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Date: Wed, 24 Oct 2012 19:59:19 +0800
From: Ni zhan Chen <nizhan.chen@gmail.com>
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Subject: Re: ksm questions
References: <5087CED1.2030307@gmail.com> <5087D50D.8000101@ravellosystems.com>
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To: Izik Eidus <izik.eidus@ravellosystems.com>
Cc: Linux Memory Management List <linux-mm@kvack.org>, Andrea Arcangeli <aarcange@redhat.com>, Petr Holasek <pholasek@redhat.com>, Hugh Dickins <hughd@google.com>, Chris Wright <chrisw@sous-sol.org>, Rik van Riel <riel@redhat.com>

On 10/24/2012 07:46 PM, Izik Eidus wrote:
> On 10/24/2012 01:19 PM, Ni zhan Chen wrote:
>> Hi all,
>>
>> I have some questions about ksm.
>>
>> 1) khugepaged default nice value is 19, but ksmd default nice value 
>> is 5, why this big different?
>> 2) why ksm doesn't support pagecache and tmpfs now? What's the 
>> bottleneck?
>> 3) ksm kernel doc said that "KSM only merges anonymous(private) 
>> pages, never pagecache(file) pages". But where judege it should be 
>> private?
>> 4) ksm kernel doc said that "To avoid the instability and the 
>> resulting false negatives to be permanent, KSM re-initializes the 
>> unstable tree root node to an empty tree, at every KSM pass." But I 
>> can't find where re-initializes the unstable tree, could you explain me?
>
>
> in scan_get_next_rmap_item(), if (slot == &ksm_mm_head) then we do 
> root_unstable_tree = RB_ROOT; this will result in root_unstable_tree 
> being empty.

thanks Izik, what about the other three questions?

>
>>
>> Thanks in advance. :-)
>>
>> Regards,
>> Chen
>>
>
>

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