linux-kernel - Re: [PATCH 4/4] add ksm kernel shared memory driver.

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Message-ID: <49D9E054.8090502@redhat.com>
Date:	Mon, 06 Apr 2009 13:58:28 +0300
From:	Izik Eidus <ieidus@...hat.com>
To:	Izik Eidus <ieidus@...hat.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	linux-mm@...ck.org, avi@...hat.com, aarcange@...hat.com,
	chrisw@...hat.com, mtosatti@...hat.com, hugh@...itas.com,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 4/4] add ksm kernel shared memory driver.

Andrey Panin wrote:
> On 094, 04 04, 2009 at 05:35:22PM +0300, Izik Eidus wrote:
>
> <SNIP>
>
>   
>> +static inline u32 calc_checksum(struct page *page)
>> +{
>> +	u32 checksum;
>> +	void *addr = kmap_atomic(page, KM_USER0);
>> +	checksum = jhash(addr, PAGE_SIZE, 17);
>>     
>
> Why jhash2() is not used here ? It's faster and leads to smaller code size.
>   

Beacuse i didnt know, i will check that and change.

Thanks.

(We should really use in cpu crc for Intel Nehalem, and dirty bit for 
the rest of the architactures...)

>   
>> +	kunmap_atomic(addr, KM_USER0);
>> +	return checksum;
>> +}
>>     
>
>   

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