cgroup: use bitmask to filter for_each_subsys

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Add a new macro for_each_subsys_which that allows all enabled cgroup
subsystems to be filtered by a bitmask, such that mask & (1 << ssid)
determines if the subsystem is to be processed in the loop body (where
ssid is the unique id of the subsystem).

Also replace the need_forkexit_callback with two separate bitmasks for
each callback to make (ss->{fork,exit}) checks unnecessary.

tj: add a short comment for "if (!CGROUP_SUBSYS_COUNT)".

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

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Aleksa Sarai 2015-06-06 10:02:14 +10:00 • committed by Tejun Heo

parent c80ef9e0c0

commit cb4a316752

2 changed files with 35 additions and 20 deletions

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2

include/linux/cgroup-defs.h

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53

kernel/cgroup.c

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