ionice: a little cleanup of "none" description

We practically have three io scheduling classes. The "none" is
de facto "best-effort" class for processes that has not asked
for io priority.

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/schedutils/ionice.1 b/schedutils/ionice.1
index aef40c38e860d1ad592cec560ad51b0c77b7628b..7f410c6f124606b1ecead3587bc7c88804f72a00 100644 (file)
--- a/schedutils/ionice.1
+++ b/schedutils/ionice.1
@@ -11,7 +11,7 @@ This program sets or gets the io scheduling class and priority for a program.
 If no arguments or just \fI-p\fR is given, \fIionice\fR will query the current
 io scheduling class and priority for that process.
 
-As of this writing, a process can be in one of four scheduling classes:
+As of this writing, a process can be in one of three scheduling classes:
 
 .IP "\fBIdle\fP"
 A program running with idle io priority will only get disk time when no other
@@ -21,12 +21,18 @@ class does not take a priority argument. Presently, this scheduling class
 is permitted for an ordinary user (since kernel 2.6.25).
 
 .IP "\fBBest effort\fP"
-This is the effective scheduling class for any process that hasn't asked for
+This is the effective scheduling class for any process that has not asked for
 a specific io priority.
 This class takes a priority argument from \fI0-7\fR, with lower
 number being higher priority. Programs running at the same best effort
 priority are served in a round-robin fashion.
 
+The processes that has not asked for io priority formally use "\fBnone\fP" as a
+scheduling class, but the io scheduler will treat such processes as if they
+were in the best effort class. The priority within the best effort class will
+be dynamically derived from the cpu nice level of the process: io_priority =
+(cpu_nice + 20) / 5.
+
 .IP "\fBReal time\fP"
 The RT scheduling class is given first access to the disk, regardless of
 what else is going on in the system. Thus the RT class needs to be used with
@@ -35,14 +41,6 @@ some care, as it can starve other processes. As with the best effort class,
 will receive on each scheduling window. This scheduling class is not
 permitted for an ordinary (i.e., non-root) user.
 
-.IP "\fBNone\fP"
-A process that that hasn't asked for a specific io priority will formally be
-in this class. The io scheduler will treat a process that is in this class as
-if it were in the best effort class. The priority within the best effort
-class will be dynamically derived from the cpu nice level of the process:
-io_priority = (cpu_nice + 20) / 5
-
-
 .SH OPTIONS
 .IP "\fB-c \fIclass\fP"
 The scheduling class. \fI1\fR for real time, \fI2\fR for best-effort, \fI3\fR for idle.