From: Matthew Wilcox <willy@infradead.org>
To: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Cc: paulmck@linux.vnet.ibm.com, peterz@infradead.org,
akpm@linux-foundation.org, kirill@shutemov.name,
ak@linux.intel.com, mhocko@kernel.org, dave@stgolabs.net,
jack@suse.cz, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
haren@linux.vnet.ibm.com, khandual@linux.vnet.ibm.com,
npiggin@gmail.com, bsingharora@gmail.com
Subject: Re: [RFC v3 05/17] RCU free VMAs
Date: Sat, 29 Apr 2017 21:57:06 -0700 [thread overview]
Message-ID: <20170430045706.GG27790@bombadil.infradead.org> (raw)
In-Reply-To: <1493308376-23851-6-git-send-email-ldufour@linux.vnet.ibm.com>
On Thu, Apr 27, 2017 at 05:52:44PM +0200, Laurent Dufour wrote:
> @@ -359,6 +359,7 @@ struct vm_area_struct {
> #endif
> struct vm_userfaultfd_ctx vm_userfaultfd_ctx;
> seqcount_t vm_sequence;
> + struct rcu_head vm_rcu_head;
> };
>
> struct core_thread {
It doesn't look like we examine the contents of the VMA until after we've
checked that the seqlock is good, so we should be able to union virtually
any entry in the VMA with the vm_rcu_head. vm_next, vm_prev, perhaps?
Or anon_vma_chain since a list_head is the same size as an rcu_head.
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next prev parent reply other threads:[~2017-04-30 4:57 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-27 15:52 [RFC v3 00/17] Speculative page faults Laurent Dufour
2017-04-27 15:52 ` [RFC v3 01/17] mm: Dont assume page-table invariance during faults Laurent Dufour
2017-04-27 15:52 ` [RFC v3 02/17] mm: Prepare for FAULT_FLAG_SPECULATIVE Laurent Dufour
2017-04-27 15:52 ` [RFC v3 03/17] mm: Introduce pte_spinlock Laurent Dufour
2017-04-30 4:47 ` Matthew Wilcox
2017-05-03 13:01 ` Laurent Dufour
2017-04-27 15:52 ` [RFC v3 04/17] mm: VMA sequence count Laurent Dufour
2017-04-27 15:52 ` [RFC v3 05/17] RCU free VMAs Laurent Dufour
2017-04-27 18:28 ` Paul E. McKenney
2017-04-30 4:57 ` Matthew Wilcox [this message]
2017-04-30 5:05 ` Matthew Wilcox
2017-05-03 7:23 ` Laurent Dufour
2017-04-27 15:52 ` [RFC v3 06/17] mm: Provide speculative fault infrastructure Laurent Dufour
2017-04-27 15:52 ` [RFC v3 07/17] mm,x86: Add speculative pagefault handling Laurent Dufour
2017-04-27 15:52 ` [RFC v3 08/17] mm/spf: Try spin lock in speculative path Laurent Dufour
2017-04-27 15:52 ` [RFC v3 09/17] mm/spf: Fix fe.sequence init in __handle_mm_fault() Laurent Dufour
2017-04-27 15:52 ` [RFC v3 10/17] mm/spf: don't set fault entry's fields if locking failed Laurent Dufour
2017-04-27 15:52 ` [RFC v3 11/17] mm/spf; fix lock dependency against mapping->i_mmap_rwsem Laurent Dufour
2017-04-27 15:52 ` [RFC v3 12/17] mm/spf: Protect changes to vm_flags Laurent Dufour
2017-04-27 15:52 ` [RFC v3 13/17] mm/spf Protect vm_policy's changes against speculative pf Laurent Dufour
2017-04-27 15:52 ` [RFC v3 14/17] x86/mm: Update the handle_speculative_fault's path Laurent Dufour
2017-04-27 15:52 ` [RFC v3 15/17] mm/spf: Add check on the VMA's flags Laurent Dufour
2017-04-27 15:52 ` [RFC v3 16/17] mm: protect madvise vs speculative pf Laurent Dufour
2017-04-27 15:52 ` [RFC v3 17/17] mm/spf: protect mremap() against " Laurent Dufour
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