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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-09-22 09:34:56 +02:00
Paolo Abeni
bf1c3ab8d3
the flowi* structures are used and memsetted by server functions
in critical path. Currently flowi_common has a couple of holes that
we can eliminate reordering the struct fields. As a side effect,
both flowi4 and flowi6 shrink by 8 bytes.
Before:
pahole -EC flowi_common
struct flowi_common {
// ...
/* size: 40, cachelines: 1, members: 10 */
/* sum members: 32, holes: 1, sum holes: 4 */
/* padding: 4 */
/* last cacheline: 40 bytes */
};
pahole -EC flowi6
struct flowi6 {
// ...
/* size: 88, cachelines: 2, members: 6 */
/* padding: 4 */
/* last cacheline: 24 bytes */
};
pahole -EC flowi4
struct flowi4 {
// ...
/* size: 56, cachelines: 1, members: 4 */
/* padding: 4 */
/* last cacheline: 56 bytes */
};
After:
struct flowi_common {
// ...
/* size: 32, cachelines: 1, members: 10 */
/* last cacheline: 32 bytes */
};
struct flowi6 {
// ...
/* size: 80, cachelines: 2, members: 6 */
/* padding: 4 */
/* last cacheline: 16 bytes */
};
struct flowi4 {
// ...
/* size: 48, cachelines: 1, members: 4 */
/* padding: 4 */
/* last cacheline: 48 bytes */
};
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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.