linux-kernel - Re: [net-next][PATCH v2 18/18] RDS: IB: add missing connection cache usage info

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Date:   Wed, 7 Dec 2016 08:44:04 -0800
From:   Santosh Shilimkar <santosh.shilimkar@...cle.com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next][PATCH v2 18/18] RDS: IB: add missing connection cache
 usage info

On 12/7/2016 7:55 AM, David Miller wrote:
> From: Santosh Shilimkar <santosh.shilimkar@...cle.com>
> Date: Tue,  6 Dec 2016 20:01:56 -0800
>
>> rds-tools already support it.
>>
>> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>
>> ---
>>  include/uapi/linux/rds.h | 1 +
>>  net/rds/ib.c             | 1 +
>>  2 files changed, 2 insertions(+)
>>
>> diff --git a/include/uapi/linux/rds.h b/include/uapi/linux/rds.h
>> index 3833113..410ae3c 100644
>> --- a/include/uapi/linux/rds.h
>> +++ b/include/uapi/linux/rds.h
>> @@ -183,6 +183,7 @@ struct rds_info_rdma_connection {
>>  	uint32_t	max_send_sge;
>>  	uint32_t	rdma_mr_max;
>>  	uint32_t	rdma_mr_size;
>> +	uint32_t	cache_allocs;
>>  };
>>
>>  /* RDS message Receive Path Latency points */
>
> What level of compatability exists here?  If we run an old tool on a new
> kernel, or a new tool on an old kernel, does it work properly?
>
Tools repo carries a copy of the header and thats how the old tool and
new tools have been running with older/newer kernels. There are few more
bits left before I can start using directly kernel header for newer
tools.

Moreover this particular parameter is only used for verbose mode which
isn't used in default options.

Regards,
Santosh