Subject: Re: [PATCH RFC 2/2] net: Optimize snmp stat aggregation by walking all the percpu data at once

From: Raghavendra K T <[email-masked]>
Date: Wed, 26 Aug 2015 16:34:29 +0530

On 08/25/2015 09:30 PM, Eric Dumazet wrote:
> On Tue, 2015-08-25 at 21:17 +0530, Raghavendra K T wrote:
>> On 08/25/2015 07:58 PM, Eric Dumazet wrote:
>
>>>
>>>
>>> This is a great idea, but kcalloc()/kmalloc() can fail and you'll crash
>>> the whole kernel at this point.
>>>
>>
>> Good catch, and my bad. Though system is in bad memory condition,
>> since fill_stat is not critical for the system do you think silently
>> returning from here is a good idea?
>> or do you think we should handle with -ENOMEM way up.?
>
> Hmm... presumably these 288 bytes could be allocated in
> inet6_fill_ifla6_attrs() stack frame.

Correct, since we need to allocate  for IPSTATS_MIB_MAX, we could do 
this in even snmp6_fill_stats() stack frame.