From: Rob Gardner <rob.gardner@oracle.com>
To: Dave Hansen <dave.hansen@linux.intel.com>,
Khalid Aziz <khalid.aziz@oracle.com>,
davem@davemloft.net, corbet@lwn.net, arnd@arndb.de,
akpm@linux-foundation.org
Cc: hpa@zytor.com, viro@zeniv.linux.org.uk, nitin.m.gupta@oracle.com,
chris.hyser@oracle.com, tushar.n.dave@oracle.com,
sowmini.varadhan@oracle.com, mike.kravetz@oracle.com,
adam.buchbinder@gmail.com, minchan@kernel.org, hughd@google.com,
kirill.shutemov@linux.intel.com, keescook@chromium.org,
allen.pais@oracle.com, aryabinin@virtuozzo.com,
atish.patra@oracle.com, joe@perches.com, pmladek@suse.com,
jslaby@suse.cz, cmetcalf@mellanox.com,
paul.gortmaker@windriver.com, mhocko@suse.com,
jmarchan@redhat.com, lstoakes@gmail.com, 0x7f454c46@gmail.com,
vbabka@suse.cz, tglx@linutronix.de, mingo@redhat.com,
dan.j.williams@intel.com, iamjoonsoo.kim@lge.com,
mgorman@techsingularity.net, vdavydov.dev@gmail.com,
hannes@cmpxchg.org, namit@vmware.com, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org,
linux-arch@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org,
Khalid Aziz <khalid@gonehiking.org>
Subject: Re: [RFC PATCH v3] sparc64: Add support for Application Data Integrity (ADI)
Date: Wed, 4 Jan 2017 16:05:23 -0800 [thread overview]
Message-ID: <5a0270ea-b29a-0751-a27f-2412a8588561@oracle.com> (raw)
In-Reply-To: <db31d324-a1ae-7450-0e54-ad98da205773@linux.intel.com>
On 01/04/2017 04:01 PM, Dave Hansen wrote:
> On 01/04/2017 03:58 PM, Khalid Aziz wrote:
>>> How does this all work with large pages?
>> It works with large pages the same way as normal sized pages. The TTE
>> for a large page also will have the mcd bit set in it and tags are set
>> and referenced the same way.
> But does the user setting the tags need to know what the page size is?
>
> What if two different small pages have different tags and khugepaged
> comes along and tries to collapse them? Will the page be split if a
> user attempts to set two different tags inside two different small-page
> portions of a single THP?
The MCD tags operate at a resolution of cache lines (64 bytes). Page
sizes don't matter except that each virtual page must have a bit set in
its TTE to allow MCD to be enabled on the page. Any page can have many
different tags, one for each cache line.
Rob
next prev parent reply other threads:[~2017-01-05 0:06 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-04 22:46 [RFC PATCH v3] sparc64: Add support for Application Data Integrity (ADI) Khalid Aziz
2017-01-04 23:27 ` Dave Hansen
2017-01-04 23:35 ` Rob Gardner
2017-01-04 23:40 ` Dave Hansen
2017-01-04 23:44 ` Rob Gardner
2017-01-04 23:49 ` Dave Hansen
2017-01-04 23:56 ` Rob Gardner
2017-01-04 23:58 ` Khalid Aziz
2017-01-05 0:01 ` Dave Hansen
2017-01-05 0:05 ` Rob Gardner [this message]
2017-01-05 0:14 ` Dave Hansen
2017-01-05 0:26 ` Khalid Aziz
2017-01-05 19:22 ` Dave Hansen
2017-01-05 20:30 ` Khalid Aziz
2017-01-06 9:19 ` Michal Hocko
2017-01-06 15:32 ` Khalid Aziz
2017-01-06 15:36 ` Dave Hansen
2017-01-06 16:22 ` Khalid Aziz
2017-01-06 16:25 ` David Miller
2017-01-06 16:55 ` Dave Hansen
2017-01-06 17:02 ` David Miller
2017-01-06 17:10 ` Khalid Aziz
2017-01-06 17:54 ` Rob Gardner
2017-01-06 18:18 ` Khalid Aziz
2017-01-06 18:28 ` Rob Gardner
2017-01-06 17:08 ` Khalid Aziz
2017-01-04 23:43 ` Khalid Aziz
2017-01-04 23:31 ` Dave Hansen
2017-01-04 23:46 ` Khalid Aziz
2017-01-04 23:50 ` Dave Hansen
2017-01-05 9:37 ` Jerome Marchand
2017-01-05 15:13 ` Khalid Aziz
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=5a0270ea-b29a-0751-a27f-2412a8588561@oracle.com \
--to=rob.gardner@oracle.com \
--cc=0x7f454c46@gmail.com \
--cc=adam.buchbinder@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=allen.pais@oracle.com \
--cc=arnd@arndb.de \
--cc=aryabinin@virtuozzo.com \
--cc=atish.patra@oracle.com \
--cc=chris.hyser@oracle.com \
--cc=cmetcalf@mellanox.com \
--cc=corbet@lwn.net \
--cc=dan.j.williams@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=davem@davemloft.net \
--cc=hannes@cmpxchg.org \
--cc=hpa@zytor.com \
--cc=hughd@google.com \
--cc=iamjoonsoo.kim@lge.com \
--cc=jmarchan@redhat.com \
--cc=joe@perches.com \
--cc=jslaby@suse.cz \
--cc=keescook@chromium.org \
--cc=khalid.aziz@oracle.com \
--cc=khalid@gonehiking.org \
--cc=kirill.shutemov@linux.intel.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=lstoakes@gmail.com \
--cc=mgorman@techsingularity.net \
--cc=mhocko@suse.com \
--cc=mike.kravetz@oracle.com \
--cc=minchan@kernel.org \
--cc=mingo@redhat.com \
--cc=namit@vmware.com \
--cc=nitin.m.gupta@oracle.com \
--cc=paul.gortmaker@windriver.com \
--cc=pmladek@suse.com \
--cc=sowmini.varadhan@oracle.com \
--cc=sparclinux@vger.kernel.org \
--cc=tglx@linutronix.de \
--cc=tushar.n.dave@oracle.com \
--cc=vbabka@suse.cz \
--cc=vdavydov.dev@gmail.com \
--cc=viro@zeniv.linux.org.uk \
--cc=x86@kernel.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).