Messages in this thread | | | Subject | Re: [PATCHv2 2/2] tracing,mm - add kernel pagefault tracepoint for x86 & x86_64 | From | Steven Rostedt <> | Date | Mon, 15 Nov 2010 10:04:18 -0500 |
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On Mon, 2010-11-15 at 15:54 +0100, Frederic Weisbecker wrote: > On Mon, Nov 15, 2010 at 03:06:33PM +0100, Andi Kleen wrote:
> > For tracing the whole page fault me think it's better to have > > a generalized exception tracer with a filter on page fault. > > > You're right. A tracepoint in handle_mm_fault() would be perhaps > better. It should catch most tracepoints the users are interested > in. On the other hand we may miss part of the page fault > latency, like the mmap_sem contention. This can be measured using > lock events though. > > But I'm probably missing other important things.
I would have the general exception handler as a tracepoint that would have a "stable tracepoint" hook to it. That is, when enabling it as a infield debugging tracepoint, we would get the "raw tracepoint", but the stable tracepoint would massage it into different general types of exceptions, and the code there would do the filtering.
-- Steve
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