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cgroups: update documentation about css_set hash table
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>
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@ -252,10 +252,8 @@ cgroup file system directories.
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When a task is moved from one cgroup to another, it gets a new
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css_set pointer - if there's an already existing css_set with the
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desired collection of cgroups then that group is reused, else a new
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css_set is allocated. Note that the current implementation uses a
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linear search to locate an appropriate existing css_set, so isn't
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very efficient. A future version will use a hash table for better
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performance.
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css_set is allocated. The appropriate existing css_set is located by
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looking into a hash table.
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To allow access from a cgroup to the css_sets (and hence tasks)
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that comprise it, a set of cg_cgroup_link objects form a lattice;
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