Hey all -
Trying to track down a problem, I found that I wanted to understand how
long each kernel function call was taking once inside a systemcall.
so, for example, let's say, I wanted to look at fdsync() activity for a
given process, it might do something like
fdsync() entry
function a entry
function b entry
function c entry
function c return
function c entry
function c return
function b return
function b entry
function c entry
function c return
function a return
<...>
fdsync() return
Now: I'm sure someone has already solved this, so before I go working it
out myself, what I want is something that will tell me how long each
function was actually running and/or how long it was on CPU. Having both
would be of advantage, considering that there might well be some waiting
for disks etc.
Of course, the tricky part here is that I want both the running time of
that function, both with and without the running time of it's subsequent
function calls...
So, some output from this mythical script might look like:
FUNCTION Entered(ms)Returned Individual Aggregate
fdsync() entry 0000000
function a entry 0000400
function b entry 0000500
function c entry 0000600
function c return 0000800 200 200
function c entry 0001000
function c return 0001200 200 200
function b return 0001300 400 800
function b entry 0001400
function c entry 0001500
function c return 0001600 100 100
function b return 0001700 200 300
function a return 0001900 300 1500
<...>
fdsync() return
Of course, if someone has something already written that's even close to
this, it would be excellent... and being able to limit the depth or
functions we track would also be cool... ;)
Thanks for any thoughts!
Nathan.
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