diff options
| author | Peng Zhang <zhangpeng.00@bytedance.com> | 2023-07-18 15:30:19 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-18 10:12:39 -0700 |
| commit | cabdf74e6b319c989eb8e812f1854291ae0af1c0 (patch) | |
| tree | 46575c9410c293eb2c3bacec52621f00d8a1ce67 /mm/kfence/kfence.h | |
| parent | 8d3a7d797c1a18a24f602a7398103ee894c5bc3b (diff) | |
mm: kfence: allocate kfence_metadata at runtime
kfence_metadata is currently a static array. For the purpose of
allocating scalable __kfence_pool, we first change it to runtime
allocation of metadata. Since the size of an object of kfence_metadata is
1160 bytes, we can save at least 72 pages (with default 256 objects)
without enabling kfence.
[akpm@linux-foundation.org: restore newline, per Marco]
Link: https://lkml.kernel.org/r/20230718073019.52513-1-zhangpeng.00@bytedance.com
Signed-off-by: Peng Zhang <zhangpeng.00@bytedance.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kfence/kfence.h')
| -rw-r--r-- | mm/kfence/kfence.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/kfence/kfence.h b/mm/kfence/kfence.h index 392fb273e7bd..f46fbb03062b 100644 --- a/mm/kfence/kfence.h +++ b/mm/kfence/kfence.h @@ -102,7 +102,10 @@ struct kfence_metadata { #endif }; -extern struct kfence_metadata kfence_metadata[CONFIG_KFENCE_NUM_OBJECTS]; +#define KFENCE_METADATA_SIZE PAGE_ALIGN(sizeof(struct kfence_metadata) * \ + CONFIG_KFENCE_NUM_OBJECTS) + +extern struct kfence_metadata *kfence_metadata; static inline struct kfence_metadata *addr_to_metadata(unsigned long addr) { |