<s>
The	O
O(n )	O
scheduler	O
is	O
the	O
scheduler	O
used	O
in	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
between	O
versions	O
2.4	O
and	O
2.6	O
.	O
</s>
<s>
Since	O
version	O
2.6.0	O
,	O
it	O
has	O
been	O
replaced	O
by	O
the	O
O(1 )	O
scheduler	O
and	O
in	O
2.6.23	O
by	O
the	O
current	O
Completely	B-Application
Fair	I-Application
Scheduler	I-Application
(	O
CFS	O
)	O
.	O
</s>
<s>
Within	O
each	O
epoch	O
,	O
every	O
task	B-Operating_System
can	O
execute	O
up	O
to	O
its	O
time	O
slice	O
.	O
</s>
<s>
If	O
a	O
task	B-Operating_System
does	O
not	O
use	O
all	O
of	O
its	O
time	O
slice	O
,	O
then	O
the	O
scheduler	O
adds	O
half	O
of	O
the	O
remaining	O
time	O
slice	O
to	O
allow	O
it	O
to	O
execute	O
longer	O
in	O
the	O
next	O
epoch	O
.	O
</s>
<s>
Picking	O
the	O
next	O
task	B-Operating_System
to	O
run	O
requires	O
iteration	O
through	O
all	O
currently	O
planned	O
tasks	O
,	O
so	O
the	O
scheduler	O
runs	O
in	O
O(n )	O
time	O
,	O
where	O
n	O
is	O
the	O
number	O
of	O
the	O
planned	O
processes	O
.	O
</s>
