linux-kernel - Re: [PATCH -v3 3/4] lib, Make gen

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Message-ID: <20110413210757.GA11683@Krystal>
Date:	Wed, 13 Apr 2011 17:07:57 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>,
	Tony Luck <tony.luck@...el.com>, linux-acpi@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH -v3 3/4] lib, Make gen_pool memory allocator lockless

* Huang Ying (ying.huang@...el.com) wrote:
[...]
> + * rcu_read_lock and rcu_read_unlock is not used int gen_pool_alloc,
> + * gen_pool_free, gen_pool_avail and gen_pool_size etc, because chunks
> + * are only added into pool, not deleted from pool unless the pool
> + * itself is destroyed.  If chunk will be deleted from pool,
> + * rcu_read_lock and rcu_read_unlock should be uses in these
> + * functions.

So how do you protect between pool destruction and adding chunks into
the pool ?

Thanks,

Mathieu

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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