From: Peter Zijlstra <peterz@infradead.org>
To: Nadav Amit <namit@vmware.com>
Cc: Nicholas Piggin <npiggin@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
"linux-csky@vger.kernel.org" <linux-csky@vger.kernel.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
linux-s390 <linux-s390@vger.kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Mel Gorman <mgorman@techsingularity.net>,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>, X86 ML <x86@kernel.org>,
Yu Zhao <yuzhao@google.com>
Subject: Re: [RFC 00/20] TLB batching consolidation and enhancements
Date: Mon, 1 Feb 2021 13:44:34 +0100 [thread overview]
Message-ID: <YBf3sl3M+j3hJRoM@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <A1589669-34AE-4E15-8358-79BAD7C72520@vmware.com>
On Sun, Jan 31, 2021 at 07:57:01AM +0000, Nadav Amit wrote:
> > On Jan 30, 2021, at 7:30 PM, Nicholas Piggin <npiggin@gmail.com> wrote:
> > I'll go through the patches a bit more closely when they all come
> > through. Sparc and powerpc of course need the arch lazy mode to get
> > per-page/pte information for operations that are not freeing pages,
> > which is what mmu gather is designed for.
>
> IIUC you mean any PTE change requires a TLB flush. Even setting up a new PTE
> where no previous PTE was set, right?
These are the HASH architectures. Their hardware doesn't walk the
page-tables, but it consults a hash-table to resolve page translations.
They _MUST_ flush the entries under the PTL to avoid ever seeing
conflicting information, which will make them really unhappy. They can
do this because they have TLBI broadcast.
There's a few more details I'm sure, but those seem to have slipped from
my mind.
next prev parent reply other threads:[~2021-02-01 12:44 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-31 0:11 [RFC 00/20] TLB batching consolidation and enhancements Nadav Amit
2021-01-31 0:11 ` [RFC 11/20] mm/tlb: remove arch-specific tlb_start/end_vma() Nadav Amit
2021-02-01 12:09 ` Peter Zijlstra
2021-02-02 6:41 ` Nicholas Piggin
2021-02-02 7:20 ` Nadav Amit
2021-02-02 9:31 ` Peter Zijlstra
2021-02-02 9:54 ` Nadav Amit
2021-02-02 11:04 ` Peter Zijlstra
2021-01-31 0:39 ` [RFC 00/20] TLB batching consolidation and enhancements Andy Lutomirski
2021-01-31 1:08 ` Nadav Amit
2021-01-31 3:30 ` Nicholas Piggin
2021-01-31 7:57 ` Nadav Amit
2021-01-31 8:14 ` Nadav Amit
2021-02-01 12:44 ` Peter Zijlstra [this message]
2021-02-02 7:14 ` Nicholas Piggin
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