Fix cgroup hugetlb size prefix for kB #696
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The hugetlb cgroup control files (introduced here in 2012: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=abb8206cb0773) use "KB" and not "kB" (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/hugetlb_cgroup.c\?h\=v5.0\#n349\). The behavior in the kernel has not changed since the introduction, and the current code using "kB" will therefore fail on devices with small amounts of ram (see kubernetes/kubernetes#77169) running a kernel with config flag CONFIG_HUGETLBFS=y As seen from the code in "mem_fmt" inside hugetlb_cgroup.c, only "KB", "MB" and "GB" are used, so the others may be removed as well. Here is a real world example of the files inside the "/sys/kernel/mm/hugepages/" directory: - "hugepages-64kB" - "hugepages-2048kB" - "hugepages-32768kB" - "hugepages-1048576kB" And the corresponding cgroup files: - "hugetlb.64KB._____" - "hugetlb.2MB._____" - "hugetlb.32MB._____" - "hugetlb.1GB._____" Signed-off-by: Odin Ugedal <odin@ugedal.com>
Not all arches/setups supports all page sizes. Should only use the ones supported on the current platform Signed-off-by: Odin Ugedal <odin@ugedal.com>
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cc @vbatts |
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LGTM |
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ping @opencontainers/runtime-tools-maintainers |
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LGTM |
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This is ~a cherry-pick of opencontainers/runc#2065.
The hugetlb cgroup control files (introduced here in 2012:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=abb8206cb0773)
use "KB" and not "kB"
(https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/hugetlb_cgroup.c\?h\=v5.0\#n349\).
The behavior in the kernel has not changed since the introduction, and
the current code using "kB" will therefore fail on devices with small
amounts of ram (see
kubernetes/kubernetes#77169) running a kernel
with config flag CONFIG_HUGETLBFS=y
As seen from the code in "mem_fmt" inside hugetlb_cgroup.c, only "KB",
"MB" and "GB" are used, so the others may be removed as well.
Here is a real world example of the files inside the
"/sys/kernel/mm/hugepages/" directory:
And the corresponding cgroup files: