From: David Miller <davem@davemloft.net>
To: shemminger@linux-foundation.org
Cc: netdev@vger.kernel.org
Subject: Re: [patch 4/4] tcp: statistics not read_mostly
Date: Mon, 12 Mar 2007 14:33:06 -0700 (PDT) [thread overview]
Message-ID: <20070312.143306.18307677.davem@davemloft.net> (raw)
In-Reply-To: <20070312142647.57038d85@freekitty>
From: Stephen Hemminger <shemminger@linux-foundation.org>
Date: Mon, 12 Mar 2007 14:26:47 -0700
> On Mon, 12 Mar 2007 14:15:50 -0700 (PDT)
> David Miller <davem@davemloft.net> wrote:
>
> > Look at the definition of DEFINE_SNMP_STAT().
>
> Okay, that's confusing. And maybe the comment suggests future work:
Indeed.
> /*
> * FIXME: On x86 and some other CPUs the split into user and softirq parts
> * is not needed because addl $1,memory is atomic against interrupts (but
> * atomic_inc would be overkill because of the lock cycles). Wants new
> * nonlocked_atomic_inc() primitives -AK
> */
Yep. And another interesting case are straight loads and stores of
per-cpu values on platforms that have a PDA'ish thing like x86_64 and
sparc64. The latter has the per-cpu base in a register so in several
cases the usual preemption protection simply does not matter and we
could optimize them away.
next prev parent reply other threads:[~2007-03-12 21:33 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-12 21:08 [patch 0/4] more stuff for 2.6.22 Stephen Hemminger
2007-03-12 21:08 ` [patch 1/4] network dev read_mostly Stephen Hemminger
2007-03-12 21:34 ` David Miller
2007-03-13 5:37 ` Eric Dumazet
2007-03-13 21:26 ` [RFC] Get rid of netdev_nit Stephen Hemminger
2007-04-21 0:02 ` David Miller
2007-03-15 2:18 ` [patch 1/4] network dev read_mostly Benjamin LaHaise
2007-03-15 4:54 ` David Miller
2007-03-15 6:28 ` Eric Dumazet
2007-03-15 7:25 ` David Miller
2007-03-15 7:42 ` Eric Dumazet
2007-03-15 13:17 ` Benjamin LaHaise
2007-03-16 17:03 ` Stephen Hemminger
2007-03-15 15:10 ` Andi Kleen
2007-03-12 21:08 ` [patch 2/4] net: make seq_operations const Stephen Hemminger
2007-03-12 21:34 ` David Miller
2007-03-12 21:08 ` [patch 3/4] net: show bound packet types Stephen Hemminger
2007-03-12 21:35 ` David Miller
2007-03-12 21:08 ` [patch 4/4] tcp: statistics not read_mostly Stephen Hemminger
2007-03-12 21:15 ` David Miller
2007-03-12 21:26 ` Stephen Hemminger
2007-03-12 21:33 ` David Miller [this message]
2007-03-13 20:09 ` Andi Kleen
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