From: Mark Brown <broonie@kernel•org>
To: Will Deacon <will@kernel•org>
Cc: Catalin Marinas <catalin.marinas@arm•com>,
John Garry <john.garry@huawei•com>,
linux-arm-kernel@lists•infradead.org
Subject: Re: [PATCH v4 0/4] E0PD support
Date: Thu, 31 Oct 2019 14:00:18 +0100 [thread overview]
Message-ID: <20191031130018.GQ4568@sirena.org.uk> (raw)
In-Reply-To: <20191031124217.GE26059@willie-the-truck>
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On Thu, Oct 31, 2019 at 12:42:18PM +0000, Will Deacon wrote:
> On Thu, Oct 31, 2019 at 12:13:35PM +0000, John Garry wrote:
> > I booted our D05 and D06 boards with that branch and did not experience the
> > pauses which we reported some time ago.
> Hmm. So I annotated the code locally and I see that we do rewrite swapper
> in this case, so I'm surprised you're not seeing the performance issue
> you ran into with this before. Have you got KASLR enabled and are you
> passing a non-zero seed?
Gah, sorry - I tested change which sets arm64_use_ng_mappings
early, should be sitting on my machine at home, in mm/init.c.
That will mean that there's only a slowdown in cases where we
have a mix of E0PD and non-E0PD CPUs with the boot CPU having
E0PD, hopefully no such systems have very large amounts of
memory.
I'll post it Monday at the latest.
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next prev parent reply other threads:[~2019-10-31 13:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-24 21:42 [PATCH v4 0/4] E0PD support Mark Brown
2019-10-24 21:42 ` [PATCH v4 1/4] arm64: Add initial support for E0PD Mark Brown
2019-10-24 21:42 ` [PATCH v4 2/4] arm64: Factor out checks for KASLR in KPTI code into separate function Mark Brown
2019-10-24 21:42 ` [PATCH v4 3/4] arm64: Don't use KPTI where we have E0PD Mark Brown
2019-10-24 21:42 ` [PATCH v4 4/4] arm64: Use a variable to store non-global mappings decision Mark Brown
2019-10-30 12:13 ` Catalin Marinas
2019-10-30 12:41 ` Mark Brown
2019-10-30 14:17 ` Catalin Marinas
2019-10-31 8:18 ` Mark Brown
2019-10-31 10:18 ` Catalin Marinas
2019-10-31 10:35 ` Mark Brown
2019-11-04 17:20 ` Mark Brown
2019-10-30 12:26 ` [PATCH v4 0/4] E0PD support Catalin Marinas
2019-10-30 12:54 ` Mark Brown
2019-10-31 11:26 ` Will Deacon
2019-10-31 12:13 ` John Garry
2019-10-31 12:42 ` Will Deacon
2019-10-31 13:00 ` Mark Brown [this message]
2019-10-31 13:09 ` Will Deacon
2019-10-31 14:13 ` John Garry
2019-10-31 16:06 ` Ard Biesheuvel
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