committed by Andrew Morton
parent 361c678be7
commit 8c314f3b55
1 changed files with 37 additions and 0 deletions
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37
lib/test_maple_tree.c
View File

@ -45,6 +45,7 @@ atomic_t maple_tree_tests_passed;
/* #define BENCH_MT_FOR_EACH */
/* #define BENCH_FORK */
/* #define BENCH_MAS_FOR_EACH */
/* #define BENCH_MAS_PREV */
#ifdef __KERNEL__
#define mt_set_non_kernel(x) do {} while (0)
@ -1801,7 +1802,36 @@ static noinline void __init bench_mas_for_each(struct maple_tree *mt)
}
#endif
#if defined(BENCH_MAS_PREV)
static noinline void __init bench_mas_prev(struct maple_tree *mt)
{
int i, count = 1000000;
unsigned long max = 2500;
void *entry;
MA_STATE(mas, mt, 0, 0);
for (i = 0; i < max; i += 5) {
int gap = 4;
if (i % 30 == 0)
gap = 3;
mtree_store_range(mt, i, i + gap, xa_mk_value(i), GFP_KERNEL);
}
rcu_read_lock();
for (i = 0; i < count; i++) {
unsigned long j = 2495;
mas_set(&mas, ULONG_MAX);
while ((entry = mas_prev(&mas, 0)) != NULL) {
MT_BUG_ON(mt, entry != xa_mk_value(j));
j -= 5;
}
}
rcu_read_unlock();
}
#endif
/* check_forking - simulate the kernel forking sequence with the tree. */
static noinline void __init check_forking(struct maple_tree *mt)
{
@ -3537,6 +3567,13 @@ static int __init maple_tree_seed(void)
mtree_destroy(&tree);
goto skip;
#endif
#if defined(BENCH_MAS_PREV)
#define BENCH
mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
bench_mas_prev(&tree);
mtree_destroy(&tree);
goto skip;
#endif
mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
check_iteration(&tree);