RE: [PATCH v9] eal: add seqlock

["Morten Brørup" <mb@smartsharesystems.com>]

> From: Mattias Rönnblom [mailto:mattias.ronnblom@ericsson.com]
> Sent: Wednesday, 1 June 2022 11.02
> 
> On 2022-05-31 13:52, David Marchand wrote:
> > On Mon, May 23, 2022 at 4:24 PM Mattias Rönnblom
> > <mattias.ronnblom@ericsson.com> wrote:
> >>
> >> A sequence lock (seqlock) is a synchronization primitive which
> allows
> >> for data-race free, low-overhead, high-frequency reads, suitable for
> >> data structures shared across many cores and which are updated
> >> relatively infrequently.
> >>
> >> A seqlock permits multiple parallel readers. A spinlock is used to
> >> serialize writers. In cases where there is only a single writer, or
> >> writer-writer synchronization is done by some external means, the
> >> "raw" sequence counter type (and accompanying rte_seqcount_*()
> >> functions) may be used instead.
> >>
> >> To avoid resource reclamation and other issues, the data protected
> by
> >> a seqlock is best off being self-contained (i.e., no pointers
> [except
> >> to constant data]).
> >>
> >
> > Overall, comments were addressed and the patch looks ready.
> > Last call before merging?
> >
> >
> 
> I don't have anything to add. Thanks.

Please don't hold back merging on my behalf; you may disregard my previous email regarding the v9 patch.