How do I read the systemd MemoryHigh value from the /sys/fs/cgroup filesystem?
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I have a systemd service that sets MemoryHigh and MemoryMax. If I look under its cgroup in /sys/fs/cgroup/memory the memory.limit_in_bytes file matches the limit set by MemoryMax, but where do I find the value set by MemoryHigh? There is a file named memory.soft_limit_in_bytes so I expected it to be that, but its value is always 9223372036854771712 (8 EB?).
The doc for MemoryHigh says
This controls the "memory.high" control group attribute
but there is no file with that name.
This is on Ubuntu 18.04.
systemd cgroups
edited Feb 5 at 16:09
Stephen Kitt
173k24397472
asked Feb 5 at 16:04
EM0EM0
1635
add a comment |
I have a systemd service that sets MemoryHigh and MemoryMax. If I look under its cgroup in /sys/fs/cgroup/memory the memory.limit_in_bytes file matches the limit set by MemoryMax, but where do I find the value set by MemoryHigh? There is a file named memory.soft_limit_in_bytes so I expected it to be that, but its value is always 9223372036854771712 (8 EB?).
The doc for MemoryHigh says
This controls the "memory.high" control group attribute
but there is no file with that name.
This is on Ubuntu 18.04.
systemd cgroups
edited Feb 5 at 16:09
Stephen Kitt
173k24397472
asked Feb 5 at 16:04
EM0EM0
1635
add a comment |
I have a systemd service that sets MemoryHigh and MemoryMax. If I look under its cgroup in /sys/fs/cgroup/memory the memory.limit_in_bytes file matches the limit set by MemoryMax, but where do I find the value set by MemoryHigh? There is a file named memory.soft_limit_in_bytes so I expected it to be that, but its value is always 9223372036854771712 (8 EB?).
The doc for MemoryHigh says
This controls the "memory.high" control group attribute
but there is no file with that name.
This is on Ubuntu 18.04.
systemd cgroups
edited Feb 5 at 16:09
Stephen Kitt
173k24397472
asked Feb 5 at 16:04
EM0EM0
1635
I have a systemd service that sets MemoryHigh and MemoryMax. If I look under its cgroup in /sys/fs/cgroup/memory the memory.limit_in_bytes file matches the limit set by MemoryMax, but where do I find the value set by MemoryHigh? There is a file named memory.soft_limit_in_bytes so I expected it to be that, but its value is always 9223372036854771712 (8 EB?).
The doc for MemoryHigh says
This controls the "memory.high" control group attribute
but there is no file with that name.
This is on Ubuntu 18.04.
systemd cgroups
systemd cgroups
edited Feb 5 at 16:09
Stephen Kitt
173k24397472
asked Feb 5 at 16:04
EM0EM0
1635
edited Feb 5 at 16:09
Stephen Kitt
173k24397472
asked Feb 5 at 16:04
EM0EM0
1635
edited Feb 5 at 16:09
Stephen Kitt
173k24397472
edited Feb 5 at 16:09
Stephen Kitt
173k24397472
edited Feb 5 at 16:09
Stephen Kitt
173k24397472
173k24397472
asked Feb 5 at 16:04
EM0EM0
1635
asked Feb 5 at 16:04
EM0EM0
1635
asked Feb 5 at 16:04
EM0EM0
1635
1635
add a comment |
add a comment |
1 Answer
1
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oldest
votes
The resource control documentation also mentions that
MemoryLow=andMemoryHigh=are effective only on unified hierarchy.
“Unified hierarchy” means cgroup v2 only; you’re using v1 or hybrid mode. To use unified hierarchy, if it’s not the default, the system should be booted with the systemd.unified_cgroup_hierarchy option.
answered Feb 5 at 16:07
Stephen KittStephen Kitt
173k24397472
Ah, that's a good point. It's actually in hybrid mode, so I have/sys/fs/cgroup/unified/MY_SLICE_NAMEas well, but there is nothing related to memory under there. Does this mean there is no way to see the MemoryHigh value in hybrid mode?
– EM0
Feb 5 at 16:50
It turns out that "unified hierarchy" means "only cgroups v2" - in hybrid mode MemoryHigh is silently ignored! So I had to set the systemd.unified_cgroup_hierarchy kernel boot option to get this to work.
– EM0
Feb 6 at 10:05
add a comment |
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1 Answer
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1 Answer
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active
oldest
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active
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votes
The resource control documentation also mentions that
MemoryLow=andMemoryHigh=are effective only on unified hierarchy.
“Unified hierarchy” means cgroup v2 only; you’re using v1 or hybrid mode. To use unified hierarchy, if it’s not the default, the system should be booted with the systemd.unified_cgroup_hierarchy option.
answered Feb 5 at 16:07
Stephen KittStephen Kitt
173k24397472
Ah, that's a good point. It's actually in hybrid mode, so I have/sys/fs/cgroup/unified/MY_SLICE_NAMEas well, but there is nothing related to memory under there. Does this mean there is no way to see the MemoryHigh value in hybrid mode?
