Eric Lee / smarc-fsl-linux-kernel

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kernel/cgroup_debug.c 2.04 KB
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  /*
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   * kernel/cgroup_debug.c - Example cgroup subsystem that
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   * exposes debug info
   *
   * Copyright (C) Google Inc, 2007
   *
   * Developed by Paul Menage (menage@google.com)
   *
   */
  
  #include <linux/cgroup.h>
  #include <linux/fs.h>
  #include <linux/slab.h>
  #include <linux/rcupdate.h>
  
  #include <asm/atomic.h>
  
  static struct cgroup_subsys_state *debug_create(struct cgroup_subsys *ss,
  						   struct cgroup *cont)
  {
  	struct cgroup_subsys_state *css = kzalloc(sizeof(*css), GFP_KERNEL);
  
  	if (!css)
  		return ERR_PTR(-ENOMEM);
  
  	return css;
  }
  
  static void debug_destroy(struct cgroup_subsys *ss, struct cgroup *cont)
  {
  	kfree(cont->subsys[debug_subsys_id]);
  }
  
  static u64 cgroup_refcount_read(struct cgroup *cont, struct cftype *cft)
  {
  	return atomic_read(&cont->count);
  }
  
  static u64 taskcount_read(struct cgroup *cont, struct cftype *cft)
  {
  	u64 count;
  
  	cgroup_lock();
  	count = cgroup_task_count(cont);
  	cgroup_unlock();
  	return count;
  }
  
  static u64 current_css_set_read(struct cgroup *cont, struct cftype *cft)
  {
  	return (u64)(long)current->cgroups;
  }
  
  static u64 current_css_set_refcount_read(struct cgroup *cont,
  					   struct cftype *cft)
  {
  	u64 count;
  
  	rcu_read_lock();
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  	count = atomic_read(&current->cgroups->refcount);
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  	rcu_read_unlock();
  	return count;
  }
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  static u64 releasable_read(struct cgroup *cgrp, struct cftype *cft)
  {
  	return test_bit(CGRP_RELEASABLE, &cgrp->flags);
  }
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  static struct cftype files[] =  {
  	{
  		.name = "cgroup_refcount",
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  		.read_u64 = cgroup_refcount_read,
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  	},
  	{
  		.name = "taskcount",
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  		.read_u64 = taskcount_read,
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  	},
  
  	{
  		.name = "current_css_set",
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  		.read_u64 = current_css_set_read,
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  	},
  
  	{
  		.name = "current_css_set_refcount",
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  		.read_u64 = current_css_set_refcount_read,
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  	},
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  	{
  		.name = "releasable",
  		.read_u64 = releasable_read,
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  	},
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  };
  
  static int debug_populate(struct cgroup_subsys *ss, struct cgroup *cont)
  {
  	return cgroup_add_files(cont, ss, files, ARRAY_SIZE(files));
  }
  
  struct cgroup_subsys debug_subsys = {
  	.name = "debug",
  	.create = debug_create,
  	.destroy = debug_destroy,
  	.populate = debug_populate,
  	.subsys_id = debug_subsys_id,
  };