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84208b8fa3Mateusz Guzik <mjguzik@gmail.com> says:
quote:
When utilized it dodges strlen() in vfs_readlink(), giving about 1.5%
speed up when issuing readlink on /initrd.img on ext4.
The size is stored in a union with i_devices, which is never looked at
unless the inode is for a device.
ext4 and tmpfs are patched, other filesystems can also get there with
some more work.
benchmark:
plug into will-it-scale into tests/readlink1.c:
char *testcase_description = "readlink /initrd.img";
void testcase(unsigned long long *iterations, unsigned long nr)
{
char *tmplink = "/initrd.img";
char buf[1024];
while (1) {
int error = readlink(tmplink, buf, sizeof(buf));
assert(error > 0);
(*iterations)++;
}
}
* patches from https://lore.kernel.org/r/20241120112037.822078-1-mjguzik@gmail.com:
tmpfs: use inode_set_cached_link()
ext4: use inode_set_cached_link()
vfs: support caching symlink lengths in inodes
Link: https://lore.kernel.org/r/20241120112037.822078-1-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
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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 reStructuredText 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.