Messages in this thread | | | From | KOSAKI Motohiro <> | Subject | Re: [ltt-dev] LTTng 0.87 improved page fault tracing | Date | Thu, 29 Jan 2009 12:42:55 +0900 (JST) |
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Hi
interesting..
> I just combined the 4 page fault handler events that were in the tracing > hot path of LTTng into 2 : > > kernel page_fault_entry > kernel page_fault_exit > > They take as parameter the combination of what was available in the > trap_entry/exit events and handle_mm_fault entry/exit events. This > should lessen the performance impact of the tracer when it's active. > I did the related modifications in LTTV 0.12.8.
Just question.
As far as I know, customer has two different requeremtn of the page fault. (1) collect number of all page fault -> if it is too large, too many interrupt decrease performance. (2) collect number of major page fault -> major page fault indicate to increase random access I/O, then, some customer want to collect major page fault (don't include minor page fault)
Is this patch fill (2) requirement?
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