From: Dave Hansen <dave.hansen@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: "Linus Torvalds" <torvalds@linux-foundation.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
"Andrea Arcangeli" <aarcange@redhat.com>,
"Andrew Lutomirski" <luto@kernel.org>,
"Kees Cook" <keescook@google.com>,
"Hugh Dickins" <hughd@google.com>,
"Jürgen Groß" <jgross@suse.com>,
"the arch/x86 maintainers" <x86@kernel.org>,
namit@vmware.com
Subject: Re: [PATCH 00/11] Use global pages with PTI
Date: Tue, 27 Mar 2018 09:32:27 -0700 [thread overview]
Message-ID: <c0e7ca0b-dcb5-66e2-9df6-f53e4eb22781@linux.intel.com> (raw)
In-Reply-To: <alpine.DEB.2.21.1803271526260.1964@nanos.tec.linutronix.de>
On 03/27/2018 06:36 AM, Thomas Gleixner wrote:
>> User Time Kernel Time Clock Elapsed
>> Baseline ( 0 GLB PTEs) 803.79 67.77 237.30
>> w/series (28 GLB PTEs) 807.70 (+0.7%) 68.07 (+0.7%) 238.07 (+0.3%)
>>
>> Without PCIDs, it behaves the way I would expect.
> What's the performance benefit on !PCID systems? And I mean systems which
> actually do not have PCID, not a PCID system with 'nopcid' on the command
> line.
Do you have something in mind for this? Basically *all* of the servers
that I have access to have PCID because they are newer than ~7 years old.
That leaves *some* Ivybridge and earlier desktops, Atoms and AMD
systems. Atoms are going to be the easiest thing to get my hands on,
but I tend to shy away from them for performance work.
next prev parent reply other threads:[~2018-03-27 16:32 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-23 17:44 [PATCH 00/11] Use global pages with PTI Dave Hansen
2018-03-23 17:44 ` [PATCH 01/11] x86/mm: factor out pageattr _PAGE_GLOBAL setting Dave Hansen
2018-03-23 17:44 ` [PATCH 02/11] x86/mm: undo double _PAGE_PSE clearing Dave Hansen
2018-03-23 17:44 ` [PATCH 03/11] x86/mm: introduce "default" kernel PTE mask Dave Hansen
2018-03-23 17:44 ` [PATCH 04/11] x86/espfix: document use of _PAGE_GLOBAL Dave Hansen
2018-03-23 17:44 ` [PATCH 05/11] x86/mm: do not auto-massage page protections Dave Hansen
2018-03-23 19:15 ` Nadav Amit
2018-03-23 19:26 ` Dave Hansen
2018-03-23 19:34 ` Nadav Amit
2018-03-23 19:38 ` Dave Hansen
2018-03-24 15:10 ` kbuild test robot
2018-03-24 15:21 ` kbuild test robot
2018-03-23 17:44 ` [PATCH 06/11] x86/mm: remove extra filtering in pageattr code Dave Hansen
2018-03-23 17:44 ` [PATCH 07/11] x86/mm: comment _PAGE_GLOBAL mystery Dave Hansen
2018-03-23 17:44 ` [PATCH 08/11] x86/mm: do not forbid _PAGE_RW before init for __ro_after_init Dave Hansen
2018-03-23 17:45 ` [PATCH 09/11] x86/pti: enable global pages for shared areas Dave Hansen
2018-03-23 19:12 ` Nadav Amit
2018-03-23 19:36 ` Dave Hansen
2018-03-23 17:45 ` [PATCH 10/11] x86/pti: clear _PAGE_GLOBAL for kernel image Dave Hansen
2018-03-23 17:45 ` [PATCH 11/11] x86/pti: leave kernel text global for !PCID Dave Hansen
2018-03-23 18:26 ` [PATCH 00/11] Use global pages with PTI Linus Torvalds
2018-03-24 0:40 ` Dave Hansen
2018-03-24 0:46 ` Linus Torvalds
2018-03-24 0:54 ` Linus Torvalds
2018-03-24 11:05 ` Ingo Molnar
2018-03-27 13:36 ` Thomas Gleixner
2018-03-27 16:32 ` Dave Hansen [this message]
2018-03-27 17:51 ` Thomas Gleixner
2018-03-27 20:07 ` Ingo Molnar
2018-03-27 20:19 ` Dave Hansen
2018-03-29 0:17 ` Dave Hansen
2018-03-30 12:09 ` Ingo Molnar
2018-03-30 12:17 ` Ingo Molnar
2018-03-30 20:26 ` Dave Hansen
2018-03-30 20:32 ` Thomas Gleixner
2018-03-30 21:40 ` Dave Hansen
2018-03-31 5:39 ` Ingo Molnar
2018-03-31 18:19 ` Dave Hansen
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