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Add kernelcompat for list_lru

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Add kernelcompat helpers for initial use of list_lru for shrinking.  The
most complicated part is the walk callback type changing.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2025-10-29 10:12:52 -07:00
parent 206c24c41f
commit 8b6418fb79
3 changed files with 150 additions and 0 deletions
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kmod/src/kernelcompat.c
+66
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@@ -81,3 +81,69 @@ kc_generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
return written ? written : status;
}
#endif
#include <linux/list_lru.h>
#ifdef KC_LIST_LRU_WALK_CB_ITEM_LOCK
static enum lru_status kc_isolate(struct list_head *item, spinlock_t *lock, void *cb_arg)
{
struct kc_isolate_args *args = cb_arg;
/* isolate doesn't use list, nr_items updated in caller */
return args->isolate(item, NULL, args->cb_arg);
}
unsigned long kc_list_lru_walk(struct list_lru *lru, kc_list_lru_walk_cb_t isolate, void *cb_arg,
unsigned long nr_to_walk)
{
struct kc_isolate_args args = {
.isolate = isolate,
.cb_arg = cb_arg,
};
return list_lru_walk(lru, kc_isolate, &args, nr_to_walk);
}
unsigned long kc_list_lru_shrink_walk(struct list_lru *lru, struct shrink_control *sc,
kc_list_lru_walk_cb_t isolate, void *cb_arg)
{
struct kc_isolate_args args = {
.isolate = isolate,
.cb_arg = cb_arg,
};
return list_lru_shrink_walk(lru, sc, kc_isolate, &args);
}
#endif
#ifdef KC_LIST_LRU_WALK_CB_LIST_LOCK
static enum lru_status kc_isolate(struct list_head *item, struct list_lru_one *list,
spinlock_t *lock, void *cb_arg)
{
struct kc_isolate_args *args = cb_arg;
return args->isolate(item, list, args->cb_arg);
}
unsigned long kc_list_lru_walk(struct list_lru *lru, kc_list_lru_walk_cb_t isolate, void *cb_arg,
unsigned long nr_to_walk)
{
struct kc_isolate_args args = {
.isolate = isolate,
.cb_arg = cb_arg,
};
return list_lru_walk(lru, kc_isolate, &args, nr_to_walk);
}
unsigned long kc_list_lru_shrink_walk(struct list_lru *lru, struct shrink_control *sc,
kc_list_lru_walk_cb_t isolate, void *cb_arg)
{
struct kc_isolate_args args = {
.isolate = isolate,
.cb_arg = cb_arg,
};
return list_lru_shrink_walk(lru, sc, kc_isolate, &args);
}
#endif