Subject: Re: [PATCH 4/8] v2 Allow memory block to span multiple memory sections

From: Nathan Fontenot <[email-masked]>
Date: Tue, 28 Sep 2010 13:20:42 -0500

On 09/28/2010 07:48 AM, Robin Holt wrote:
>> +u32 __weak memory_block_size_bytes(void)
>> +{
>> +	return MIN_MEMORY_BLOCK_SIZE;
>> +}
>> +
>> +static u32 get_memory_block_size(void)
> 
> Can we make this an unsigned long?  We are testing on a system whose
> smallest possible configuration is 4GB per socket with 512 sockets.
> We would like to be able to specify this as 2GB by default (results
> in the least lost memory) and suggest we add a command line option
> which overrides this value.  We have many installations where 16GB may
> be optimal.  Large configurations will certainly become more prevalent.

Works for me.

> 
> ...
>> @@ -551,12 +608,16 @@
>>  	unsigned int i;
>>  	int ret;
>>  	int err;
>> +	int block_sz;
> 
> This one needs to match the return above.  In our tests, we ended up
> with a negative sections_per_block which caused very unexpected results.

Oh, nice catch.  I'll update both of these.

-Nathan