– EM0
Feb 5 at 16:50
It turns out that "unified hierarchy" means "only cgroups v2" - in hybrid mode MemoryHigh is silently ignored! So I had to set the systemd.unified_cgroup_hierarchy kernel boot option to get this to work.
– EM0
Feb 6 at 10:05
add a comment |
The resource control documentation also mentions that
MemoryLow=andMemoryHigh=are effective only on unified hierarchy.
“Unified hierarchy” means cgroup v2 only; you’re using v1 or hybrid mode. To use unified hierarchy, if it’s not the default, the system should be booted with the systemd.unified_cgroup_hierarchy option.
answered Feb 5 at 16:07
Stephen KittStephen Kitt
173k24397472
Ah, that's a good point. It's actually in hybrid mode, so I have/sys/fs/cgroup/unified/MY_SLICE_NAMEas well, but there is nothing related to memory under there. Does this mean there is no way to see the MemoryHigh value in hybrid mode?
– EM0
Feb 5 at 16:50
It turns out that "unified hierarchy" means "only cgroups v2" - in hybrid mode MemoryHigh is silently ignored! So I had to set the systemd.unified_cgroup_hierarchy kernel boot option to get this to work.
– EM0
Feb 6 at 10:05
add a comment |
The resource control documentation also mentions that
MemoryLow=andMemoryHigh=are effective only on unified hierarchy.
“Unified hierarchy” means cgroup v2 only; you’re using v1 or hybrid mode. To use unified hierarchy, if it’s not the default, the system should be booted with the systemd.unified_cgroup_hierarchy option.
answered Feb 5 at 16:07
Stephen KittStephen Kitt
173k24397472
The resource control documentation also mentions that
MemoryLow=andMemoryHigh=are effective only on unified hierarchy.
“Unified hierarchy” means cgroup v2 only; you’re using v1 or hybrid mode. To use unified hierarchy, if it’s not the default, the system should be booted with the systemd.unified_cgroup_hierarchy option.
answered Feb 5 at 16:07
Stephen KittStephen Kitt
173k24397472
edited Feb 6 at 10:40
answered Feb 5 at 16:07
Stephen KittStephen Kitt
173k24397472
answered Feb 5 at 16:07
Stephen KittStephen Kitt
173k24397472
answered Feb 5 at 16:07
Stephen KittStephen Kitt
173k24397472
173k24397472
Ah, that's a good point. It's actually in hybrid mode, so I have/sys/fs/cgroup/unified/MY_SLICE_NAMEas well, but there is nothing related to memory under there. Does this mean there is no way to see the MemoryHigh value in hybrid mode?
– EM0
Feb 5 at 16:50
It turns out that "unified hierarchy" means "only cgroups v2" - in hybrid mode MemoryHigh is silently ignored! So I had to set the systemd.unified_cgroup_hierarchy kernel boot option to get this to work.
– EM0
Feb 6 at 10:05
add a comment |
Ah, that's a good point. It's actually in hybrid mode, so I have/sys/fs/cgroup/unified/MY_SLICE_NAMEas well, but there is nothing related to memory under there. Does this mean there is no way to see the MemoryHigh value in hybrid mode?
– EM0
Feb 5 at 16:50
It turns out that "unified hierarchy" means "only cgroups v2" - in hybrid mode MemoryHigh is silently ignored! So I had to set the systemd.unified_cgroup_hierarchy kernel boot option to get this to work.
– EM0
Feb 6 at 10:05
Ah, that's a good point. It's actually in hybrid mode, so I have
/sys/fs/cgroup/unified/MY_SLICE_NAME as well, but there is nothing related to memory under there. Does this mean there is no way to see the MemoryHigh value in hybrid mode?– EM0
Feb 5 at 16:50
Ah, that's a good point. It's actually in hybrid mode, so I have
/sys/fs/cgroup/unified/MY_SLICE_NAME as well, but there is nothing related to memory under there. Does this mean there is no way to see the MemoryHigh value in hybrid mode?– EM0
Feb 5 at 16:50
It turns out that "unified hierarchy" means "only cgroups v2" - in hybrid mode MemoryHigh is silently ignored! So I had to set the systemd.unified_cgroup_hierarchy kernel boot option to get this to work.
– EM0
Feb 6 at 10:05
It turns out that "unified hierarchy" means "only cgroups v2" - in hybrid mode MemoryHigh is silently ignored! So I had to set the systemd.unified_cgroup_hierarchy kernel boot option to get this to work.
– EM0
Feb 6 at 10:05
add a comment |
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