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Date: Mon, 28 Aug 2006 22:13:45 +0530 From: Dipankar Sarma <dipankar@...ibm.com> To: Arjan van de Ven <arjan@...radead.org> Cc: Paul E McKenney <paulmck@...ibm.com>, Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org Subject: Re: [PATCH 0/4] RCU: various merge candidates On Mon, Aug 28, 2006 at 06:33:09PM +0200, Arjan van de Ven wrote: > On Mon, 2006-08-28 at 21:59 +0530, Dipankar Sarma wrote: > > On Mon, Aug 28, 2006 at 06:15:48PM +0200, Arjan van de Ven wrote: > > > On Mon, 2006-08-28 at 21:38 +0530, Dipankar Sarma wrote: > > Hi Arjan, > > > > See this for a background - http://lwn.net/Articles/129511/ > > > > Primarily, rcupreempt allows read-side critical sections to > > be preempted unline classic RCU currently in mainline. It is > > also a bit more aggressive in terms of grace periods by counting > > the number of readers as opposed to periodic checks in classic > > RCU. > > > > hi, > > thanks for the explenation, this for sure explains one half of the > equation; the other half is ... "why do we not always want this"? It comes with read-side overheads for keeping track of critical sections and we need to carefully check its impact on performance over a more wide variety of workload before deciding to switch the default. See table 2 of page 10 in this paper - http://www.rdrop.com/users/paulmck/RCU/OLSrtRCU.2006.08.11a.pdf Thanks Dipankar - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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