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cgroups: update documentation about css_set hash table

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The css_set hash table was introduced in 2.6.26, so update the
documentation accordingly.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Li Zefan 2009-02-18 14:48:14 -08:00 committed by Linus Torvalds
parent b6d6c51758
commit b851ee7921
1 changed files with 2 additions and 4 deletions
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6
Documentation/cgroups/cgroups.txt
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@ -252,10 +252,8 @@ cgroup file system directories.
When a task is moved from one cgroup to another, it gets a new
css_set pointer - if there's an already existing css_set with the
desired collection of cgroups then that group is reused, else a new
css_set is allocated. Note that the current implementation uses a
linear search to locate an appropriate existing css_set, so isn't
very efficient. A future version will use a hash table for better
performance.
css_set is allocated. The appropriate existing css_set is located by
looking into a hash table.
To allow access from a cgroup to the css_sets (and hence tasks)
that comprise it, a set of cg_cgroup_link objects form a lattice;