From: "Jan Beulich" <jbeulich@novell.com>
To: Keir Fraser <keir@xensource.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: performance counters
Date: Fri, 16 Mar 2007 08:17:46 +0000 [thread overview]
Message-ID: <45FA60BA.76E4.0078.0@novell.com> (raw)
In-Reply-To: <C21F10B3.B8E3%keir@xensource.com>
>>> Keir Fraser <keir@xensource.com> 15.03.07 16:03 >>>
>On 15/3/07 14:37, "Jan Beulich" <jbeulich@novell.com> wrote:
>
>>> at least on architectures where we know the resulting incorrectness is not
>>> 'too bad' (that includes x86). Some of the shared counters are on hot paths.
>>> Alternatively we could make *all* counters per-cpu, even histogram counter
>>> arrays.
>>
>> To me that would seem like the better alternative than dropping atomicity.
>
>It has the added benefit of avoiding cacheline bouncing.
>
>It just needs someone to implement this improvement. ;-)
I'll take care of this, but it may take me a few days to get to it. But I
also think there's no need for rush here.
Jan
next prev parent reply other threads:[~2007-03-16 8:17 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-15 11:27 performance counters Jan Beulich
2007-03-15 11:58 ` Keir Fraser
2007-03-15 13:57 ` Jan Beulich
2007-03-15 14:01 ` Keir Fraser
2007-03-15 14:37 ` Jan Beulich
2007-03-15 15:03 ` Keir Fraser
2007-03-16 8:17 ` Jan Beulich [this message]
2007-03-16 8:21 ` Keir Fraser
2007-03-23 1:56 ` question about machine-to-physic table and phy-to-machine table tgh
2007-03-23 11:44 ` Daniel Stodden
2007-03-26 1:39 ` tgh
2007-03-27 4:14 ` Mark Williamson
2007-03-27 6:14 ` tgh
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