990194fe2f
Cgroup attributes are set from three different contexts:
(1) From the process that creates the cgroup directories. These
processes are /system/bin/init, zygote and zygote64.
(2) From the created process. Some but not all created processes have
user ID and/or group ID 'system'.
(3) The system_server process modifies certain cgroup attributes from
other processes.
Allow all processes from the system group, including system_server, to
modify cgroup attributes from other processes. As one can see in
init.rc, that file includes commands for granting the system group
write permission for blkcg attributes. See also
https://cs.android.com/android/platform/superproject/+/master:system/core/rootdir/init.rc
Bug: 213617178
Test: Verified in the Cuttlefish emulator that this patch makes the
Test: io.bfq.weight write errors disappear from logcat.
Change-Id: Idbfb49c25afec12b21daea7a17db5322bc981ff0
Signed-off-by: Bart Van Assche <bvanassche@google.com>
45 lines
803 B
JSON
45 lines
803 B
JSON
{
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"Cgroups": [
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{
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"Controller": "blkio",
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"Path": "/dev/blkio",
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"Mode": "0775",
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"UID": "system",
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"GID": "system"
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},
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{
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"Controller": "cpu",
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"Path": "/dev/cpuctl",
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"Mode": "0755",
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"UID": "system",
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"GID": "system"
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},
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{
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"Controller": "cpuset",
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"Path": "/dev/cpuset",
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"Mode": "0755",
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"UID": "system",
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"GID": "system"
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},
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{
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"Controller": "memory",
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"Path": "/dev/memcg",
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"Mode": "0700",
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"UID": "root",
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"GID": "system",
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"Optional": true
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}
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],
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"Cgroups2": {
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"Path": "/sys/fs/cgroup",
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"Mode": "0775",
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"UID": "system",
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"GID": "system",
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"Controllers": [
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{
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"Controller": "freezer",
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"Path": "."
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}
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]
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}
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}
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