Documentation/scheduler/sched-bwc.rst

2 CFS Bandwidth Control
5 [ This document only discusses CPU bandwidth control for SCHED_NORMAL.
8 CFS bandwidth control is a CONFIG_FAIR_GROUP_SCHED extension which allows the
9 specification of the maximum CPU bandwidth available to a group or hierarchy.
11 The bandwidth allowed for a group is specified using a quota and period. Within
20 cfs_quota units at each period boundary. As threads consume this bandwidth it
38 bandwidth restriction in place, such a group is described as an unconstrained
39 bandwidth group. This represents the traditional work-conserving behavior for
42 Writing any (valid) positive value(s) will enact the specified bandwidth limit.
45 bandwidth limits are used in a hierarchical fashion, these are explained in
48 Writing any negative value to cpu.cfs_quota_us will remove the bandwidth limit
51 Any updates to a group's bandwidth specification will result in it becoming
70 A group's bandwidth statistics are exported via 3 fields in cpu.stat.
83 The interface enforces that an individual entity's bandwidth is always
90 [ Where C is the parent's bandwidth, and c_i its children ]
101 CFS Bandwidth Quota Caveats