From: Gavin Shan <shangw@linux.vnet.ibm.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: Gavin Shan <shangw@linux.vnet.ibm.com>,
linux-mm@kvack.org, rientjes@google.com, hannes@cmpxchg.org,
akpm@linux-foundation.org
Subject: Re: [PATCH 3/5] mm/sparse: fix possible memory leak
Date: Tue, 26 Jun 2012 15:17:21 +0800 [thread overview]
Message-ID: <20120626071721.GA23641@shangw> (raw)
In-Reply-To: <20120626071436.GB6713@tiehlicka.suse.cz>
>> >> With CONFIG_SPARSEMEM_EXTREME, the root memory section descriptors
>> >> are allocated by slab or bootmem allocator. Also, the descriptors
>> >> might have been allocated and initialized by others. However, the
>> >> memory chunk allocated in current implementation wouldn't be put
>> >> into the available pool if others have allocated memory chunk for
>> >> that.
>> >
>> >Who is others? I assume that we can race in hotplug because other than
>> >that this is an early initialization code. How can others race?
>> >
>>
>> I'm sorry that I don't have the real bug against the issue.
>
>I am not saying the bug is not real. It is just that the changelog
>doesn's say how the bug is hit, who is affected and when it has been
>introduced. These is essential for stable.
>
Thanks, Michal. Let me replace "others" with "hotplug" in next revision :-)
Thanks,
Gavin
>
>--
>Michal Hocko
>SUSE Labs
>SUSE LINUX s.r.o.
>Lihovarska 1060/12
>190 00 Praha 9
>Czech Republic
>
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next prev parent reply other threads:[~2012-06-26 7:17 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-23 15:52 [PATCH 1/5] mm/sparse: check size of struct mm_section Gavin Shan
2012-06-23 15:52 ` [PATCH 2/5] mm/sparse: optimize sparse_index_alloc Gavin Shan
2012-06-25 15:30 ` Michal Hocko
2012-06-26 6:07 ` Gavin Shan
2012-06-26 7:04 ` Michal Hocko
2012-06-26 7:13 ` Gavin Shan
2012-06-23 15:52 ` [PATCH 3/5] mm/sparse: fix possible memory leak Gavin Shan
2012-06-25 15:48 ` Michal Hocko
2012-06-26 6:11 ` Gavin Shan
2012-06-26 7:14 ` Michal Hocko
2012-06-26 7:17 ` Gavin Shan [this message]
2012-06-23 15:52 ` [PATCH 4/5] mm/sparse: more check on mem_section number Gavin Shan
2012-06-26 16:15 ` Dave Hansen
2012-06-27 0:29 ` Gavin Shan
2012-06-23 15:52 ` [PATCH 5/5] mm/sparse: return 0 if root mem_section exists Gavin Shan
2012-06-24 19:18 ` KOSAKI Motohiro
2012-06-25 1:09 ` Gavin Shan
2012-06-25 15:39 ` Michal Hocko
2012-06-25 16:03 ` [PATCH 1/5] mm/sparse: check size of struct mm_section Michal Hocko
2012-06-25 16:35 ` Gavin Shan
2012-06-26 7:39 ` Michal Hocko
2012-06-26 7:48 ` Gavin Shan
2012-06-26 8:06 ` Michal Hocko
2012-06-26 8:24 ` Gavin Shan
2012-06-26 17:57 ` Michal Hocko
2012-06-27 3:01 ` Gavin Shan
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