All of lore.kernel.org
 help / color / mirror / Atom feed
From: Michael Ellerman <mpe@ellerman.id.au>
To: Scott Wood <scottwood@freescale.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	linuxppc-dev@lists.ozlabs.org, benh@kernel.crashing.org,
	paulus@samba.org
Subject: Re: [PATCH v2 2/2] powerpc/mm: Change the swap encoding in pte.
Date: Thu, 18 Jun 2015 14:16:00 +1000	[thread overview]
Message-ID: <1434600960.25157.1.camel@ellerman.id.au> (raw)
In-Reply-To: <1434575662.2353.107.camel@freescale.com>

On Wed, 2015-06-17 at 16:14 -0500, Scott Wood wrote:
> On Wed, 2015-06-17 at 19:45 +1000, Michael Ellerman wrote:
> > On Wed, 2015-06-17 at 08:21 +0530, Aneesh Kumar K.V wrote:
> > > "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> writes:
> > > 
> > > 
> > > Hi Scott,
> > > 
> > > > Current swap encoding in pte can't support large pfns
> > > > above 4TB. Change the swap encoding such that we put
> > > > the swap type in the PTE bits. Also add build checks
> > > > to make sure we don't overlap with HPTEFLAGS.
> > > > 
> > > 
> > > Can you please review this w.r.t 64bit booke ? 
> 
> It looks OK.
> 
> I'm curious why _PAGE_BIT_SWAP_TYPE is 2 -- it seems like it could be 
> any value >= 1 that isn't large enough to cause a conflict. Does 
> something get stored in that second bit?
> 
> > I booted it on our p5020ds FWIW.
> 
> Actively using swap?

Yeah good point, it wasn't.

I ran 4 make -j kernel builds in parallel which seemed to do the trick:

               total       used       free     shared    buffers     cached
  Mem:       4053952    4038324      15628        344       2880      26932
  -/+ buffers/cache:    4008512      45440
  Swap:      7918588    6102800    1815788


Of course it went OOM not long after that, but it's still pinging and it's
running fine, just spending all its time printing the OOM kill info to the
console.

cheers

  reply	other threads:[~2015-06-18  4:16 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-17  2:43 [PATCH v2 1/2] powerpc/mm: PTE_RPN_MAX is not used, remove the same Aneesh Kumar K.V
2015-06-17  2:43 ` [PATCH v2 2/2] powerpc/mm: Change the swap encoding in pte Aneesh Kumar K.V
2015-06-17  2:51   ` Aneesh Kumar K.V
2015-06-17  9:45     ` Michael Ellerman
2015-06-17 21:14       ` Scott Wood
2015-06-18  4:16         ` Michael Ellerman [this message]
2015-06-18  5:20         ` Aneesh Kumar K.V

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=1434600960.25157.1.camel@ellerman.id.au \
    --to=mpe@ellerman.id.au \
    --cc=aneesh.kumar@linux.vnet.ibm.com \
    --cc=benh@kernel.crashing.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=paulus@samba.org \
    --cc=scottwood@freescale.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.