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author | James Morris <jmorris@namei.org> | 2008-12-24 19:40:09 -0500 |
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committer | James Morris <jmorris@namei.org> | 2008-12-24 19:40:09 -0500 |
commit | cbacc2c7f066a1e01b33b0e27ae5efbf534bc2db (patch) | |
tree | 90d1093131d2a3543a8b3b1f3364e7c6f4081a93 /Documentation/scheduler/sched-design-CFS.txt | |
parent | 4a6908a3a050aacc9c3a2f36b276b46c0629ad91 (diff) | |
parent | 74192246910ff4fb95309ba1a683215644beeb62 (diff) |
Merge branch 'next' into for-linus
Diffstat (limited to 'Documentation/scheduler/sched-design-CFS.txt')
-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 eb471c7a905e..8398ca4ff4ed 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. | |||
273 | 273 | ||
274 | # #Launch gmplayer (or your favourite movie player) | 274 | # #Launch gmplayer (or your favourite movie player) |
275 | # echo <movie_player_pid> > multimedia/tasks | 275 | # echo <movie_player_pid> > multimedia/tasks |
276 | |||
277 | 8. Implementation note: user namespaces | ||
278 | |||
279 | User namespaces are intended to be hierarchical. But they are currently | ||
280 | only partially implemented. Each of those has ramifications for CFS. | ||
281 | |||
282 | First, since user namespaces are hierarchical, the /sys/kernel/uids | ||
283 | presentation is inadequate. Eventually we will likely want to use sysfs | ||
284 | tagging to provide private views of /sys/kernel/uids within each user | ||
285 | namespace. | ||
286 | |||
287 | Second, the hierarchical nature is intended to support completely | ||
288 | unprivileged use of user namespaces. So if using user groups, then | ||
289 | we want the users in a user namespace to be children of the user | ||
290 | who created it. | ||
291 | |||
292 | That is currently unimplemented. So instead, every user in a new | ||
293 | user namespace will receive 1024 shares just like any user in the | ||
294 | initial user namespace. Note that at the moment creation of a new | ||
295 | user namespace requires each of CAP_SYS_ADMIN, CAP_SETUID, and | ||
296 | CAP_SETGID. | ||