Em Wed, Nov 11, 2015 at 07:26:18PM +0100, David Sterba escreveu:
> Hi,
>
> with current git version 1.10 (79536f4f9587703c7136d2654824630689880f5c):
>
> struct btrfs_path {
> struct extent_buffer * nodes[8]; /* 0 64 */
> /* --- cacheline 1 boundary (64 bytes) --- */
> int slots[8]; /* 64 32 */
> int locks[8]; /* 96 32 */
> /* --- cacheline 2 boundary (128 bytes) --- */
> u8 reada; /* 128 1 */
> u8 lowest_level; /* 129 1 */
>
> /* Bitfield combined with previous fields */
>
> unsigned int search_for_split:1; /* 128:15 4 */
> unsigned int keep_locks:1; /* 128:14 4 */
> unsigned int skip_locking:1; /* 128:13 4 */
> unsigned int leave_spinning:1; /* 128:12 4 */
> unsigned int search_commit_root:1; /* 128:11 4 */
> unsigned int need_commit_sem:1; /* 128:10 4 */
> unsigned int skip_release_on_error:1; /* 128: 9 4 */
>
> /* size: 136, cachelines: 3, members: 12 */
> /* padding: 4 */
> /* bit_padding: 25 bits */
> /* last cacheline: 8 bytes */
> /* BRAIN FART ALERT! 136 != 136 + 0(holes), diff = 0 */
> };
> Looks like it's the bitfield combining.
> $ gcc --version
> gcc (SUSE Linux) 4.5.1 20101208 [gcc-4_5-branch revision 167585]
> binutils-2.23.2
> Let me know if you need more information.
Ok, so with:
[acme@zoo linux]$ pahole -C btrfs_path ../build/v4.3.0+/fs/btrfs/btrfs.o
die__process_function: tag not supported 0x4109 (GNU_call_site)!
struct btrfs_path {
struct extent_buffer * nodes[8]; /* 0 64 */
/* --- cacheline 1 boundary (64 bytes) --- */
int slots[8]; /* 64 32 */
int locks[8]; /* 96 32 */
/* --- cacheline 2 boundary (128 bytes) --- */
int reada; /* 128 4 */
int lowest_level; /* 132 4 */
unsigned int search_for_split:1; /* 136:31 4 */
unsigned int keep_locks:1; /* 136:30 4 */
unsigned int skip_locking:1; /* 136:29 4 */
unsigned int leave_spinning:1; /* 136:28 4 */
unsigned int search_commit_root:1; /* 136:27 4 */
unsigned int need_commit_sem:1; /* 136:26 4 */
unsigned int skip_release_on_error:1; /* 136:25 4 */
/* size: 144, cachelines: 3, members: 12 */
/* padding: 4 */
/* bit_padding: 25 bits */
/* last cacheline: 16 bytes */
};
[acme@zoo linux]$
Ok, but then 'reada' and 'lowest_level' are both int in my file, lemme try
converting it and rebuilding...
- Arnaldo
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