[BUG ?]: hugetlb.xxx[.rsvd].max implicit write failure

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attempted to use hugetlb resource control for the first time. running 6.1.9

create the subdirectory, then enable the hugetlb controller. reading the
initial value of hugetlb.2MB.rsvd.max returns "max". i write 128 and receive a
return value of 3. but then read hugetlb.2MB.rsvd.max and it now returns 0.
same exact thing happens for hugetlb.2MB.max

so clearly the write is secretly failing somewhere even though the write
operation return success?

there are plenty of pages available:

HugePages_Total:    4096
HugePages_Free:     4096
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:        13631488 kB

none of the scarce documentation on this controller leads me to believe there's
any required configuration beyond the above. so completely bewildered as to
what's going wrong?



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