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From: Mike Rapoport <rppt@kernel.org>
To: Michel Lespinasse <michel@lespinasse.org>
Cc: Linux-MM <linux-mm@kvack.org>,
	linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	kernel-team@fb.com, Laurent Dufour <ldufour@linux.ibm.com>,
	Jerome Glisse <jglisse@google.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Michal Hocko <mhocko@suse.com>, Vlastimil Babka <vbabka@suse.cz>,
	Davidlohr Bueso <dave@stgolabs.net>,
	Matthew Wilcox <willy@infradead.org>,
	Liam Howlett <liam.howlett@oracle.com>,
	Rik van Riel <riel@surriel.com>,
	Paul McKenney <paulmck@kernel.org>,
	Song Liu <songliubraving@fb.com>,
	Suren Baghdasaryan <surenb@google.com>,
	Minchan Kim <minchan@google.com>,
	Joel Fernandes <joelaf@google.com>,
	David Rientjes <rientjes@google.com>,
	Axel Rasmussen <axelrasmussen@google.com>,
	Andy Lutomirski <luto@kernel.org>
Subject: Re: [PATCH v2 33/35] arm64/mm: attempt speculative mm faults first
Date: Tue, 1 Feb 2022 10:58:03 +0200	[thread overview]
Message-ID: <Yfj2G3oOC6cZx0IL@kernel.org> (raw)
In-Reply-To: <20220131080729.GA785@lespinasse.org>

On Mon, Jan 31, 2022 at 12:07:29AM -0800, Michel Lespinasse wrote:
> On Sun, Jan 30, 2022 at 11:13:26AM +0200, Mike Rapoport wrote:
> > The speculative page fault implementation here (and for PowerPC as well)
> > looks very similar to x86. Can we factor it our rather than copy 3 (or
> > more) times?
> 
> In each arch, the speculative code was written along the lines of the
> existing non-speculative code, so that behavior would be unchanged
> when speculation succeeds.
> 
> Now each arch's existing, non-speculative code paths are quite similar,
> but they do have small differences as to how they implement various
> permission checks, protection keys and the like. The same small
> differences end up being reflected in the new speculative code paths.
> 
> I agree it would be nice if this code could be unified between archs,
> but IMO this should start with the existing non-speculative code -
> I don't think it would make sense to try unifying the new speculative
> code while trying to follow the behavior of the non-unified old
> non-speculative code paths...

Then maybe this unification can be done as the ground work for the
speculative page fault handling?

-- 
Sincerely yours,
Mike.

