Add support for blkio cgroups on Linux

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 9b3a6848e11c1a43867cd5da6a666ecff12df444..7a7d14ea0816080d794d25f4d899603e2eee57a8 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -994,6 +994,7 @@ gtod_cpu=int        Sometimes it's cheaper to dedicate a single thread of
                for doing these time calls will be excluded from other
                uses. Fio will manually clear it from the CPU mask of other
                jobs.
+
 continue_on_error=bool Normally fio will exit the job on the first observed
                failure. If this option is set, fio will continue the job when
                there is a 'non-fatal error' (EIO or EILSEQ) until the runtime
@@ -1003,6 +1004,21 @@ continue_on_error=bool   Normally fio will exit the job on the first observed
                given in the stats is the first error that was hit during the
                run.
 
+cgroup_root=str        Root of the mounted blkio cgroup file systems. This is a Linux
+               specific IO controller. If your system doesn't have it mounted,
+               you can do so with:
+
+               # mount -t cgroup -o blkio none /cgroup
+
+               The cgroup_root defaults to /cgroup, if mounted elsewhere
+               please specify this option.
+
+cgroup=str     Add job to this control group. If it doesn't exist, it will
+               be created.
+
+cgroup_weight=int      Set the weight of the cgroup to this value. See
+               the documentation that comes with the kernel, allowed values
+               are in the range of 100..1000.
 
 6.0 Interpreting the output
 ---------------------------