Add support for rsvd hugetlb cgroup #2719

omprakaash · 2024-03-04T04:25:17Z

Adds support for rsvg hugetlb cgroup. More Info on why this is necessary: opencontainers/runtime-spec#1116. Should fix #1707.

omprakaash · 2024-03-05T18:23:26Z

I can also open up a PR in oci-spec-rs if necessary to update info about huge-tlb limits.

utam0k · 2024-03-06T12:20:10Z

I can also open up a PR in oci-spec-rs if necessary to update info about huge-tlb limits.

Let's do it.

omprakaash · 2024-03-09T19:54:14Z

Hey, sorry for the delay. Opened up a corresponding PR in oci-spec-rs repo as well.

utam0k · 2024-03-13T12:05:38Z

@omprakaash May I ask you to add a e2e test?
https://containers.github.io/youki/developer/e2e/rust_oci_test.html

omprakaash · 2024-03-13T13:53:55Z

Oh yes ! Will add one.

YJDoc2 · 2024-03-18T06:20:38Z

Hey, do we need a oci-spec release and update its version in this PR ?

utam0k · 2024-04-01T00:01:44Z

@omprakaash friendly remind ;)

utam0k · 2024-04-01T00:02:00Z

Hey, do we need a oci-spec release and update its version in this PR ?

If needed, I can do it.

codecov-commenter · 2024-04-01T06:13:44Z

Codecov Report

Merging #2719 (4e2a9cb) into main (ed2c08d) will increase coverage by 0.25%.
Report is 27 commits behind head on main.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2719      +/-   ##
==========================================
+ Coverage   65.21%   65.47%   +0.25%     
==========================================
  Files         133      133              
  Lines       16981    17099     +118     
==========================================
+ Hits        11074    11195     +121     
+ Misses       5907     5904       -3

utam0k · 2024-04-01T06:42:20Z

tests/contest/contest/src/tests/tlb/tlb_test.rs

crates/libcgroups/src/v1/hugetlb.rs

utam0k · 2024-04-01T06:56:01Z

crates/libcgroups/src/v1/hugetlb.rs

+        let _ = common::write_cgroup_file(
+            root_path.join(format!(
+                "hugetlb.{}.rsvd.limit_in_bytes",
+                hugetlb.page_size()
+            )),
+            hugetlb.limit(),
+        );
+


Please take care of Result type.

Suggested change

let _ = common::write_cgroup_file(

root_path.join(format!(

"hugetlb.{}.rsvd.limit_in_bytes",

hugetlb.page_size()

)),

hugetlb.limit(),

);

common::write_cgroup_file(

root_path.join(format!(

"hugetlb.{}.rsvd.limit_in_bytes",

hugetlb.page_size()

)),

hugetlb.limit(),

)?;

Oh, I ignored the result because the desired behavior was falling back to just writing to the non-rsvd file if the rsvd file was not present.

utam0k · 2024-04-01T07:09:35Z

crates/libcgroups/src/v1/hugetlb.rs

-
-        let usage_file = format!("hugetlb.{page_size}.usage_in_bytes");
-        let usage_content = common::read_cgroup_file(cgroup_path.join(usage_file))?;
+        let mut rsvd = ".rsvd";


How about this?

Suggested change

let mut rsvd = ".rsvd";

let mut file_prefix= format!("hugetlb.{page_size}.rsvd");

Oh that is better, will change it.

utam0k · 2024-04-01T07:10:31Z

crates/libcgroups/src/v2/hugetlb.rs

+        let _ = common::write_cgroup_file(
+            root_path.join(format!("hugetlb.{}.rsvd.max", hugetlb.page_size())),
+            hugetlb.limit(),
+        );
+


Suggested change

let _ = common::write_cgroup_file(

root_path.join(format!("hugetlb.{}.rsvd.max", hugetlb.page_size())),

hugetlb.limit(),

);

common::write_cgroup_file(

root_path.join(format!("hugetlb.{}.rsvd.max", hugetlb.page_size())),

hugetlb.limit(),

)?;

utam0k · 2024-04-01T07:11:32Z

crates/libcgroups/src/v2/hugetlb.rs

-        let events_file = format!("hugetlb.{page_size}.events");
-        let path = cgroup_path.join(events_file);
-        let events = common::read_cgroup_file(&path)?;
+        let mut rsvd = ".rsvd";


