From: Chao Peng <chao.p.peng@linux.intel.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: wei.liu2@citrix.com, Ian.Campbell@citrix.com,
stefano.stabellini@eu.citrix.com, andrew.cooper3@citrix.com,
dario.faggioli@citrix.com, Ian.Jackson@eu.citrix.com,
xen-devel@lists.xen.org, will.auld@intel.com, keir@xen.org,
dgdegra@tycho.nsa.gov
Subject: Re: [PATCH v8 03/13] x86: maintain COS to CBM mapping for each socket
Date: Mon, 1 Jun 2015 16:56:21 +0800 [thread overview]
Message-ID: <20150601085621.GB3773@pengc-linux.bj.intel.com> (raw)
In-Reply-To: <556C359F020000780007F8DF@mail.emea.novell.com>
On Mon, Jun 01, 2015 at 09:36:15AM +0100, Jan Beulich wrote:
> >>> On 01.06.15 at 10:05, <chao.p.peng@linux.intel.com> wrote:
> > 2) Unfeasible to allocate memory first and do initialization later in
> > cpu hotplug notifications. My former approach is performing both the
> > allocation and initialization in the CPU_STARTING, which is not a good
> > idea indicated by Jan.
>
> Considering
>
> info->cos_max = min(opt_cos_max, edx & 0xffff);
>
> I don't see why you couldn't do an allocation using opt_cos_max
> in CPU_UP_PREPARE, potentially not using all of the slots later
> on.
If memory waste is not a problem (especially in most cases opt_cos_max is
its default 255), then this would be a solution.
As you have suggested this, then I think I can go on this path and still
have asymmetry systems been supported.
Thanks,
Chao
next prev parent reply other threads:[~2015-06-01 8:56 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-21 8:41 [PATCH v8 00/13] enable Cache Allocation Technology (CAT) for VMs Chao Peng
2015-05-21 8:41 ` [PATCH v8 01/13] x86: add socket_cpumask Chao Peng
2015-05-28 12:38 ` Jan Beulich
2015-05-29 2:35 ` Chao Peng
2015-05-29 8:01 ` Jan Beulich
2015-05-29 8:28 ` Chao Peng
2015-05-29 8:52 ` Jan Beulich
2015-06-02 6:35 ` Chao Peng
2015-06-02 6:57 ` Jan Beulich
2015-06-02 7:19 ` Chao Peng
2015-05-21 8:41 ` [PATCH v8 02/13] x86: detect and initialize Intel CAT feature Chao Peng
2015-05-28 12:54 ` Jan Beulich
2015-05-29 2:40 ` Chao Peng
2015-05-29 8:03 ` Jan Beulich
2015-05-21 8:41 ` [PATCH v8 03/13] x86: maintain COS to CBM mapping for each socket Chao Peng
2015-05-28 13:17 ` Jan Beulich
2015-05-29 2:43 ` Chao Peng
2015-05-29 8:06 ` Jan Beulich
2015-05-29 8:38 ` Chao Peng
2015-06-01 8:05 ` Chao Peng
2015-06-01 8:36 ` Jan Beulich
2015-06-01 8:56 ` Chao Peng [this message]
2015-05-21 8:41 ` [PATCH v8 04/13] x86: add COS information for each domain Chao Peng
2015-05-21 8:41 ` [PATCH v8 05/13] x86: expose CBM length and COS number information Chao Peng
2015-05-28 13:26 ` Jan Beulich
2015-05-28 15:46 ` Dario Faggioli
2015-05-29 2:47 ` Chao Peng
2015-05-29 8:07 ` Jan Beulich
2015-05-29 9:23 ` Dario Faggioli
2015-05-29 9:29 ` Jan Beulich
2015-05-21 8:41 ` [PATCH v8 06/13] x86: dynamically get/set CBM for a domain Chao Peng
2015-05-21 8:41 ` [PATCH v8 07/13] x86: add scheduling support for Intel CAT Chao Peng
2015-05-21 8:41 ` [PATCH v8 08/13] xsm: add CAT related xsm policies Chao Peng
2015-05-21 8:41 ` [PATCH v8 09/13] tools/libxl: minor name changes for CMT commands Chao Peng
2015-05-21 8:41 ` [PATCH v8 10/13] tools/libxl: add command to show PSR hardware info Chao Peng
2015-05-21 8:41 ` [PATCH v8 11/13] tools/libxl: introduce some socket helpers Chao Peng
2015-05-21 8:41 ` [PATCH v8 12/13] tools: add tools support for Intel CAT Chao Peng
2015-05-21 8:41 ` [PATCH v8 13/13] docs: add xl-psr.markdown Chao Peng
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=20150601085621.GB3773@pengc-linux.bj.intel.com \
--to=chao.p.peng@linux.intel.com \
--cc=Ian.Campbell@citrix.com \
--cc=Ian.Jackson@eu.citrix.com \
--cc=JBeulich@suse.com \
--cc=andrew.cooper3@citrix.com \
--cc=dario.faggioli@citrix.com \
--cc=dgdegra@tycho.nsa.gov \
--cc=keir@xen.org \
--cc=stefano.stabellini@eu.citrix.com \
--cc=wei.liu2@citrix.com \
--cc=will.auld@intel.com \
--cc=xen-devel@lists.xen.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;
as well as URLs for NNTP newsgroup(s).