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cgroups: fix get attributes for controller noprefix mounted

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CGroups controller can be mounted by specifying a "noprefix" option,
in which case attribute names are named as:
   <mountpoint>/<attribute_name>
instead of the (more recent) naming schema using:
   <mountpoint>/<contoller_name>.<attribute_name>

For example, Android uses the old format for backward compatibility
with user-space. Thus, it's possible in general to work on a target
system where some controller are mounted "noprefix" while others not.

This patchset adds a set of updates which allows to use the proper
attributes naming schema based on how the controller has been mounted.

This patch provides a more generic implementation of the get attributes
shutils which is working also for noprefix mounted controllers.

Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
This commit is contained in:
Patrick Bellasi 2016-04-26 15:28:16 +01:00
parent 658005a178
commit c976189444
1 changed files with 18 additions and 4 deletions
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16
devlib/bin/scripts/shutils.in
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@ -62,12 +62,26 @@ ftrace_get_function_stats() {
################################################################################
cgroups_get_attributes() {
[[ $# -eq 2 ]] || exit -1
test $# -eq 2 || exit -1
CGROUP="$1"
CONTROLLER="$2"
# Check if controller is mounted with "noprefix" option, which is quite
# common on Android for backward compatibility
ls $CGROUP/$CONTROLLER\.* 2>&1 >/dev/null
if [ $? -eq 0 ]; then
# no "noprefix" option, attributes format is:
# mnt_point/controller.attribute_name
$GREP '' $CGROUP/* | \
$GREP "$CONTROLLER\." | \
$SED -e "s|$CONTROLLER\.||" -e "s|$CGROUP/||"
else
# "noprefix" option, attribute format is:
# mnt_point/attribute_name
$GREP '' $(\
$FIND $CGROUP -type f -maxdepth 1 |
$GREP -v -e ".*tasks" -e ".*cgroup\..*") | \
$SED "s|$CGROUP/||"
fi
}
cgroups_run_into() {