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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
2025-09-10 16:40:18 -07:00
parent 206c24c41f
commit 8b6418fb79
3 changed files with 150 additions and 0 deletions
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37
kmod/src/Makefile.kernelcompat
View File

@@ -425,3 +425,40 @@ endif
ifneq (,$(shell grep 'int ..remap_pages..struct vm_area_struct' include/linux/mm.h))
ccflags-y += -DKC_MM_REMAP_PAGES
endif
#
# v3.19-4742-g503c358cf192
#
# list_lru_shrink_count() and list_lru_shrink_walk() introduced
#
ifneq (,$(shell grep 'list_lru_shrink_count.*struct list_lru' include/linux/list_lru.h))
ccflags-y += -DKC_LIST_LRU_SHRINK_COUNT_WALK
endif
#
# v3.19-4757-g3f97b163207c
#
# lru_list_walk_cb lru arg added
#
ifneq (,$(shell grep 'struct list_head \*item, spinlock_t \*lock, void \*cb_arg' include/linux/list_lru.h))
ccflags-y += -DKC_LIST_LRU_WALK_CB_ITEM_LOCK
endif
#
# v6.7-rc4-153-g0a97c01cd20b
#
# list_lru_{add,del} -> list_lru_{add,del}_obj
#
ifneq (,$(shell grep '^bool list_lru_add_obj' include/linux/list_lru.h))
ccflags-y += -DKC_LIST_LRU_ADD_OBJ
endif
#
# v6.12-rc6-227-gda0c02516c50
#
# lru_list_walk_cb lock arg removed
#
ifneq (,$(shell grep 'struct list_lru_one \*list, spinlock_t \*lock, void \*cb_arg' include/linux/list_lru.h))
ccflags-y += -DKC_LIST_LRU_WALK_CB_LIST_LOCK
endif

66
kmod/src/kernelcompat.c
View File

@@ -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

47
kmod/src/kernelcompat.h
View File

@@ -410,4 +410,51 @@ static inline vm_fault_t vmf_error(int err)
}
#endif
#include <linux/list_lru.h>
#ifndef KC_LIST_LRU_SHRINK_COUNT_WALK
/* we don't bother with sc->{nid,memcg} (which doesn't exist in oldest kernels) */
static inline unsigned long list_lru_shrink_count(struct list_lru *lru,
struct shrink_control *sc)
{
return list_lru_count(lru);
}
static inline unsigned long
list_lru_shrink_walk(struct list_lru *lru, struct shrink_control *sc,
list_lru_walk_cb isolate, void *cb_arg)
{
return list_lru_walk(lru, isolate, cb_arg, sc->nr_to_scan);
}
#endif
#ifndef KC_LIST_LRU_ADD_OBJ
#define list_lru_add_obj list_lru_add
#define list_lru_del_obj list_lru_del
#endif
#if defined(KC_LIST_LRU_WALK_CB_LIST_LOCK) || defined(KC_LIST_LRU_WALK_CB_ITEM_LOCK)
struct list_lru_one;
typedef enum lru_status (*kc_list_lru_walk_cb_t)(struct list_head *item, struct list_lru_one *list,
void *cb_arg);
struct kc_isolate_args {
kc_list_lru_walk_cb_t isolate;
void *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);
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);
#else
#define kc_list_lru_shrink_walk list_lru_shrink_walk
#endif
#if defined(KC_LIST_LRU_WALK_CB_ITEM_LOCK)
/* isolate moved by hand, nr_items updated in walk as _REMOVE returned */
static inline void list_lru_isolate_move(struct list_lru_one *list, struct list_head *item,
struct list_head *head)
{
list_move(item, head);
}
#endif
#endif