From: eric.dumazet@gmail.com (Eric Dumazet)
To: linux-arm-kernel@lists.infradead.org
Subject: [BUG] 2.6.37-rc3 massive interactivity regression on ARM
Date: Fri, 10 Dec 2010 21:49:25 +0100 [thread overview]
Message-ID: <1292014165.2746.9.camel@edumazet-laptop> (raw)
In-Reply-To: <1292013590.2746.2.camel@edumazet-laptop>
Le vendredi 10 d?cembre 2010 ? 21:39 +0100, Eric Dumazet a ?crit :
> This was exactly my suggestion Christoph.
>
> I am glad you understand it now.
>
>
By the way, we need smp_wmb(), not barrier(), even only the "owner cpu"
can write into its 'percpu' seqcount.
There is nothing special about a seqcount being percpu or a 'global'
one. We must have same memory barrier semantics.
this_cpu_write_seqcount_begin(&myseqcount);
this_cpu_add(mydata1, add1);
this_cpu_add(mydata2, add2);
this_cpu_inc(mydata3);
this_cpu_write_seqcount_end(&myseqcount);
We protect the data[1,2,3] set with a seqcount, so need smp_wmb() in
both _begin() and _end()
next prev parent reply other threads:[~2010-12-10 20:49 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-27 15:16 [BUG] 2.6.37-rc3 massive interactivity regression on ARM Mikael Pettersson
2010-12-05 12:32 ` Mikael Pettersson
2010-12-05 13:17 ` Russell King - ARM Linux
2010-12-05 14:19 ` Russell King - ARM Linux
2010-12-05 16:07 ` Mikael Pettersson
2010-12-05 16:21 ` Russell King - ARM Linux
2010-12-08 12:40 ` Peter Zijlstra
2010-12-08 12:55 ` Russell King - ARM Linux
2010-12-08 14:04 ` Peter Zijlstra
2010-12-08 14:28 ` Russell King - ARM Linux
2010-12-08 14:44 ` Peter Zijlstra
2010-12-08 15:05 ` Russell King - ARM Linux
2010-12-08 15:43 ` Linus Walleij
2010-12-08 20:42 ` john stultz
2010-12-08 23:31 ` Venkatesh Pallipadi
2010-12-09 12:52 ` Peter Zijlstra
2010-12-09 17:43 ` Venkatesh Pallipadi
2010-12-09 17:55 ` Peter Zijlstra
2010-12-09 18:11 ` Venkatesh Pallipadi
2010-12-09 18:55 ` Peter Zijlstra
2010-12-09 22:21 ` Venkatesh Pallipadi
2010-12-09 23:16 ` Peter Zijlstra
2010-12-09 23:35 ` Venkatesh Pallipadi
2010-12-10 10:08 ` Peter Zijlstra
2010-12-10 13:17 ` Peter Zijlstra
2010-12-10 13:27 ` Peter Zijlstra
2010-12-10 13:47 ` Peter Zijlstra
2010-12-10 16:50 ` Russell King - ARM Linux
2010-12-10 16:54 ` Peter Zijlstra
2010-12-10 17:18 ` Eric Dumazet
2010-12-10 17:49 ` Peter Zijlstra
2010-12-10 18:14 ` Eric Dumazet
2010-12-10 18:39 ` Christoph Lameter
2010-12-10 18:46 ` Peter Zijlstra
2010-12-10 19:51 ` Christoph Lameter
2010-12-10 20:07 ` Peter Zijlstra
2010-12-10 20:23 ` Christoph Lameter
2010-12-10 20:32 ` Peter Zijlstra
2010-12-10 20:39 ` Eric Dumazet
2010-12-10 20:49 ` Eric Dumazet [this message]
2010-12-10 21:09 ` Christoph Lameter
2010-12-10 21:22 ` Eric Dumazet
2010-12-10 21:45 ` Christoph Lameter
2010-12-10 17:56 ` Russell King - ARM Linux
2010-12-10 18:10 ` Peter Zijlstra
2010-12-10 18:43 ` Peter Zijlstra
2010-12-10 19:17 ` Russell King - ARM Linux
2010-12-10 19:37 ` Peter Zijlstra
2010-12-10 19:25 ` Peter Zijlstra
2010-12-13 14:33 ` Jack Daniel
2010-12-06 21:29 ` Venkatesh Pallipadi
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=1292014165.2746.9.camel@edumazet-laptop \
--to=eric.dumazet@gmail.com \
--cc=linux-arm-kernel@lists.infradead.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