Same as comment in cgroup v1.

utam0k · 2024-04-02T12:02:32Z

@omprakaash It looks like the unit test failed. Please check it
https://github.com/containers/youki/actions/runs/8515994057/job/23342405969?pr=2719

omprakaash · 2024-04-03T02:03:43Z

Oh that is because the functions fails if the write to the new rsvd file fails. If rsvd is not supported, I think we should fallback to just writing to the non-rsvd file (https://github.com/opencontainers/runtime-spec/pull/1116/files). I left a follow up comment in the code review - review

utam0k · 2024-04-03T12:44:30Z

Oh that is because the functions fails if the write to the new rsvd file fails. If rsvd is not supported, I think we should fallback to just writing to the non-rsvd file (https://github.com/opencontainers/runtime-spec/pull/1116/files). I left a follow up comment in the code review - review

These unit tests use temporary dirs(/tmp). It means we don't use actual cgroup fs. You can put any file to simulate support rsvd in a temporary dir.

omprakaash · 2024-04-04T03:34:56Z

Hey, sorry I might be misunderstanding, but that is what the newly added tests do (eg: test_set_rsvd_hugetlb() ). So this test is testing that the application of hugetlb stats does not error out if rsvd-hugetlb file is not present.

utam0k · 2024-04-04T11:50:22Z

@omprakaash
Oh, I was wrong. I understood.

But there are possibilities of errors except for what you expect when writing the cgroup file, so we can't ignore this result.

Oh, I ignored the result because the desired behavior was falling back to just writing to the non-rsvd file if the rsvd file was not present.

How about checking if the rvsd is supported before writing rvsd's cgroup file?
https://github.com/omprakaash/youki/blob/f2bf35c0b4244bf4d1a73e56c85de3c7b3b11def/crates/libcgroups/src/v2/hugetlb.rs#L109-L112

omprakaash · 2024-04-07T04:09:11Z

Gotcha, changed it so that we first check if the rsvd file exists before attempting to write into it.

Signed-off-by: omprakaash <[email protected]> Signed-off-by: om <[email protected]> Signed-off-by: Om Prakaash <[email protected]>

utam0k

LGTM 👍 Thanks, @omprakaash

YJDoc2 added the kind/feature label Mar 11, 2024

omprakaash force-pushed the rsvd-hugetlb branch 2 times, most recently from 274287d to 4e2a9cb Compare April 1, 2024 00:46

utam0k reviewed Apr 1, 2024

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tests/contest/contest/src/tests/tlb/tlb_test.rs Outdated

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utam0k requested changes Apr 1, 2024

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omprakaash force-pushed the rsvd-hugetlb branch from 4e2a9cb to f2bf35c Compare April 2, 2024 01:19

omprakaash force-pushed the rsvd-hugetlb branch from f2bf35c to 45929ed Compare April 7, 2024 04:08

Add support for rsvd hugetlb cgroup

f70f43d

Signed-off-by: omprakaash <[email protected]> Signed-off-by: om <[email protected]> Signed-off-by: Om Prakaash <[email protected]>

omprakaash force-pushed the rsvd-hugetlb branch from 45929ed to f70f43d Compare April 7, 2024 04:10

utam0k approved these changes Apr 7, 2024

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utam0k enabled auto-merge (squash) April 7, 2024 05:26

utam0k merged commit e94e103 into youki-dev:main Apr 7, 2024
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Add support for rsvd hugetlb cgroup #2719

Add support for rsvd hugetlb cgroup #2719

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	let mut rsvd = ".rsvd";
	let mut file_prefix= format!("hugetlb.{page_size}.rsvd");

Add support for rsvd hugetlb cgroup #2719

Add support for rsvd hugetlb cgroup #2719

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