From: Michael Ellerman <mpe@ellerman.id.au>
To: Laurent Dufour <ldufour@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org, benh@kernel.crashing.org,
paulus@samba.org, aneesh.kumar@linux.vnet.ibm.com,
kda@linux-powerpc.org
Cc: xemul@parallels.com
Subject: Re: [v5] powerpc/mm: Add page soft dirty tracking
Date: Thu, 17 Dec 2015 22:57:32 +1100 (AEDT) [thread overview]
Message-ID: <20151217115732.7AB091402E2@ozlabs.org> (raw)
In-Reply-To: <1449138559-10205-1-git-send-email-ldufour@linux.vnet.ibm.com>
On Thu, 2015-03-12 at 10:29:19 UTC, Laurent Dufour wrote:
> User space checkpoint and restart tool (CRIU) needs the page's change
> to be soft tracked. This allows to do a pre checkpoint and then dump
> only touched pages.
>
> This is done by using a newly assigned PTE bit (_PAGE_SOFT_DIRTY) when
> the page is backed in memory, and a new _PAGE_SWP_SOFT_DIRTY bit when
> the page is swapped out.
>
> To introduce a new PTE _PAGE_SOFT_DIRTY bit value common to hash 4k
> and hash 64k pte, the bits already defined in hash-*4k.h should be
> shifted left by one.
>
> The _PAGE_SWP_SOFT_DIRTY bit is dynamically put after the swap type in
> the swap pte. A check is added to ensure that the bit is not
> overwritten by _PAGE_HPTEFLAGS.
>
> Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
> CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/7207f43665b83ed7881c5111bc
cheers
prev parent reply other threads:[~2015-12-17 11:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-03 10:29 [PATCH v5] powerpc/mm: Add page soft dirty tracking Laurent Dufour
2015-12-17 11:57 ` Michael Ellerman [this message]
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=20151217115732.7AB091402E2@ozlabs.org \
--to=mpe@ellerman.id.au \
--cc=aneesh.kumar@linux.vnet.ibm.com \
--cc=benh@kernel.crashing.org \
--cc=kda@linux-powerpc.org \
--cc=ldufour@linux.vnet.ibm.com \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=paulus@samba.org \
--cc=xemul@parallels.com \
/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).