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Date: Fri, 22 Sep 2006 18:53:52 +0200 From: Ingo Molnar <mingo@...e.hu> To: Mathieu Desnoyers <compudj@...stal.dyndns.org> Cc: Martin Bligh <mbligh@...gle.com>, "Frank Ch. Eigler" <fche@...hat.com>, Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>, prasanna@...ibm.com, Andrew Morton <akpm@...l.org>, Paul Mundt <lethal@...ux-sh.org>, linux-kernel <linux-kernel@...r.kernel.org>, Jes Sorensen <jes@....com>, Tom Zanussi <zanussi@...ibm.com>, Richard J Moore <richardj_moore@...ibm.com>, Michel Dagenais <michel.dagenais@...ymtl.ca>, Christoph Hellwig <hch@...radead.org>, Greg Kroah-Hartman <gregkh@...e.de>, Thomas Gleixner <tglx@...utronix.de>, William Cohen <wcohen@...hat.com>, ltt-dev@...fik.org, systemtap@...rces.redhat.com, Alan Cox <alan@...rguk.ukuu.org.uk> Subject: Re: [PATCH] Linux Kernel Markers 0.5 for Linux 2.6.17 (with probe management) * Mathieu Desnoyers <compudj@...stal.dyndns.org> wrote: > > > Then you lose the ability to trace in-kernel minor page faults. > > > > that's wrong, minor pagefaults go through __handle_mm_fault() just as > > much. > > > > Hi Ingo, > > On a 2.6.17 kernel tree : > It seems like a shortcut path that will never call __handle_mm_fault. > This path is precisely used to handle vmalloc faults. yes, but you said "minor fault", not "vmalloc fault". minor faults are the things that happen when a task does read-after-COW or read-mmap-ed-pagecache-page, and they very much go through __handle_mm_fault(). vmalloc faults are extremely rare, x86-specific and they are a pure kernel-internal matter. (I'd never want to trace them, especially if it pushes tracepoints into every architecture's page fault handler. I implemented the initial version of them IIRC, but my memory fails precisely why. I think it was 4:4 related, but i'm unsure.) (i now realize that above you said "in-kernel minor faults" - under that you meant vmalloc faults?) Ingo - 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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