Ryo Tsuruta wrote:
> +static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
> + gfp_t gfp_mask, enum charge_type ctype,
> + struct mem_cgroup *memcg)
> +{
> + struct page_cgroup *pc;
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR
> + struct mem_cgroup *mem;
> + unsigned long flags;
> + unsigned long nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
> + struct mem_cgroup_per_zone *mz;
> +#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
> +
> + pc = kmem_cache_alloc(page_cgroup_cache, gfp_mask);
> + if (unlikely(pc == NULL))
> + goto err;
> +
> + /*
> + * We always charge the cgroup the mm_struct belongs to.
> + * The mm_struct's mem_cgroup changes on task migration if the
> + * thread group leader migrates. It's possible that mm is not
> + * set, if so charge the init_mm (happens for pagecache usage).
> + */
> + if (likely(!memcg)) {
> + rcu_read_lock();
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR
> + mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
> + /*
> + * For every charge from the cgroup, increment reference count
> + */
> + css_get(&mem->css);
> +#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
> + rcu_read_unlock();
> + } else {
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR
> + mem = memcg;
> + css_get(&memcg->css);
> +#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
> + }
> +
> +#ifdef CONFIG_CGROUP_MEM_RES_CTLR
> + while (res_counter_charge(&mem->res, PAGE_SIZE)) {
> + if (!(gfp_mask & __GFP_WAIT))
> + goto out;
> +
> + if (try_to_free_mem_cgroup_pages(mem, gfp_mask))
> + continue;
> +
> + /*
> + * try_to_free_mem_cgroup_pages() might not give us a full
> + * picture of reclaim. Some pages are reclaimed and might be
> + * moved to swap cache or just unmapped from the cgroup.
> + * Check the limit again to see if the reclaim reduced the
> + * current usage of the cgroup before giving up
> + */
> + if (res_counter_check_under_limit(&mem->res))
> + continue;
> +
> + if (!nr_retries--) {
> + mem_cgroup_out_of_memory(mem, gfp_mask);
> + goto out;
> + }
> + }
> + pc->mem_cgroup = mem;
> +#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
you can remove some ifdefs doing:
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
if (likely(!memcg)) {
rcu_read_lock();
mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
/*
* For every charge from the cgroup, increment reference count
*/
css_get(&mem->css);
rcu_read_unlock();
} else {
mem = memcg;
css_get(&memcg->css);
}
while (res_counter_charge(&mem->res, PAGE_SIZE)) {
if (!(gfp_mask & __GFP_WAIT))
goto out;
if (try_to_free_mem_cgroup_pages(mem, gfp_mask))
continue;
/*
* try_to_free_mem_cgroup_pages() might not give us a full
* picture of reclaim. Some pages are reclaimed and might be
* moved to swap cache or just unmapped from the cgroup.
* Check the limit again to see if the reclaim reduced the
* current usage of the cgroup before giving up
*/
if (res_counter_check_under_limit(&mem->res))
continue;
if (!nr_retries--) {
mem_cgroup_out_of_memory(mem, gfp_mask);
goto out;
}
}
pc->mem_cgroup = mem;
#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
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