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xarray: Add XArray iterators

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The xa_for_each iterator allows the user to efficiently walk a range
of the array, executing the loop body once for each entry in that
range that matches the filter.  This commit also includes xa_find()
and xa_find_after() which are helper functions for xa_for_each() but
may also be useful in their own right.

In the xas family of functions, we have xas_for_each(), xas_find(),
xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(),
xas_next_tagged() and xas_pause().

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox
2017-11-14 08:30:11 -05:00
parent 41aec91f55
commit b803b42823
3 changed files with 640 additions and 0 deletions
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183
lib/test_xarray.c
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@@ -75,6 +75,48 @@ static noinline void check_xa_err(struct xarray *xa)
// XA_BUG_ON(xa, xa_err(xa_store(xa, 0, xa_mk_internal(0), 0)) != -EINVAL);
}
static noinline void check_xas_retry(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
void *entry;
xa_store_index(xa, 0, GFP_KERNEL);
xa_store_index(xa, 1, GFP_KERNEL);
rcu_read_lock();
XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_value(0));
xa_erase_index(xa, 1);
XA_BUG_ON(xa, !xa_is_retry(xas_reload(&xas)));
XA_BUG_ON(xa, xas_retry(&xas, NULL));
XA_BUG_ON(xa, xas_retry(&xas, xa_mk_value(0)));
xas_reset(&xas);
XA_BUG_ON(xa, xas.xa_node != XAS_RESTART);
XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
XA_BUG_ON(xa, xas.xa_node != NULL);
XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, !xa_is_internal(xas_reload(&xas)));
xas.xa_node = XAS_RESTART;
XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
rcu_read_unlock();
/* Make sure we can iterate through retry entries */
xas_lock(&xas);
xas_set(&xas, 0);
xas_store(&xas, XA_RETRY_ENTRY);
xas_set(&xas, 1);
xas_store(&xas, XA_RETRY_ENTRY);
xas_set(&xas, 0);
xas_for_each(&xas, entry, ULONG_MAX) {
xas_store(&xas, xa_mk_value(xas.xa_index));
}
xas_unlock(&xas);
xa_erase_index(xa, 0);
xa_erase_index(xa, 1);
}
static noinline void check_xa_load(struct xarray *xa)
{
unsigned long i, j;
@@ -217,6 +259,44 @@ static noinline void check_cmpxchg(struct xarray *xa)
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_xas_erase(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
void *entry;
unsigned long i, j;
for (i = 0; i < 200; i++) {
for (j = i; j < 2 * i + 17; j++) {
xas_set(&xas, j);
do {
xas_lock(&xas);
xas_store(&xas, xa_mk_value(j));
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
}
xas_set(&xas, ULONG_MAX);
do {
xas_lock(&xas);
xas_store(&xas, xa_mk_value(0));
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
xas_lock(&xas);
xas_store(&xas, NULL);
xas_set(&xas, 0);
j = i;
xas_for_each(&xas, entry, ULONG_MAX) {
XA_BUG_ON(xa, entry != xa_mk_value(j));
xas_store(&xas, NULL);
j++;
}
xas_unlock(&xas);
XA_BUG_ON(xa, !xa_empty(xa));
}
}
static noinline void check_multi_store(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
@@ -285,16 +365,119 @@ static noinline void check_multi_store(struct xarray *xa)
#endif
}
static noinline void check_multi_find(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned long index;
xa_store_order(xa, 12, 2, xa_mk_value(12), GFP_KERNEL);
XA_BUG_ON(xa, xa_store_index(xa, 16, GFP_KERNEL) != NULL);
index = 0;
XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(12));
XA_BUG_ON(xa, index != 12);
index = 13;
XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(12));
XA_BUG_ON(xa, (index < 12) || (index >= 16));
XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(16));
XA_BUG_ON(xa, index != 16);
xa_erase_index(xa, 12);
xa_erase_index(xa, 16);
XA_BUG_ON(xa, !xa_empty(xa));
#endif
}
static noinline void check_multi_find_2(struct xarray *xa)
{
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 10 : 1;
unsigned int i, j;
void *entry;
for (i = 0; i < max_order; i++) {
unsigned long index = 1UL << i;
for (j = 0; j < index; j++) {
XA_STATE(xas, xa, j + index);
xa_store_index(xa, index - 1, GFP_KERNEL);
xa_store_order(xa, index, i, xa_mk_value(index),
GFP_KERNEL);
rcu_read_lock();
xas_for_each(&xas, entry, ULONG_MAX) {
xa_erase_index(xa, index);
}
rcu_read_unlock();
xa_erase_index(xa, index - 1);
XA_BUG_ON(xa, !xa_empty(xa));
}
}
}
static noinline void check_find(struct xarray *xa)
{
unsigned long i, j, k;
XA_BUG_ON(xa, !xa_empty(xa));
/*
* Check xa_find with all pairs between 0 and 99 inclusive,
* starting at every index between 0 and 99
*/
for (i = 0; i < 100; i++) {
XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
xa_set_mark(xa, i, XA_MARK_0);
for (j = 0; j < i; j++) {
XA_BUG_ON(xa, xa_store_index(xa, j, GFP_KERNEL) !=
NULL);
xa_set_mark(xa, j, XA_MARK_0);
for (k = 0; k < 100; k++) {
unsigned long index = k;
void *entry = xa_find(xa, &index, ULONG_MAX,
XA_PRESENT);
if (k <= j)
XA_BUG_ON(xa, index != j);
else if (k <= i)
XA_BUG_ON(xa, index != i);
else
XA_BUG_ON(xa, entry != NULL);
index = k;
entry = xa_find(xa, &index, ULONG_MAX,
XA_MARK_0);
if (k <= j)
XA_BUG_ON(xa, index != j);
else if (k <= i)
XA_BUG_ON(xa, index != i);
else
XA_BUG_ON(xa, entry != NULL);
}
xa_erase_index(xa, j);
XA_BUG_ON(xa, xa_get_mark(xa, j, XA_MARK_0));
XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
}
xa_erase_index(xa, i);
XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_0));
}
XA_BUG_ON(xa, !xa_empty(xa));
check_multi_find(xa);
check_multi_find_2(xa);
}
static DEFINE_XARRAY(array);
static int xarray_checks(void)
{
check_xa_err(&array);
check_xas_retry(&array);
check_xa_load(&array);
check_xa_mark(&array);
check_xa_shrink(&array);
check_xas_erase(&array);
check_cmpxchg(&array);
check_multi_store(&array);
check_find(&array);
printk("XArray: %u of %u tests passed\n", tests_passed, tests_run);
return (tests_run == tests_passed) ? 0 : -EINVAL;