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From: Joel Fernandes <email@example.com> To: "Paul E. McKenney" <firstname.lastname@example.org> Cc: email@example.com, firstname.lastname@example.org, Josh Triplett <email@example.com>, Steven Rostedt <firstname.lastname@example.org>, Mathieu Desnoyers <email@example.com>, Lai Jiangshan <firstname.lastname@example.org>, Andrea Parri <email@example.com>, Jonathan Corbet <firstname.lastname@example.org>, email@example.com Subject: Re: [PATCH] doc/rcu: Correct field_count field naming in examples Date: Sun, 12 May 2019 23:43:05 -0400 [thread overview] Message-ID: <20190513034305.GB96252@google.com> (raw) In-Reply-To: <20190508181638.GY3923@linux.ibm.com> On Wed, May 08, 2019 at 11:16:38AM -0700, Paul E. McKenney wrote: [snip] > > The other example could be dentry look up which uses seqlocks for the > > RCU-walk case? But that could be too complex. This is also something I first > > learnt from the paper and then the excellent path-lookup.rst document in > > kernel sources. > > This is a great example, but it would need serious simplification for > use in the Documentation/RCU directory. Note that dcache uses it to > gain very limited and targeted consistency -- only a few types of updates > acquire the write-side of that seqlock. > > Might be quite worthwhile to have a simplified example, though! > Perhaps a trivial hash table where write-side sequence lock is acquired > only when moving an element from one chain to another? Here you meant "moving from one chain to another" in the case of hashtable-resizing right? I could not think of another reason why an element is moved between 2 hash chains. I just finished reading the main parts of Josh's relativistic hashtable paper  and it is very cool indeed. The whole wait-for-readers application for hashtable expansion is so well thought. I am planning to go over more papers and code and can certainly update this example with a read-mostly hashtable example as well as you are suggesting. :-)  https://www.usenix.org/legacy/event/atc11/tech/final_files/Triplett.pdf thanks, - Joel
next prev parent reply other threads:[~2019-05-13 3:43 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-05-05 2:03 [PATCH] doc/rcu: Correct field_count field naming in examples Joel Fernandes (Google) 2019-05-07 0:04 ` Paul E. McKenney 2019-05-08 16:26 ` Joel Fernandes 2019-05-08 18:16 ` Paul E. McKenney 2019-05-11 22:11 ` Andrea Parri 2019-05-12 0:41 ` Paul E. McKenney 2019-05-12 1:09 ` Andrea Parri 2019-05-13 3:43 ` Joel Fernandes [this message] 2019-05-14 22:13 ` Paul E. McKenney 2019-05-25 10:07 ` Joel Fernandes
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