函数源码

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source File:mm\hugetlb_cgroup.c Create Date:2022-07-27 17:50:51
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int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
                 struct hugetlb_cgroup **ptr)
{
    int ret = 0;
    struct page_counter *counter;
    struct hugetlb_cgroup *h_cg = NULL;
 
    if (hugetlb_cgroup_disabled())
        goto done;
    /*
     * We don't charge any cgroup if the compound page have less
     * than 3 pages.
     */
    if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER)
        goto done;
again:
    rcu_read_lock();
    h_cg = hugetlb_cgroup_from_task(current);
    if (!css_tryget(&h_cg->css)) {
        rcu_read_unlock();
        goto again;
    }
    rcu_read_unlock();
 
    if (!page_counter_try_charge(&h_cg->hugepage[idx], nr_pages, &counter))
        ret = -ENOMEM;
    css_put(&h_cg->css);
done:
    *ptr = h_cg;
    return ret;
}