netdev - Re: [PATCH] net: Make synchronize_net() be expedited only when it's really need

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Message-ID: <a62606ed-df12-4406-3e22-5387809734b4@virtuozzo.com>
Date:   Tue, 23 Jan 2018 20:09:04 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        David Ahern <dsahern@...il.com>,
        Florian Westphal <fw@...len.de>,
        Xin Long <lucien.xin@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        mschiffer@...verse-factory.net, jakub.kicinski@...ronome.com,
        Vladislav Yasevich <vyasevich@...il.com>,
        Jiri Benc <jbenc@...hat.com>
Subject: Re: [PATCH] net: Make synchronize_net() be expedited only when it's
 really need

On 23.01.2018 19:58, Eric Dumazet wrote:
>>
>> Your original patch did not provide any test results. Only the fact synchronize_rcu_expedited()
>> completes faster than plain synchronize_rcu(). But this is an obvious fact
>> just because of the design, and this is described even in the documentation.
>> Beleive me, I don't want to offend you this words, but it's strange you hadn't
>> gone the way you suggest me.
> 
> Well, I guess you missed the fine changelog.
> 
> Please carefully read it :
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=be3fc413da9eb17cce0991f214ab019d16c88c41

This is just what I said.

> And you' ll noticed I had an Ack from Paul E. McKenney, the RCU maintainer.
I won't ask you either you had the ACK before you sent the patch, because
the answer is obvious.

Anyway, this doesn't matter. I don't insist on the fix for this place.
If you're so negative on this question, we may leave everything as is,
and live with this ambiguous place several years more.

Kirill