diff mbox series

[bpf-next,v4,01/18] bpf: add new map ops ->map_mem_usage

Message ID 20230305124615.12358-2-laoar.shao@gmail.com (mailing list archive)
State Accepted
Commit 90a5527d7686d3ebe0dd2a831356a6c7d7dc31bc
Delegated to: BPF
Headers show
Series bpf: bpf memory usage | expand

Checks

Context Check Description
netdev/series_format fail Series longer than 15 patches (and no cover letter)
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1429 this patch: 1429
netdev/cc_maintainers warning 2 maintainers not CCed: song@kernel.org martin.lau@linux.dev
netdev/build_clang success Errors and warnings before: 151 this patch: 151
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1424 this patch: 1424
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 45 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
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bpf/vmtest-bpf-next-PR success PR summary

Commit Message

Yafang Shao March 5, 2023, 12:45 p.m. UTC 
Add a new map ops ->map_mem_usage to print the memory usage of a
bpf map.

This is a preparation for the followup change.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
 include/linux/bpf.h  |  2 ++
 kernel/bpf/syscall.c | 15 +++++++--------
 2 files changed, 9 insertions(+), 8 deletions(-)
diff mbox series

Patch

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index d345680..9059520 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -161,6 +161,8 @@  struct bpf_map_ops {
 				     bpf_callback_t callback_fn,
 				     void *callback_ctx, u64 flags);
 
+	u64 (*map_mem_usage)(const struct bpf_map *map);
+
 	/* BTF id of struct allocated by map_alloc */
 	int *map_btf_id;
 
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index eb50025..073957c 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -771,16 +771,15 @@  static fmode_t map_get_sys_perms(struct bpf_map *map, struct fd f)
 }
 
 #ifdef CONFIG_PROC_FS
-/* Provides an approximation of the map's memory footprint.
- * Used only to provide a backward compatibility and display
- * a reasonable "memlock" info.
- */
-static unsigned long bpf_map_memory_footprint(const struct bpf_map *map)
+/* Show the memory usage of a bpf map */
+static u64 bpf_map_memory_usage(const struct bpf_map *map)
 {
 	unsigned long size;
 
-	size = round_up(map->key_size + bpf_map_value_size(map), 8);
+	if (map->ops->map_mem_usage)
+		return map->ops->map_mem_usage(map);
 
+	size = round_up(map->key_size + bpf_map_value_size(map), 8);
 	return round_up(map->max_entries * size, PAGE_SIZE);
 }
 
@@ -803,7 +802,7 @@  static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
 		   "max_entries:\t%u\n"
 		   "map_flags:\t%#x\n"
 		   "map_extra:\t%#llx\n"
-		   "memlock:\t%lu\n"
+		   "memlock:\t%llu\n"
 		   "map_id:\t%u\n"
 		   "frozen:\t%u\n",
 		   map->map_type,
@@ -812,7 +811,7 @@  static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
 		   map->max_entries,
 		   map->map_flags,
 		   (unsigned long long)map->map_extra,
-		   bpf_map_memory_footprint(map),
+		   bpf_map_memory_usage(map),
 		   map->id,
 		   READ_ONCE(map->frozen));
 	if (type) {