From: Eric Dumazet <eric.dumazet@gmail.com>
To: David Miller <davem@davemloft.net>, tglx@linutronix.de
Cc: stephen@networkplumber.org, a.darwish@linutronix.de,
peterz@infradead.org, mingo@redhat.com, will@kernel.org,
paulmck@kernel.org, bigeasy@linutronix.de, rostedt@goodmis.org,
linux-kernel@vger.kernel.org, kuba@kernel.org,
netdev@vger.kernel.org
Subject: Re: [PATCH v1 01/25] net: core: device_rename: Use rwsem instead of a seqcount
Date: Tue, 19 May 2020 20:18:19 -0700 [thread overview]
Message-ID: <886041df-d889-3d88-59fe-e190d15f9c98@gmail.com> (raw)
In-Reply-To: <20200519.195722.1091264300612213554.davem@davemloft.net>
On 5/19/20 7:57 PM, David Miller wrote:
> From: Thomas Gleixner <tglx@linutronix.de>
> Date: Wed, 20 May 2020 01:42:30 +0200
>
>> Stephen Hemminger <stephen@networkplumber.org> writes:
>>> On Wed, 20 May 2020 00:23:48 +0200
>>> Thomas Gleixner <tglx@linutronix.de> wrote:
>>>> No. We did not. -ENOTESTCASE
>>>
>>> Please try, it isn't that hard..
>>>
>>> # time for ((i=0;i<1000;i++)); do ip li add dev dummy$i type dummy; done
>>>
>>> real 0m17.002s
>>> user 0m1.064s
>>> sys 0m0.375s
>>
>> And that solves the incorrectness of the current code in which way?
>
> You mentioned that there wasn't a test case, he gave you one to try.
>
I do not think this would ever use device rename, nor netdev_get_name()
None of this stuff is fast path really.
# time for ((i=1;i<1000;i++)); do ip li add dev dummy$i type dummy; done
real 0m1.127s
user 0m0.270s
sys 0m1.039s
next prev parent reply other threads:[~2020-05-20 3:18 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-19 21:45 [PATCH v1 00/25] seqlock: Extend seqcount API with associated locks Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 01/25] net: core: device_rename: Use rwsem instead of a seqcount Ahmed S. Darwish
2020-05-19 22:01 ` Stephen Hemminger
2020-05-19 22:23 ` Thomas Gleixner
2020-05-19 23:11 ` Stephen Hemminger
2020-05-19 23:42 ` Thomas Gleixner
2020-05-20 0:06 ` Stephen Hemminger
2020-05-20 1:55 ` Thomas Gleixner
2020-05-20 2:57 ` David Miller
2020-05-20 3:18 ` Eric Dumazet [this message]
2020-05-20 4:36 ` Stephen Hemminger
2020-05-20 19:37 ` Thomas Gleixner
2020-05-20 21:36 ` Stephen Hemminger
2020-05-20 2:01 ` Eric Dumazet
2020-05-20 6:42 ` Ahmed S. Darwish
2020-05-20 12:51 ` Eric Dumazet
2020-06-03 14:33 ` Ahmed S. Darwish
2020-05-20 14:37 ` Dan Carpenter
2020-05-25 16:22 ` Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 03/25] net: phy: fixed_phy: Remove unused seqcount Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 05/25] u64_stats: Document writer non-preemptibility requirement Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 15/25] netfilter: conntrack: Use sequence counter with associated spinlock Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 16/25] netfilter: nft_set_rbtree: Use sequence counter with associated rwlock Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 17/25] xfrm: policy: Use sequence counters with associated lock Ahmed S. Darwish
2020-06-08 0:57 ` [PATCH v2 00/18] seqlock: Extend seqcount API with associated locks Ahmed S. Darwish
2020-06-08 0:57 ` [PATCH v2 08/18] netfilter: conntrack: Use sequence counter with associated spinlock Ahmed S. Darwish
2020-06-08 0:57 ` [PATCH v2 09/18] netfilter: nft_set_rbtree: Use sequence counter with associated rwlock Ahmed S. Darwish
2020-06-08 0:57 ` [PATCH v2 10/18] xfrm: policy: Use sequence counters with associated lock Ahmed S. Darwish
2020-06-30 5:44 ` [PATCH v3 00/20] seqlock: Extend seqcount API with associated locks Ahmed S. Darwish
2020-06-30 5:44 ` [PATCH v3 10/20] netfilter: conntrack: Use sequence counter with associated spinlock Ahmed S. Darwish
2020-06-30 5:44 ` [PATCH v3 11/20] netfilter: nft_set_rbtree: Use sequence counter with associated rwlock Ahmed S. Darwish
2020-06-30 5:44 ` [PATCH v3 12/20] xfrm: policy: Use sequence counters with associated lock Ahmed S. Darwish
2020-07-20 15:55 ` [PATCH v4 00/24] seqlock: Extend seqcount API with associated locks Ahmed S. Darwish
2020-07-20 15:55 ` [PATCH v4 14/24] netfilter: conntrack: Use sequence counter with associated spinlock Ahmed S. Darwish
2020-07-20 15:55 ` [PATCH v4 15/24] netfilter: nft_set_rbtree: Use sequence counter with associated rwlock Ahmed S. Darwish
2020-07-20 15:55 ` [PATCH v4 16/24] xfrm: policy: Use sequence counters with associated lock Ahmed S. Darwish
2020-07-20 16:49 ` [PATCH v4 00/24] seqlock: Extend seqcount API with associated locks Eric Biggers
2020-07-20 17:33 ` Ahmed S. Darwish
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=886041df-d889-3d88-59fe-e190d15f9c98@gmail.com \
--to=eric.dumazet@gmail.com \
--cc=a.darwish@linutronix.de \
--cc=bigeasy@linutronix.de \
--cc=davem@davemloft.net \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=paulmck@kernel.org \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=stephen@networkplumber.org \
--cc=tglx@linutronix.de \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).