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[/] [or1k_soc_on_altera_embedded_dev_kit/] [tags/] [linux-2.6/] [linux-2.6.24_orig/] [kernel/] [cgroup_debug.c] - Blame information for rev 8

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Line No. Rev Author Line
1 3 xianfeng 
/*
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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(&current->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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