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Date: Sun, 25 May 2008 11:53:05 -0700 From: Arjan van de Ven <arjan@...radead.org> To: Steven Rostedt <rostedt@...dmis.org> Cc: LKML <linux-kernel@...r.kernel.org>, linux-rt-users <linux-rt-users@...r.kernel.org>, akpm@...l.org, Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>, Clark Williams <clark.williams@...il.com>, Peter Zijlstra <peterz@...radead.org>, "Luis Claudio R. Goncalves" <lclaudio@...g.org>, Gregory Haskins <ghaskins@...ell.com>, Andi Kleen <ak@...e.de>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: [PATCH] x86: enable preemption in delay On Sat, 24 May 2008 23:11:20 -0400 (EDT) Steven Rostedt <rostedt@...dmis.org> wrote: > > In git commit 35d5d08a085c56f153458c3f5d8ce24123617faf, Andrew Morton > placed preempt_disable around the entire delay due to TSC's not > working nicely on SMP. Unfortunately for those that care about > latencies this is devastating! Especially when we have callers to > mdelay(8). we used to have a WARN_ON if mdelay was called while preemptable.. maybe we should put that back in? -- 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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