mirror of
https://github.com/torvalds/linux.git
synced 2026-07-31 11:37:06 +02:00
Linux kernel source tree
321f4992c1
We can reduce two members' size that in turn reduce size of struct
btrfs_ref from 64 to 56 bytes. As the structure is often used as a local
variable several functions reduce their stack usage.
- make enum btrfs_ref_type packed, there are only 4 values
- switch action and its values to a packed enum
Final structure layout:
struct btrfs_ref {
enum btrfs_ref_type type; /* 0 1 */
enum btrfs_delayed_ref_action action; /* 1 1 */
bool skip_qgroup; /* 2 1 */
/* XXX 5 bytes hole, try to pack */
u64 bytenr; /* 8 8 */
u64 len; /* 16 8 */
u64 parent; /* 24 8 */
union {
struct btrfs_data_ref data_ref; /* 32 24 */
struct btrfs_tree_ref tree_ref; /* 32 16 */
}; /* 32 24 */
/* size: 56, cachelines: 1, members: 7 */
/* sum members: 51, holes: 1, sum holes: 5 */
/* last cacheline: 56 bytes */
};
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.