From: Mathieu Desnoyers <compudj@krystal.dyndns.org>
To: David Miller <davem@davemloft.net>
Cc: ltt-dev@lists.casi.polymtl.ca, mingo@elte.hu,
paulmck@linux.vnet.ibm.com, jwboyer@linux.vnet.ibm.com,
linux-kernel@vger.kernel.org
Subject: Re: cli/sti vs local_cmpxchg and local_add_return
Date: Tue, 17 Mar 2009 15:35:32 -0400 [thread overview]
Message-ID: <20090317193532.GA18503@Krystal> (raw)
In-Reply-To: <20090317.122816.246078801.davem@davemloft.net>
* David Miller (davem@davemloft.net) wrote:
> From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
> Date: Tue, 17 Mar 2009 12:06:35 -0400
>
> > But powerpc has non-maskable interrupts, so for less than 4 cycles, I
> > think it's better to stay with the local_t variant to be NMI-safe.
>
> Sparc64 has non-maskable interrupts too btw.
>
OK, this alone is a strong argument to favor NMI-safe lockless algorithm
even if it is a bit slower. We should see what kind of performance
impact it has on overall tracing performance to find out if it will make
a measurable difference anyway.
Mathieu
> _______________________________________________
> ltt-dev mailing list
> ltt-dev@lists.casi.polymtl.ca
> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
>
--
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
next prev parent reply other threads:[~2009-03-17 19:35 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-17 1:32 cli/sti vs local_cmpxchg and local_add_return Mathieu Desnoyers
2009-03-17 3:37 ` David Miller
2009-03-17 4:10 ` Mathieu Desnoyers
2009-03-17 4:27 ` David Miller
2009-03-17 4:44 ` Mathieu Desnoyers
2009-03-17 5:01 ` Paul E. McKenney
2009-03-17 16:06 ` Mathieu Desnoyers
2009-03-17 19:28 ` David Miller
2009-03-17 19:35 ` Mathieu Desnoyers [this message]
2009-03-17 6:05 ` Nick Piggin
2009-03-17 15:14 ` [ltt-dev] " Mathieu Desnoyers
2009-03-18 11:43 ` Nick Piggin
2009-03-18 15:10 ` Mathieu Desnoyers
2009-03-17 18:42 ` Alan D. Brunelle
2009-03-17 19:01 ` Andika Triwidada
2009-03-23 16:50 ` Mathieu Desnoyers
2009-03-18 11:56 ` Josh Boyer
2009-03-23 16:56 ` Mathieu Desnoyers
2009-03-23 17:04 ` Josh Boyer
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=20090317193532.GA18503@Krystal \
--to=compudj@krystal.dyndns.org \
--cc=davem@davemloft.net \
--cc=jwboyer@linux.vnet.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=ltt-dev@lists.casi.polymtl.ca \
--cc=mingo@elte.hu \
--cc=paulmck@linux.vnet.ibm.com \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.