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Date: Wed, 16 Jan 2008 21:51:57 -0500 (EST) From: Steven Rostedt <rostedt@...dmis.org> To: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> cc: john stultz <johnstul@...ibm.com>, LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Christoph Hellwig <hch@...radead.org>, Gregory Haskins <ghaskins@...ell.com>, Arnaldo Carvalho de Melo <acme@...stprotocols.net>, Thomas Gleixner <tglx@...utronix.de>, Tim Bird <tim.bird@...sony.com>, Sam Ravnborg <sam@...nborg.org>, "Frank Ch. Eigler" <fche@...hat.com>, Steven Rostedt <srostedt@...hat.com>, Paul Mackerras <paulus@...ba.org>, Daniel Walker <dwalker@...sta.com> Subject: Re: [RFC PATCH 16/22 -v2] add get_monotonic_cycles On Wed, 16 Jan 2008, Mathieu Desnoyers wrote: > > > > Yep. clocksource_get_cycles() ended up not being as useful as an helper > > function (I was hoping the arch vsyscall implementations could use it, > > but they've done too much optimization - although that may reflect a > > need up the chain to the clocksource structure). > > > > The problem with vsyscall is that we will have a hard time disabling > preemption :( Therefore, insuring that the read of the data is done in a > timely manner is hard to do. You'll have more than a hard time disabling preemption for vsyscall. We'll need to come up with a better solution then. vsyscall can not modify any kernel memory, nor can it disable preemption. -- Steve -- 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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