From: Linus Torvalds <torvalds@linux-foundation.org>
To: Andy Lutomirski <luto@kernel.org>
Cc: X86 ML <x86@kernel.org>, Borislav Petkov <bpetkov@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Nadav Amit <nadav.amit@gmail.com>, Rik van Riel <riel@redhat.com>
Subject: Re: [RFC 01/11] x86/ldt: Simplify LDT switching logic
Date: Mon, 5 Jun 2017 15:40:29 -0700 [thread overview]
Message-ID: <CA+55aFwrCep+F8zV-fK5ufiDRX+N9yTcHMsyR-JhvFeoD-1LYg@mail.gmail.com> (raw)
In-Reply-To: <a5eb3dead15bcb36732bb5b655ef4ebe23cf4aa3.1496701658.git.luto@kernel.org>
On Mon, Jun 5, 2017 at 3:36 PM, Andy Lutomirski <luto@kernel.org> wrote:
> We used to switch the LDT if the prev and next mms' LDTs didn't
> match.
I think the "LDT didn't match" was really just a simpler and more
efficient way to say "they weren't both NULL".
I think you actually broke that optimization, and it now does *two*
tests instead of just one.
Linus
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next prev parent reply other threads:[~2017-06-05 22:40 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-05 22:36 [RFC 00/11] PCID and improved laziness Andy Lutomirski
2017-06-05 22:36 ` [RFC 01/11] x86/ldt: Simplify LDT switching logic Andy Lutomirski
2017-06-05 22:40 ` Linus Torvalds [this message]
2017-06-05 22:44 ` Andy Lutomirski
2017-06-05 22:51 ` Linus Torvalds
2017-06-05 22:36 ` [RFC 02/11] x86/mm: Remove reset_lazy_tlbstate() Andy Lutomirski
2017-06-05 22:36 ` [RFC 03/11] x86/mm: Give each mm TLB flush generation a unique ID Andy Lutomirski
2017-06-05 22:36 ` [RFC 04/11] x86/mm: Track the TLB's tlb_gen and update the flushing algorithm Andy Lutomirski
2017-06-06 5:03 ` Nadav Amit
2017-06-06 22:45 ` Andy Lutomirski
2017-06-05 22:36 ` [RFC 05/11] x86/mm: Rework lazy TLB mode and TLB freshness tracking Andy Lutomirski
2017-06-06 1:39 ` Nadav Amit
2017-06-06 21:23 ` Andy Lutomirski
2017-06-06 19:11 ` Rik van Riel
2017-06-06 21:34 ` Andy Lutomirski
2017-06-07 3:33 ` Rik van Riel
2017-06-07 4:54 ` Andy Lutomirski
2017-06-07 5:11 ` Andy Lutomirski
2017-06-05 22:36 ` [RFC 06/11] x86/mm: Stop calling leave_mm() in idle code Andy Lutomirski
2017-06-05 22:36 ` [RFC 07/11] x86/mm: Disable PCID on 32-bit kernels Andy Lutomirski
2017-06-05 22:36 ` [RFC 08/11] x86/mm: Add nopcid to turn off PCID Andy Lutomirski
2017-06-06 3:22 ` Andi Kleen
2017-06-14 4:52 ` Andy Lutomirski
2017-06-14 9:51 ` Borislav Petkov
2017-06-05 22:36 ` [RFC 09/11] x86/mm: Teach CR3 readers about PCID Andy Lutomirski
2017-06-05 22:36 ` [RFC 10/11] x86/mm: Enable CR4.PCIDE on supported systems Andy Lutomirski
2017-06-06 21:31 ` Boris Ostrovsky
2017-06-06 21:35 ` Andy Lutomirski
2017-06-06 21:48 ` Boris Ostrovsky
2017-06-06 21:54 ` Andy Lutomirski
2017-06-05 22:36 ` [RFC 11/11] x86/mm: Try to preserve old TLB entries using PCID Andy Lutomirski
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