Current pahole output (offsets/size on right):
struct cache_disk_superblock {
__le32 csum; /* 0 4 */
__le32 flags; /* 4 4 */
__le64 blocknr; /* 8 8 */
__u8 uuid[16]; /* 16 16 */
__le64 magic; /* 32 8 */
__le32 version; /* 40 4 */
__u8 policy_name[16]; /* 44 16 */
__le32 policy_hint_size; /* 60 4 */
/* --- cacheline 1 boundary (64 bytes) --- */
__u8 metadata_space_map_root[128]; /* 64 128 */
/* --- cacheline 3 boundary (192 bytes) --- */
__le64 mapping_root; /* 192 8 */
__le64 hint_root; /* 200 8 */
__le64 discard_root; /* 208 8 */
__le64 discard_block_size; /* 216 8 */
__le64 discard_nr_blocks; /* 224 8 */
__le32 data_block_size; /* 232 4 */
__le32 metadata_block_size; /* 236 4 */
__le32 cache_blocks; /* 240 4 */
__le32 compat_flags; /* 244 4 */
__le32 compat_ro_flags; /* 248 4 */
__le32 incompat_flags; /* 252 4 */
/* --- cacheline 4 boundary (256 bytes) --- */
__le32 read_hits; /* 256 4 */
__le32 read_misses; /* 260 4 */
__le32 write_hits; /* 264 4 */
__le32 write_misses; /* 268 4 */
__le32 policy_version[3]; /* 272 12 */
/* size: 288, cachelines: 5, members: 25 */
/* padding: 4 */
/* last cacheline: 32 bytes */
};
Alasdair
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