Message-ID: <1440796183.11525.153.camel@perches.com>
Subject: Re: [PATCH RFC V2 2/2] net: Optimize snmp stat aggregation by
 walking all the percpu data at once
From: Joe Perches <joe@perches.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Miller <davem@davemloft.net>, raghavendra.kt@linux.vnet.ibm.com,
        edumazet@google.com, kuznet@ms2.inr.ac.ru, jmorris@namei.org,
        yoshfuji@linux-ipv6.org, kaber@trash.net, jiri@resnulli.us,
        hannes@stressinduktion.org, tom@herbertland.com, azhou@nicira.com,
        ebiederm@xmission.com, ipm@chirality.org.uk, nicolas.dichtel@6wind.com,
        serge.hallyn@canonical.com, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, anton@au1.ibm.com,
        nacc@linux.vnet.ibm.com, srikar@linux.vnet.ibm.com
Date: Fri, 28 Aug 2015 14:09:43 -0700
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References: <1440610653-14210-3-git-send-email-raghavendra.kt@linux.vnet.ibm.com>
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	 <1440789654.11525.137.camel@perches.com>
	 <1440794020.8932.45.camel@edumazet-glaptop2.roam.corp.google.com>
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On Fri, 2015-08-28 at 13:55 -0700, Eric Dumazet wrote:
> On Fri, 2015-08-28 at 13:53 -0700, Joe Perches wrote:
> > On Fri, 2015-08-28 at 13:33 -0700, Eric Dumazet wrote:
> > > We do not bother for small struct.
> > > 
> > > Here, the array is big enough that David prefers having an explicit
> > > memset() so that it clearly shows that author of this code was aware of
> > > this.
> > 
> > It's 288 bytes on stack, maybe a kzalloc would be clearer too.
> 
> Could you read patch history and check why this has been rejected ?

I don't see a rejection, just that the initial
submission didn't check the allocation or add
an allocation buffer via kcalloc/kzalloc to the
inet6_fill_ifla6_attrs caller and change the
snmp6_fill_stats arguments.

It could also eliminate the put_unaligned calls.

https://lkml.org/lkml/2015/8/25/114

Was there some other thread?


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