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From: Nadav Amit <namit@vmware.com>
To: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.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>,
	LKML <linux-kernel@vger.kernel.org>,
	Linux-MM <linux-mm@kvack.org>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	linux-s390 <linux-s390@vger.kernel.org>,
	Andy Lutomirski <luto@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Will Deacon <will@kernel.org>, X86 ML <x86@kernel.org>,
	Yu Zhao <yuzhao@google.com>
Subject: Re: [RFC 11/20] mm/tlb: remove arch-specific tlb_start/end_vma()
Date: Tue, 2 Feb 2021 07:20:55 +0000	[thread overview]
Message-ID: <F1C67840-C62F-4583-8593-B621706034F6@vmware.com> (raw)
In-Reply-To: <1612247956.0a1r1yjmm3.astroid@bobo.none>

> On Feb 1, 2021, at 10:41 PM, Nicholas Piggin <npiggin@gmail.com> wrote:
> 
> Excerpts from Peter Zijlstra's message of February 1, 2021 10:09 pm:
>> I also don't think AGRESSIVE_FLUSH_BATCHING quite captures what it does.
>> How about:
>> 
>> 	CONFIG_MMU_GATHER_NO_PER_VMA_FLUSH
> 
> Yes please, have to have descriptive names.

Point taken. I will fix it.

> 
> I didn't quite see why this was much of an improvement though. Maybe 
> follow up patches take advantage of it? I didn't see how they all fit 
> together.

They do, but I realized as I said in other emails that I have a serious bug
in the deferred invalidation scheme.

Having said that, I think there is an advantage of having an explicit config
option instead of relying on whether tlb_end_vma is defined. For instance,
Arm does not define tlb_end_vma, and consequently it flushes the TLB after
each VMA. I suspect it is not intentional.



  reply	other threads:[~2021-02-02  7:21 UTC|newest]

Thread overview: 67+ 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 01/20] mm/tlb: fix fullmm semantics Nadav Amit
2021-01-31  1:02   ` Andy Lutomirski
2021-01-31  1:19     ` Nadav Amit
2021-01-31  2:57       ` Andy Lutomirski
2021-02-01  7:30         ` Nadav Amit
2021-02-01 11:36   ` Peter Zijlstra
2021-02-02  9:32     ` Nadav Amit
2021-02-02 11:00       ` Peter Zijlstra
2021-02-02 21:35         ` Nadav Amit
2021-02-03  9:44           ` Will Deacon
2021-02-04  3:20             ` Nadav Amit
2021-01-31  0:11 ` [RFC 02/20] mm/mprotect: use mmu_gather Nadav Amit
2021-01-31  0:11 ` [RFC 03/20] mm/mprotect: do not flush on permission promotion Nadav Amit
2021-01-31  1:07   ` Andy Lutomirski
2021-01-31  1:17     ` Nadav Amit
2021-01-31  2:59       ` Andy Lutomirski
     [not found]     ` <7a6de15a-a570-31f2-14d6-a8010296e694@citrix.com>
2021-02-01  5:58       ` Nadav Amit
2021-02-01 15:38         ` Andrew Cooper
2021-01-31  0:11 ` [RFC 04/20] mm/mapping_dirty_helpers: use mmu_gather Nadav Amit
2021-01-31  0:11 ` [RFC 05/20] mm/tlb: move BATCHED_UNMAP_TLB_FLUSH to tlb.h Nadav Amit
2021-01-31  0:11 ` [RFC 06/20] fs/task_mmu: use mmu_gather interface of clear-soft-dirty Nadav Amit
2021-01-31  0:11 ` [RFC 07/20] mm: move x86 tlb_gen to generic code Nadav Amit
2021-01-31 18:26   ` Andy Lutomirski
2021-01-31  0:11 ` [RFC 08/20] mm: store completed TLB generation Nadav Amit
2021-01-31 20:32   ` Andy Lutomirski
2021-02-01  7:28     ` Nadav Amit
2021-02-01 16:53       ` Andy Lutomirski
2021-02-01 11:52   ` Peter Zijlstra
2021-01-31  0:11 ` [RFC 09/20] mm: create pte/pmd_tlb_flush_pending() Nadav Amit
2021-01-31  0:11 ` [RFC 10/20] mm: add pte_to_page() 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 [this message]
2021-02-02  9:31         ` Peter Zijlstra
2021-02-02  9:54           ` Nadav Amit
2021-02-02 11:04             ` Peter Zijlstra
2021-01-31  0:11 ` [RFC 12/20] mm/tlb: save the VMA that is flushed during tlb_start_vma() Nadav Amit
2021-02-01 12:28   ` Peter Zijlstra
2021-01-31  0:11 ` [RFC 13/20] mm/tlb: introduce tlb_start_ptes() and tlb_end_ptes() Nadav Amit
2021-01-31  9:57   ` Damian Tometzki
2021-01-31 10:07   ` Damian Tometzki
2021-02-01  7:29     ` Nadav Amit
2021-02-01 13:19   ` Peter Zijlstra
2021-02-01 23:00     ` Nadav Amit
2021-01-31  0:11 ` [RFC 14/20] mm: move inc/dec_tlb_flush_pending() to mmu_gather.c Nadav Amit
2021-01-31  0:11 ` [RFC 15/20] mm: detect deferred TLB flushes in vma granularity Nadav Amit
2021-02-01 22:04   ` Nadav Amit
2021-02-02  0:14     ` Andy Lutomirski
2021-02-02 20:51       ` Nadav Amit
2021-02-04  4:35         ` Andy Lutomirski
2021-01-31  0:11 ` [RFC 16/20] mm/tlb: per-page table generation tracking Nadav Amit
2021-01-31  0:11 ` [RFC 17/20] mm/tlb: updated completed deferred TLB flush conditionally Nadav Amit
2021-01-31  0:11 ` [RFC 18/20] mm: make mm_cpumask() volatile Nadav Amit
2021-01-31  0:11 ` [RFC 19/20] lib/cpumask: introduce cpumask_atomic_or() Nadav Amit
2021-01-31  0:11 ` [RFC 20/20] mm/rmap: avoid potential races Nadav Amit
2021-08-23  8:05   ` Huang, Ying
2021-08-23 15:50     ` Nadav Amit
2021-08-24  0:36       ` Huang, Ying
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
2021-02-02  7:14       ` Nicholas Piggin

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