From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Anton Blanchard <anton@ozlabs.org>,
benh@kernel.crashing.org, paulus@samba.org,
mahesh@linux.vnet.ibm.com, srikar@linux.vnet.ibm.com,
hbathini@linux.vnet.ibm.com
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: powerpc/pseries: Use H_CLEAR_HPT to clear MMU hash table during kexec
Date: Mon, 14 Nov 2016 23:17:27 +1100 (AEDT) [thread overview]
Message-ID: <3tHTzq6cHlz9t2C@ozlabs.org> (raw)
In-Reply-To: <1475318516-8447-1-git-send-email-anton@ozlabs.org>
On Sat, 2016-01-10 at 10:41:56 UTC, Anton Blanchard wrote:
> From: Anton Blanchard <anton@samba.org>
>
> An hcall was recently added that does exactly what we need
> during kexec - it clears the entire MMU hash table, ignoring any
> VRMA mappings.
>
> Try it and fall back to the old method if we get a failure.
>
> On a POWER8 box with 5TB of memory, this reduces the time it takes to
> kexec a new kernel from from 4 minutes to 1 minute.
>
> Signed-off-by: Anton Blanchard <anton@samba.org>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/5246adec59458b5d325b8e1462ea9e
cheers
prev parent reply other threads:[~2016-11-14 12:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-01 10:41 [PATCH] powerpc/pseries: Use H_CLEAR_HPT to clear MMU hash table during kexec Anton Blanchard
2016-10-27 6:26 ` Mahesh Jagannath Salgaonkar
2016-11-14 12:17 ` Michael Ellerman [this message]
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