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Date: Fri, 17 Aug 2007 11:53:42 +0800 From: Herbert Xu <herbert@...dor.apana.org.au> To: Paul Mackerras <paulus@...ba.org> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Christoph Lameter <clameter@....com>, Chris Snook <csnook@...hat.com>, Ilpo J?rvinen <ilpo.jarvinen@...sinki.fi>, Satyam Sharma <satyam@...radead.org>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Stefan Richter <stefanr@...6.in-berlin.de>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org, Netdev <netdev@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, ak@...e.de, heiko.carstens@...ibm.com, David Miller <davem@...emloft.net>, schwidefsky@...ibm.com, wensong@...ux-vs.org, horms@...ge.net.au, wjiang@...ilience.com, cfriesen@...tel.com, zlynx@....org, rpjday@...dspring.com, jesper.juhl@...il.com, segher@...nel.crashing.org Subject: Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures On Fri, Aug 17, 2007 at 01:43:27PM +1000, Paul Mackerras wrote: > > The cost of doing so seems to me to be well down in the noise - 44 > bytes of extra kernel text on a ppc64 G5 config, and I don't believe > the extra few cycles for the occasional extra load would be measurable > (they should all hit in the L1 dcache). I don't mind if x86[-64] have > atomic_read/set be nonvolatile and find all the missing barriers, but > for now on powerpc, I think that not having to find those missing > barriers is worth the 0.00076% increase in kernel text size. BTW, the sort of missing barriers that triggered this thread aren't that subtle. It'll result in a simple lock-up if the loop condition holds upon entry. At which point it's fairly straightforward to find the culprit. Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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