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Task Control Groups: simple task cgroup debug info subsystem
This example subsystem exports debugging information as an aid to diagnosing refcount leaks, etc, in the cgroup framework. Signed-off-by: Paul Menage <menage@google.com> Cc: Serge E. Hallyn <serue@us.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Dave Hansen <haveblue@us.ibm.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Paul Jackson <pj@sgi.com> Cc: Kirill Korotaev <dev@openvz.org> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Srivatsa Vaddagiri <vatsa@in.ibm.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -19,4 +19,8 @@ SUBSYS(cpuacct)
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/* */
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#ifdef CONFIG_CGROUP_DEBUG
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SUBSYS(debug)
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#endif
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/* */
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10
init/Kconfig
10
init/Kconfig
@ -278,6 +278,16 @@ config CGROUPS
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Say N if unsure.
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config CGROUP_DEBUG
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bool "Example debug cgroup subsystem"
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depends on CGROUPS
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help
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This option enables a simple cgroup subsystem that
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exports useful debugging information about the cgroups
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framework
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Say N if unsure
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config CPUSETS
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bool "Cpuset support"
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depends on SMP && CGROUPS
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@ -37,6 +37,7 @@ obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
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obj-$(CONFIG_KEXEC) += kexec.o
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obj-$(CONFIG_COMPAT) += compat.o
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obj-$(CONFIG_CGROUPS) += cgroup.o
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obj-$(CONFIG_CGROUP_DEBUG) += cgroup_debug.o
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obj-$(CONFIG_CPUSETS) += cpuset.o
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obj-$(CONFIG_CGROUP_CPUACCT) += cpu_acct.o
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obj-$(CONFIG_IKCONFIG) += configs.o
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97
kernel/cgroup_debug.c
Normal file
97
kernel/cgroup_debug.c
Normal file
@ -0,0 +1,97 @@
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/*
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* kernel/ccontainer_debug.c - Example cgroup subsystem that
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* exposes debug info
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*
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* Copyright (C) Google Inc, 2007
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*
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* Developed by Paul Menage (menage@google.com)
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*
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*/
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#include <linux/cgroup.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/rcupdate.h>
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#include <asm/atomic.h>
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static struct cgroup_subsys_state *debug_create(struct cgroup_subsys *ss,
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struct cgroup *cont)
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{
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struct cgroup_subsys_state *css = kzalloc(sizeof(*css), GFP_KERNEL);
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if (!css)
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return ERR_PTR(-ENOMEM);
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return css;
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}
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static void debug_destroy(struct cgroup_subsys *ss, struct cgroup *cont)
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{
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kfree(cont->subsys[debug_subsys_id]);
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}
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static u64 cgroup_refcount_read(struct cgroup *cont, struct cftype *cft)
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{
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return atomic_read(&cont->count);
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}
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static u64 taskcount_read(struct cgroup *cont, struct cftype *cft)
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{
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u64 count;
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cgroup_lock();
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count = cgroup_task_count(cont);
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cgroup_unlock();
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return count;
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}
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static u64 current_css_set_read(struct cgroup *cont, struct cftype *cft)
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{
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return (u64)(long)current->cgroups;
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}
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static u64 current_css_set_refcount_read(struct cgroup *cont,
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struct cftype *cft)
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{
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u64 count;
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rcu_read_lock();
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count = atomic_read(¤t->cgroups->ref.refcount);
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rcu_read_unlock();
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return count;
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}
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static struct cftype files[] = {
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{
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.name = "cgroup_refcount",
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.read_uint = cgroup_refcount_read,
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},
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{
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.name = "taskcount",
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.read_uint = taskcount_read,
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},
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{
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.name = "current_css_set",
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.read_uint = current_css_set_read,
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},
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{
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.name = "current_css_set_refcount",
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.read_uint = current_css_set_refcount_read,
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},
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};
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static int debug_populate(struct cgroup_subsys *ss, struct cgroup *cont)
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{
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return cgroup_add_files(cont, ss, files, ARRAY_SIZE(files));
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}
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struct cgroup_subsys debug_subsys = {
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.name = "debug",
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.create = debug_create,
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.destroy = debug_destroy,
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.populate = debug_populate,
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.subsys_id = debug_subsys_id,
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};
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