From: Ian Campbell <Ian.Campbell@citrix.com>
To: Ian Jackson <Ian.Jackson@eu.citrix.com>
Cc: wei.liu2@citrix.com, keir@xen.org,
stefano.stabellini@eu.citrix.com, andrew.cooper3@citrix.com,
xen-devel@lists.xen.org, will.auld@intel.com, JBeulich@suse.com,
Chao Peng <chao.p.peng@linux.intel.com>
Subject: Re: [PATCH v8 5/5] tools, docs: add total/local memory bandwith monitoring
Date: Wed, 28 Jan 2015 14:12:52 +0000 [thread overview]
Message-ID: <1422454372.5187.3.camel@citrix.com> (raw)
In-Reply-To: <21704.60889.831165.117853@mariner.uk.xensource.com>
On Wed, 2015-01-28 at 14:10 +0000, Ian Jackson wrote:
> Ian Campbell writes ("Re: [PATCH v8 5/5] tools, docs: add total/local memory bandwith monitoring"):
> ...
> > Another alternative would be to expose the instantaneous values to the
> > libxl user and let it sleep as it wishes and calculate the bandwidth
> > itself.
>
> I think that would be better.
>
> Suppose the libxl caller wants to record the mean bandwidth over a
> longer period: they shouldn't have to keep calling this function and
> adding up the results (and if they did their algorithm would be racy).
True.
>From the code it seems like there is some h/w constraint on roll over of
the underlying counter, which might complicate this somewhat. At the
very least the libxl interface docs would need to be quite extensive.
Ian.
next prev parent reply other threads:[~2015-01-28 14:12 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-28 8:04 [PATCH v8 0/5] enable Memory Bandwidth Monitoring (MBM) for VMs Chao Peng
2015-01-28 8:04 ` [PATCH v8 1/5] x86: allow reading MSR_IA32_TSC with XENPF_resource_op Chao Peng
2015-01-28 15:42 ` Jan Beulich
2015-01-29 6:35 ` Chao Peng
2015-01-28 8:04 ` [PATCH v8 2/5] tools: add routine to get CMT L3 event mask Chao Peng
2015-01-28 13:40 ` Ian Campbell
2015-01-29 8:32 ` Chao Peng
2015-01-28 8:04 ` [PATCH v8 3/5] tools: correct coding style for psr Chao Peng
2015-01-28 8:04 ` [PATCH v8 4/5] tools: code refactoring for MBM Chao Peng
2015-01-28 8:04 ` [PATCH v8 5/5] tools, docs: add total/local memory bandwith monitoring Chao Peng
2015-01-28 14:04 ` Ian Campbell
2015-01-28 14:10 ` Ian Jackson
2015-01-28 14:12 ` Ian Campbell [this message]
2015-01-29 8:17 ` Chao Peng
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