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 22:05:29 -0700 [thread overview]
Message-ID: <20170430050529.GH27790@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:
> +static inline bool vma_is_dead(struct vm_area_struct *vma, unsigned int sequence)
> +{
> + int ret = RB_EMPTY_NODE(&vma->vm_rb);
> + unsigned seq = ACCESS_ONCE(vma->vm_sequence.sequence);
> +
> + /*
> + * Matches both the wmb in write_seqlock_{begin,end}() and
> + * the wmb in vma_rb_erase().
> + */
> + smp_rmb();
> +
> + return ret || seq != sequence;
> +}
Hang on, this isn't vma_is_dead(). This is vma_has_changed() (possibly
from live to dead, but also possibly grown or shrunk; see your earlier
patch).
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next prev parent reply other threads:[~2017-04-30 5:05 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
2017-04-30 5:05 ` Matthew Wilcox [this message]
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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