From: Christoph Hellwig <hch@infradead.org>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, Andi Kleen <ak@linux.intel.com>,
Rafael Aquini <aquini@redhat.com>,
Waiman Long <longman@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/1] x86: restore the write back cache of reserved RAM in iounmap()
Date: Thu, 19 Nov 2020 18:02:06 +0000 [thread overview]
Message-ID: <20201119180206.GA24054@infradead.org> (raw)
In-Reply-To: <20201119175902.17394-1-aarcange@redhat.com>
On Thu, Nov 19, 2020 at 12:59:01PM -0500, Andrea Arcangeli wrote:
> Hello everyone,
>
> We identified some PCD set on the direct mapping causing hardly
> reproducible performance issues and this patch fixes the ultimate root
> cause.
>
> The caller for now has been tweaked to avoid triggering this case (now
> that we know about it)
What is the callers? The whole SetPageReservered + ioremap* thing
you mention in the actual patch is completely bogus. I think we'll
need to reject that as well and fix the caller.
next prev parent reply other threads:[~2020-11-19 18:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-19 17:59 [PATCH 0/1] x86: restore the write back cache of reserved RAM in iounmap() Andrea Arcangeli
2020-11-19 17:59 ` [PATCH 1/1] " Andrea Arcangeli
2020-11-19 21:01 ` Thomas Gleixner
2020-11-19 18:02 ` Christoph Hellwig [this message]
2020-11-19 19:03 ` [PATCH 0/1] " Andrea Arcangeli
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