From: Michael Ellerman <patch-notifications@ellerman•id.au>
To: Anton Blanchard <anton@ozlabs•org>,
benh@kernel•crashing.org, paulus@samba•org,
bharata@linux•vnet.ibm.com, arbab@linux•vnet.ibm.com,
npiggin@gmail•com, mikey@neuling•org, cyrilbur@gmail•com,
aneesh.kumar@linux•vnet.ibm.com
Cc: linuxppc-dev@lists•ozlabs.org
Subject: Re: powerpc/powernv: Increase memory block size to 1GB on radix
Date: Fri, 6 Oct 2017 22:10:04 +1100 (AEDT) [thread overview]
Message-ID: <3y7n3c2442z9t4b@ozlabs.org> (raw)
In-Reply-To: <20170907050551.4632-1-anton@ozlabs.org>
On Thu, 2017-09-07 at 05:05:51 UTC, Anton Blanchard wrote:
> From: Anton Blanchard <anton@samba•org>
>
> Memory hot unplug on PowerNV radix hosts is broken. Our memory block
> size is 256MB but since we map the linear region with very large pages,
> each pte we tear down maps 1GB.
>
> A hot unplug of one 256MB memory block results in 768MB of memory
> getting unintentionally unmapped. At this point we are likely to oops.
>
> Fix this by increasing our memory block size to 1GB on PowerNV radix
> hosts.
>
> Signed-off-by: Anton Blanchard <anton@samba•org>
Applied to powerpc fixes, thanks.
https://git.kernel.org/powerpc/c/53ecde0b9126ff140abe3aefd7f0ec
cheers
prev parent reply other threads:[~2017-10-06 11:10 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-07 5:05 [PATCH] powerpc/powernv: Increase memory block size to 1GB on radix Anton Blanchard
2017-09-07 5:09 ` Aneesh Kumar K.V
2017-09-07 5:17 ` Anton Blanchard
2017-09-07 7:21 ` Benjamin Herrenschmidt
2017-09-08 21:51 ` Balbir Singh
2017-09-07 15:59 ` Reza Arbab
2017-09-08 1:15 ` Anton Blanchard
2017-09-09 21:30 ` Michael Ellerman
2017-10-06 11:10 ` Michael Ellerman [this message]
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