Messages in this thread | | | Subject | Re: [PATCH 1/2] tracing/function-graph-tracer: signal interrupts entry/exit points on outpout | From | Peter Zijlstra <> | Date | Mon, 08 Dec 2008 07:19:32 +0100 |
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On Mon, 2008-12-08 at 01:54 +0100, Frederic Weisbecker wrote: > Impact: provide interrupt detection on output > > Suggested by Ingo. > If a hardirq is raised, we want it to be signaled on output, so this patch > adds two arrows on the output to find entry and exit points of a hardirq. > > Unfortunately, there are many interrupt entrypoints and these can be differents > from one arch to another. > > The approach here is one of the easiest, but doesn't shine by its scalability: > we have an array of the interrupt entrypoints names that we compare with the > symbol of the current traced function, if it matches, we draw the arrow. > > Ie: > > 1) | unlock_buffer() { > 1) | wake_up_bit() { > 1) | bit_waitqueue() { > 1) 0.872 us | __phys_addr(); > 1) 2.722 us | } > 1) | __wake_up_bit() { > 1) ==> __wake_up_bit() { > 1) | do_IRQ() {
Would be much nicer, the current proposal is lost when grepping and adds a weird visual break in the output.
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