  reply	other threads:[~2022-02-01  8:59 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-28 13:09 [PATCH v2 00/35] Speculative page faults Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 01/35] mm: export dump_mm Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 02/35] mmap locking API: mmap_lock_is_contended returns a bool Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 03/35] mmap locking API: name the return values Michel Lespinasse
2022-01-31 16:17   ` Liam Howlett
2022-02-07 17:39     ` Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 04/35] do_anonymous_page: use update_mmu_tlb() Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 05/35] do_anonymous_page: reduce code duplication Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 06/35] mm: introduce CONFIG_SPECULATIVE_PAGE_FAULT Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 07/35] x86/mm: define ARCH_SUPPORTS_SPECULATIVE_PAGE_FAULT Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 08/35] mm: add FAULT_FLAG_SPECULATIVE flag Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 09/35] mm: add do_handle_mm_fault() Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 10/35] mm: add per-mm mmap sequence counter for speculative page fault handling Michel Lespinasse
2022-08-25 11:23   ` Pavan Kondeti
2022-01-28 13:09 ` [PATCH v2 11/35] mm: rcu safe vma freeing Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 12/35] mm: separate mmap locked assertion from find_vma Michel Lespinasse
2022-01-29  0:08   ` kernel test robot
2022-01-29  0:33     ` Michel Lespinasse
2022-01-31 14:44   ` Matthew Wilcox
2022-02-04 22:41     ` Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 13/35] x86/mm: attempt speculative mm faults first Michel Lespinasse
2022-02-01 17:16   ` Liam Howlett
2022-02-07 17:39     ` Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 14/35] mm: add speculative_page_walk_begin() and speculative_page_walk_end() Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 15/35] mm: refactor __handle_mm_fault() / handle_pte_fault() Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 16/35] mm: implement speculative handling in __handle_mm_fault() Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 17/35] mm: add pte_map_lock() and pte_spinlock() Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 18/35] mm: implement speculative handling in do_anonymous_page() Michel Lespinasse
2022-01-28 21:03   ` kernel test robot
2022-01-28 22:08     ` Michel Lespinasse
2022-01-30  2:54   ` [mm] fa5331bae2: canonical_address#:#[##] kernel test robot
2022-01-30  5:08     ` Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 19/35] mm: enable speculative fault handling through do_anonymous_page() Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 20/35] mm: implement speculative handling in do_numa_page() Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 21/35] mm: enable speculative fault " Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 22/35] percpu-rwsem: enable percpu_sem destruction in atomic context Michel Lespinasse
     [not found]   ` <20220129121319.3593-1-hdanton@sina.com>
2022-01-31 18:04     ` Suren Baghdasaryan
     [not found]       ` <20220201020958.3720-1-hdanton@sina.com>
2022-02-07 19:31         ` Suren Baghdasaryan
     [not found]           ` <20220208002059.2670-1-hdanton@sina.com>
2022-02-08  1:31             ` Suren Baghdasaryan
2022-01-28 13:09 ` [PATCH v2 23/35] mm: add mmu_notifier_lock Michel Lespinasse
2022-07-27  7:34   ` Pavan Kondeti
2022-07-27 20:30     ` Suren Baghdasaryan
2022-01-28 13:09 ` [PATCH v2 24/35] mm: write lock mmu_notifier_lock when registering mmu notifiers Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 25/35] mm: add mmu_notifier_trylock() and mmu_notifier_unlock() Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 26/35] mm: implement speculative handling in wp_page_copy() Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 27/35] mm: implement and enable speculative fault handling in handle_pte_fault() Michel Lespinasse
2022-01-28 13:09 ` [PATCH v2 28/35] mm: disable speculative faults for single threaded user space Michel Lespinasse
2022-01-28 13:10 ` [PATCH v2 29/35] mm: disable rcu safe vma freeing " Michel Lespinasse
2022-01-28 13:10 ` [PATCH v2 30/35] mm: create new include/linux/vm_event.h header file Michel Lespinasse
2022-01-28 13:10 ` [PATCH v2 31/35] mm: anon spf statistics Michel Lespinasse
2022-01-28 13:10 ` [PATCH v2 32/35] arm64/mm: define ARCH_SUPPORTS_SPECULATIVE_PAGE_FAULT Michel Lespinasse
2022-01-28 13:10 ` [PATCH v2 33/35] arm64/mm: attempt speculative mm faults first Michel Lespinasse
2022-01-30  9:13   ` Mike Rapoport
2022-01-31  8:07     ` Michel Lespinasse
2022-02-01  8:58       ` Mike Rapoport [this message]
2022-02-07 17:39         ` Michel Lespinasse
2022-02-08  9:07           ` Mike Rapoport
2022-01-28 13:10 ` [PATCH v2 34/35] powerpc/mm: define ARCH_SUPPORTS_SPECULATIVE_PAGE_FAULT Michel Lespinasse
2022-01-28 13:10 ` [PATCH v2 35/35] powerpc/mm: attempt speculative mm faults first Michel Lespinasse
2022-01-31  9:56 ` [PATCH v2 00/35] Speculative page faults David Hildenbrand
2022-01-31 17:00   ` Suren Baghdasaryan
2022-02-01  1:14 ` Andrew Morton
2022-02-01  2:20   ` Matthew Wilcox
2022-02-07 17:39     ` Michel Lespinasse
2022-02-01 17:17   ` Sebastian Andrzej Siewior
2022-02-23 16:11 ` Mel Gorman
2022-03-08  5:37   ` Suren Baghdasaryan

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