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Commit 8cfeb385 authored by Odin Ugedal's avatar Odin Ugedal Committed by Tejun Heo
Browse files

docs cgroups: add another example size for hugetlb 

Add another example to clarify that HugePages smaller than 1MB will
be displayed using "KB", with an uppercased K (eg. 20KB), and not the
normal SI prefix kilo (small k).

Because of a misunderstanding/copy-paste error inside runc
(see https://github.com/opencontainers/runc/pull/2065

), it tried
accessing the cgroup control file of a 64kB HugePage using
"hugetlb.64kB._____" instead of the correct "hugetlb.64KB._____".

Adding a new example will make it clear how sizes smaller than 1MB are
handled.

Signed-off-by: default avatarOdin Ugedal <odin@ugedal.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 18fa84a2

Documentation/cgroup-v1/hugetlb.txt

+13 −9
Original line number Diff line number Diff line
@@ -32,14 +32,18 @@ Brief summary of control files 
 hugetlb.<hugepagesize>.usage_in_bytes     # show current usage for "hugepagesize" hugetlb

 hugetlb.<hugepagesize>.failcnt		   # show the number of allocation failure due to HugeTLB limit



For a system supporting two hugepage size (16M and 16G) the control

For a system supporting three hugepage sizes (64k, 32M and 1G), the control

files include:



hugetlb.16GB.limit_in_bytes

hugetlb.16GB.max_usage_in_bytes

hugetlb.16GB.usage_in_bytes

hugetlb.16GB.failcnt

hugetlb.16MB.limit_in_bytes

hugetlb.16MB.max_usage_in_bytes

hugetlb.16MB.usage_in_bytes

hugetlb.16MB.failcnt
 
hugetlb.1GB.limit_in_bytes

hugetlb.1GB.max_usage_in_bytes

hugetlb.1GB.usage_in_bytes

hugetlb.1GB.failcnt

hugetlb.64KB.limit_in_bytes

hugetlb.64KB.max_usage_in_bytes

hugetlb.64KB.usage_in_bytes

hugetlb.64KB.failcnt

hugetlb.32MB.limit_in_bytes

hugetlb.32MB.max_usage_in_bytes

hugetlb.32MB.usage_in_bytes

hugetlb.32MB.failcnt