From: Andi Kleen <andi@firstfloor.org>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Nadav Amit <namit@vmware.com>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>, Borislav Petkov <bp@suse.de>,
Toshi Kani <toshi.kani@hpe.com>,
Peter Zijlstra <peterz@infradead.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Ingo Molnar <mingo@kernel.org>, "Kleen\,
Andi" <andi.kleen@intel.com>
Subject: Re: [PATCH 3/3] resource: Introduce resource cache
Date: Thu, 20 Jun 2019 14:31:48 -0700 [thread overview]
Message-ID: <8736k49c57.fsf@firstfloor.org> (raw)
In-Reply-To: <CAPcyv4iAbWnWUT2d2VhnvuHvJE0-Vxgbf1TYtOPjkR6j3qROtw@mail.gmail.com> (Dan Williams's message of "Wed, 19 Jun 2019 14:53:54 -0700")
Dan Williams <dan.j.williams@intel.com> writes:
>
> The underlying issue is that the x86-PAT implementation wants to
> ensure that conflicting mappings are not set up for the same physical
> address. This is mentioned in the developer manuals as problematic on
> some cpus. Andi, is lookup_memtype() and track_pfn_insert() still
> relevant?
There have been discussions about it in the past, and the right answer
will likely differ for different CPUs: But so far the official answer
for Intel CPUs is that these caching conflicts should be avoided.
So I guess the cache in the original email makes sense for now.
-Andi
next prev parent reply other threads:[~2019-06-20 21:31 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-13 4:59 [PATCH 0/3] resource: find_next_iomem_res() improvements Nadav Amit
[not found] ` <20190613045903.4922-2-namit@vmware.com>
2019-06-15 22:15 ` [PATCH 1/3] resource: Fix locking in find_next_iomem_res() Sasha Levin
2019-06-17 19:14 ` Nadav Amit
2019-06-18 0:55 ` Sasha Levin
2019-06-18 1:32 ` Nadav Amit
2019-06-18 4:26 ` Andrew Morton
[not found] ` <20190613045903.4922-4-namit@vmware.com>
2019-06-15 22:16 ` [PATCH 3/3] resource: Introduce resource cache Sasha Levin
2019-06-17 17:20 ` Nadav Amit
2019-06-18 4:57 ` Andrew Morton
2019-06-18 5:33 ` Nadav Amit
2019-06-18 5:40 ` Nadav Amit
2019-06-19 13:00 ` Bjorn Helgaas
2019-06-19 20:35 ` Nadav Amit
2019-06-19 21:53 ` Dan Williams
2019-06-20 21:31 ` Andi Kleen [this message]
2019-06-20 23:13 ` Dan Williams
2019-06-18 6:44 ` [PATCH 0/3] resource: find_next_iomem_res() improvements Dan Williams
2019-06-18 17:42 ` Nadav Amit
2019-06-18 18:30 ` Dan Williams
2019-06-18 21:56 ` Nadav Amit
2019-07-16 22:00 ` Andrew Morton
2019-07-16 22:06 ` Nadav Amit
2019-07-16 22:07 ` Dan Williams
2019-07-16 22:13 ` Nadav Amit
2019-07-16 22:20 ` Dan Williams
2019-07-16 22:28 ` Nadav Amit
2019-07-16 22:45 ` Dan Williams
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