linux-kernel - Re: [Patch 4/8] ia64: implement crashkernel=auto

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Date:	Thu, 27 Aug 2009 18:26:02 +0800
From:	Amerigo Wang <amwang@...hat.com>
To:	"Yu, Fenghua" <fenghua.yu@...el.com>
CC:	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'Anton Vorontsov'" <avorontsov@...mvista.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	"'linux-ia64@...r.kernel.org'" <linux-ia64@...r.kernel.org>,
	"'Neil Horman'" <nhorman@...hat.com>,
	"'Eric W. Biederman'" <ebiederm@...ssion.com>,
	"'kamezawa.hiroyu@...fujitsu.com'" <kamezawa.hiroyu@...fujitsu.com>,
	"'Andi Kleen'" <andi@...stfloor.org>,
	"'Michael Ellerman'" <michael@...erman.id.au>,
	"'M. Mohan Kumar'" <mohan@...ibm.com>,
	"'akpm@...ux-foundation.org'" <akpm@...ux-foundation.org>,
	"'bernhard.walle@....de'" <bernhard.walle@....de>,
	"'Ingo Molnar'" <mingo@...e.hu>
Subject: Re: [Patch 4/8] ia64: implement crashkernel=auto

Yu, Fenghua wrote:
>> Since in patch 2/8 we already implement the generic part, this will
>> add the rest part for ia64.
>>
>> Signed-off-by: WANG Cong <amwang@...hat.com>
>> Cc: Fenghua Yu <fenghua.yu@...el.com>
>> Cc: Tony Luck <tony.luck@...el.com>
>>
>> ---
>>
>> Index: linux-2.6/arch/ia64/include/asm/kexec.h
>> ===================================================================
>> --- linux-2.6.orig/arch/ia64/include/asm/kexec.h
>> +++ linux-2.6/arch/ia64/include/asm/kexec.h
>> @@ -1,6 +1,7 @@
>> #ifndef _ASM_IA64_KEXEC_H
>> #define _ASM_IA64_KEXEC_H
>>
>> +#include <asm-generic/kexec.h>
>>
>> /* Maximum physical address we can use pages from */
>> #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
>> @@ -19,6 +20,49 @@
>>                 flush_icache_range(page_addr, page_addr + PAGE_SIZE); \
>>         } while(0)
>>
>> +#ifdef CONFIG_KEXEC_AUTO_RESERVE
>> +#define MBYTES(n) ((n)*1024*1024ULL)
>> +#define GBYTES(n) ((n)*1024*1024*1024ULL)
>> +/*
>> +       Memory size     Reserved memory
>> +       ===========     ===============
>> +       [4G, 12G)       256M
>> +       [12G, 128G)     512M
>> +       [128G, 256G)    768M
>> +       [256G, 378G)    1024M
>> +       [378G, 512G)    1536M
>> +       [512G, 768G)    2048M
>> +       [768G, )        3072M
>> + */
>> +static inline
>> +unsigned long long arch_default_crash_size(unsigned long long total_size)
>> +{
>>     
>
> This function shouldn't be inlined (Andrew commented this before). You might remove inline and add __init for this function. 
>
>   

Yeah, seems I missed Andrew's comment... :-/ I will update it.

>> +	unsigned long long ret;
>> +
>> +	if (total_size >= GBYTES(4) && total_size < GBYTES(12))
>> +		ret = MBYTES(256);
>> +	else if (total_size >= GBYTES(12) && total_size < GBYTES(128))
>> +		ret = MBYTES(512);
>> +	else if (total_size >= GBYTES(128) && total_size < GBYTES(256))
>> +		ret = MBYTES(768);
>> +	else if (total_size >= GBYTES(256) && total_size < GBYTES(378))
>> +		ret = MBYTES(1024);
>> +	else if (total_size >= GBYTES(318) && total_size < GBYTES(512))
>> +		ret = MBYTES(1536);
>> +	else if (total_size >= GBYTES(512) && total_size < GBYTES(768))
>> +		ret = MBYTES(2048);
>> +	else
>> +		ret = MBYTES(3072);
>> +	if (!ia64_platform_is("sn2") && !ia64_platform_is("uv"))
>> +		if (ret > GBYTES(4))
>> +			ret = ret / GBYTES(4) * MBYTES(256);
>>     
>
> This code doesn't make sense to me. What you really want is following code, right?
> +		if (total_size > GBYTES(4))
> +			ret = total_size / GBYTES(4) * MBYTEST(256)
>
>   
Nope. Check check_crashkernel_memory().

Thanks.


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