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Date: Mon, 12 Mar 2007 12:19:45 +0100 From: Thomas Gleixner <tglx@...utronix.de> To: Ingo Molnar <mingo@...e.hu> Cc: Nick Piggin <npiggin@...e.de>, Roland McGrath <roland@...hat.com>, akpm@...ux-foundation.org, mm-commits@...r.kernel.org, drepper@...hat.com, oleg@...sign.ru, sebastien.dugue@...l.net, linux-kernel@...r.kernel.org Subject: Re: [patch] change futex_wait() to hrtimers On Mon, 2007-03-12 at 12:02 +0100, Ingo Molnar wrote: > > Well I did convert futex_wait to an absolute timeout based version in > > the subsequent incremental patch. I think that is OK? > > it still has the rounding artifacts: using timer_list there is no way to > do a precise long sleep based on many small sleeps. > > even if this means more work for you (i'm sorry about that!) i'm quite > sure we should take Sebastien's hrtimers based implementation of > futex_wait(), and use the nanosleep method to restart it. There's no > point in further tweaking the imprecise approach: whenever some timeout > needs to be restarted, it's a candidate for hrtimers. > > until then, glibc already handles timeouts and restarts it manually. This also allows us to add a seperate absolute time bases futex op, which allows to remove the conversion of abstime to reltime in glibc. tglx - 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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