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Message-ID: <20080419210010.GB1554@Krystal> Date: Sat, 19 Apr 2008 17:00:10 -0400 From: Mathieu Desnoyers <compudj@...stal.dyndns.org> To: Andi Kleen <andi@...stfloor.org> Cc: mingo@...e.hu, akpm@...l.org, "H. Peter Anvin" <hpa@...or.com>, Jeremy Fitzhardinge <jeremy@...p.org>, Steven Rostedt <rostedt@...dmis.org>, "Frank Ch. Eigler" <fche@...hat.com>, linux-kernel@...r.kernel.org Subject: Re: [RFC PATCH] x86 NMI-safe INT3 and Page Fault (v5) * Andi Kleen (andi@...stfloor.org) wrote: > Mathieu Desnoyers wrote: > > * Andi Kleen (andi@...stfloor.org) wrote: > >> Mathieu Desnoyers <compudj@...stal.dyndns.org> writes: > >>> It allows placing immediate values (and therefore optimized trace_marks) in NMI > >>> code > >> Only if all your trace_mark infrastructure is lock less. > >> > >> -Andi > >> > > > > It uses RCU-style updates and has been designed to be lockless from the > > ground up. > > Wrong. If it causes vmalloc faults it is not lockless. > > -Andi > Could you point me where vmalloc_fault accesses a data structure for which updates are protected by disabling interrupts ? I am curious. Mathieu -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 -- 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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