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| author |   Tejun Heo <tj@kernel.org> | 2015-11-16 11:13:34 -0500 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2015-11-16 11:13:34 -0500 |
| commit | 0d942766453f3d23a51e0a2d430340a178b0903e (patch) | |
| tree | 9e26892b1c5797bb2001b121efbd6df5c695a7e6 /Documentation/cgroups/hugetlb.txt | |
| parent | cgroup: replace __DEVEL__sane_behavior with cgroup2 fs type (diff) | |
| download | linux-dev-0d942766453f3d23a51e0a2d430340a178b0903e.tar.xz linux-dev-0d942766453f3d23a51e0a2d430340a178b0903e.zip | |
cgroup: rename Documentation/cgroups/ to Documentation/cgroup-legacy/
In preparation for adding cgroup2 documentation, rename
Documentation/cgroups/ to Documentation/cgroup-legacy/.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'Documentation/cgroups/hugetlb.txt')
| -rw-r--r-- | Documentation/cgroups/hugetlb.txt | 45 |
1 files changed, 0 insertions, 45 deletions
diff --git a/Documentation/cgroups/hugetlb.txt b/Documentation/cgroups/hugetlb.txt deleted file mode 100644 index 106245c3aecc..000000000000 --- a/Documentation/cgroups/hugetlb.txt +++ /dev/null @@ -1,45 +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 two hugepage size (16M and 16G) 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 |