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author | James Morris <jmorris@namei.org> | 2008-12-25 00:40:09 (GMT) |
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committer | James Morris <jmorris@namei.org> | 2008-12-25 00:40:09 (GMT) |
commit | cbacc2c7f066a1e01b33b0e27ae5efbf534bc2db (patch) | |
tree | 90d1093131d2a3543a8b3b1f3364e7c6f4081a93 /Documentation/scheduler | |
parent | 4a6908a3a050aacc9c3a2f36b276b46c0629ad91 (diff) | |
parent | 74192246910ff4fb95309ba1a683215644beeb62 (diff) | |
download | linux-fsl-qoriq-cbacc2c7f066a1e01b33b0e27ae5efbf534bc2db.tar.xz |
Merge branch 'next' into for-linus
Diffstat (limited to 'Documentation/scheduler')
-rw-r--r-- | Documentation/scheduler/sched-design-CFS.txt | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/scheduler/sched-design-CFS.txt b/Documentation/scheduler/sched-design-CFS.txt index eb471c7..8398ca4 100644 --- a/Documentation/scheduler/sched-design-CFS.txt +++ b/Documentation/scheduler/sched-design-CFS.txt @@ -273,3 +273,24 @@ task groups and modify their CPU share using the "cgroups" pseudo filesystem. # #Launch gmplayer (or your favourite movie player) # echo <movie_player_pid> > multimedia/tasks + +8. Implementation note: user namespaces + +User namespaces are intended to be hierarchical. But they are currently +only partially implemented. Each of those has ramifications for CFS. + +First, since user namespaces are hierarchical, the /sys/kernel/uids +presentation is inadequate. Eventually we will likely want to use sysfs +tagging to provide private views of /sys/kernel/uids within each user +namespace. + +Second, the hierarchical nature is intended to support completely +unprivileged use of user namespaces. So if using user groups, then +we want the users in a user namespace to be children of the user +who created it. + +That is currently unimplemented. So instead, every user in a new +user namespace will receive 1024 shares just like any user in the +initial user namespace. Note that at the moment creation of a new +user namespace requires each of CAP_SYS_ADMIN, CAP_SETUID, and +CAP_SETGID. |