linux-kernel - Re: [PATCH 4/7] bio-cgroup: Split the cgroup memory subsystem into two parts

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Message-Id: <20080805.193551.14286210.taka@valinux.co.jp>
Date:	Tue, 05 Aug 2008 19:35:51 +0900 (JST)
From:	Hirokazu Takahashi <taka@...inux.co.jp>
To:	righi.andrea@...il.com
Cc:	ryov@...inux.co.jp, xen-devel@...ts.xensource.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, dm-devel@...hat.com,
	agk@...rceware.org
Subject: Re: [PATCH 4/7] bio-cgroup: Split the cgroup memory subsystem into
 two parts

Hi, Andrea,

> you can remove some ifdefs doing:

I think you don't have to care about this much, since one of the following
patches removes most of these ifdefs.

> #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 */
> _______________________________________________
> Containers mailing list
> Containers@...ts.linux-foundation.org
> https://lists.linux-foundation.org/mailman/listinfo/containers
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