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Diffstat (limited to 'Documentation/admin-guide/cgroup-v2.rst')
| -rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index cf88c1f98270..3b29005aa981 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -9,7 +9,7 @@ This is the authoritative documentation on the design, interface and conventions of cgroup v2. It describes all userland-visible aspects of cgroup including core and specific controller behaviors. All future changes must be reflected in this document. Documentation for -v1 is available under Documentation/cgroup-v1/. +v1 is available under Documentation/admin-guide/cgroup-v1/. .. CONTENTS @@ -705,6 +705,12 @@ Conventions informational files on the root cgroup which end up showing global information available elsewhere shouldn't exist. +- The default time unit is microseconds. If a different unit is ever + used, an explicit unit suffix must be present. + +- A parts-per quantity should use a percentage decimal with at least + two digit fractional part - e.g. 13.40. + - If a controller implements weight based resource distribution, its interface file should be named "weight" and have the range [1, 10000] with 100 as the default. The values are chosen to allow @@ -1008,7 +1014,7 @@ All time durations are in microseconds. A read-only nested-key file which exists on non-root cgroups. Shows pressure stall information for CPU. See - Documentation/accounting/psi.txt for details. + Documentation/accounting/psi.rst for details. Memory @@ -1140,6 +1146,11 @@ PAGE_SIZE multiple when read back. otherwise, a value change in this file generates a file modified event. + Note that all fields in this file are hierarchical and the + file modified event can be generated due to an event down the + hierarchy. For for the local events at the cgroup level see + memory.events.local. + low The number of times the cgroup is reclaimed due to high memory pressure even though its usage is under @@ -1179,6 +1190,11 @@ PAGE_SIZE multiple when read back. The number of processes belonging to this cgroup killed by any kind of OOM killer. + memory.events.local + Similar to memory.events but the fields in the file are local + to the cgroup i.e. not hierarchical. The file modified event + generated on this file reflects only the local events. + memory.stat A read-only flat-keyed file which exists on non-root cgroups. @@ -1339,7 +1355,7 @@ PAGE_SIZE multiple when read back. A read-only nested-key file which exists on non-root cgroups. Shows pressure stall information for memory. See - Documentation/accounting/psi.txt for details. + Documentation/accounting/psi.rst for details. Usage Guidelines @@ -1482,7 +1498,7 @@ IO Interface Files A read-only nested-key file which exists on non-root cgroups. Shows pressure stall information for IO. See - Documentation/accounting/psi.txt for details. + Documentation/accounting/psi.rst for details. Writeback @@ -2108,7 +2124,7 @@ following two functions. a queue (device) has been associated with the bio and before submission. - wbc_account_io(@wbc, @page, @bytes) + wbc_account_cgroup_owner(@wbc, @page, @bytes) Should be called for each data segment being written out. While this function doesn't care exactly when it's called during the writeback session, it's the easiest and most |