<s>
In	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
,	O
kernfs	B-Application
is	O
a	O
set	O
of	O
functions	O
that	O
contain	O
the	O
functionality	O
required	O
for	O
creating	O
the	O
pseudo	B-Application
file	I-Application
systems	I-Application
used	O
internally	O
by	O
various	O
kernel	B-Operating_System
subsystems	O
so	O
that	O
they	O
may	O
use	O
virtual	O
files	O
.	O
</s>
<s>
For	O
example	O
,	O
sysfs	B-Application
provides	O
a	O
set	O
of	O
virtual	O
files	O
by	O
exporting	O
information	O
about	O
hardware	O
devices	O
and	O
associated	O
device	B-Application
drivers	I-Application
from	O
the	O
kernel	B-Operating_System
's	O
device	O
model	O
to	O
user	B-Operating_System
space	I-Operating_System
.	O
</s>
<s>
The	O
creation	O
of	O
kernfs	B-Application
resulted	O
from	O
splitting	O
off	O
part	O
of	O
the	O
internal	O
logic	O
used	O
by	O
sysfs	B-Application
.	O
</s>
<s>
The	O
associated	O
patchset	O
,	O
with	O
Tejun	O
Heo	O
as	O
its	O
main	O
author	O
,	O
was	O
merged	O
into	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
mainline	O
in	O
kernel	B-Operating_System
version	O
3.14	O
,	O
which	O
was	O
released	O
on	O
March	O
30	O
,	O
2014	O
.	O
</s>
<s>
Kernfs	B-Application
took	O
the	O
independent	O
and	O
reusable	O
functionality	O
of	O
sysfs	B-Application
so	O
other	O
kernel	B-Operating_System
subsystems	O
can	O
implement	O
their	O
own	O
pseudo	B-Application
file	I-Application
systems	I-Application
more	O
easily	O
and	O
consistently	O
.	O
</s>
<s>
One	O
of	O
the	O
primary	O
users	O
of	O
kernfs	B-Application
is	O
the	O
pseudo	B-Application
file	I-Application
system	I-Application
used	O
internally	O
by	O
cgroups	B-Application
,	O
whose	O
redesign	O
continued	O
into	O
version	O
3.15	O
of	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
.	O
</s>
