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Diffstat (limited to 'Documentation/cgroup-v1/hugetlb.txt')
| -rw-r--r-- | Documentation/cgroup-v1/hugetlb.txt | 49 |
1 files changed, 0 insertions, 49 deletions
diff --git a/Documentation/cgroup-v1/hugetlb.txt b/Documentation/cgroup-v1/hugetlb.txt deleted file mode 100644 index 1260e5369b9b..000000000000 --- a/Documentation/cgroup-v1/hugetlb.txt +++ /dev/null @@ -1,49 +0,0 @@ -HugeTLB Controller -------------------- - -The HugeTLB controller allows to limit the HugeTLB usage per control group and -enforces the controller limit during page fault. Since HugeTLB doesn't -support page reclaim, enforcing the limit at page fault time implies that, -the application will get SIGBUS signal if it tries to access HugeTLB pages -beyond its limit. This requires the application to know beforehand how much -HugeTLB pages it would require for its use. - -HugeTLB controller can be created by first mounting the cgroup filesystem. - -# mount -t cgroup -o hugetlb none /sys/fs/cgroup - -With the above step, the initial or the parent HugeTLB group becomes -visible at /sys/fs/cgroup. At bootup, this group includes all the tasks in -the system. /sys/fs/cgroup/tasks lists the tasks in this cgroup. - -New groups can be created under the parent group /sys/fs/cgroup. - -# cd /sys/fs/cgroup -# mkdir g1 -# echo $$ > g1/tasks - -The above steps create a new group g1 and move the current shell -process (bash) into it. - -Brief summary of control files - - hugetlb.<hugepagesize>.limit_in_bytes # set/show limit of "hugepagesize" hugetlb usage - hugetlb.<hugepagesize>.max_usage_in_bytes # show max "hugepagesize" hugetlb usage recorded - 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 three hugepage sizes (64k, 32M and 1G), the control -files include: - -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 |