container freezer: prevent frozen tasks or cgroups from changing

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Don't let frozen tasks or cgroups change.  This means frozen tasks can't
leave their current cgroup for another cgroup.  It also means that tasks
cannot be added to or removed from a cgroup in the FROZEN state.  We
enforce these rules by checking for frozen tasks and cgroups in the
can_attach() function.

Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Matt Helsley 2008-10-18 20:27:22 -07:00 • committed by Linus Torvalds

parent 5a06915c6d

commit 957a4eeaf4

1 changed files with 26 additions and 17 deletions

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kernel/cgroup_freezer.c

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