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Question on checking the stack
- From: Bryce <philip dot copeland at oracle dot com>
- To: systemtap at sources dot redhat dot com
- Date: Thu, 13 Oct 2005 11:44:48 +0100
- Subject: Question on checking the stack
Setting up a probe for a function is great and all but is there a way to
test how we entered the routine?
eg
0xc024d991 : generic_make_request+0xa/0x24b
0xc0145d20 : find_get_page+0x37/0x42
and
0xc024d991 : generic_make_request+0xa/0x24b
0xc024dc17 : submit_bio+0x45/0xcb
I'm not interested in EVERY time we trace into a function, only when
we've come from a different routine
is there something along the lines of this idea available?
probe kernel.function("generic_make_request") {
if (stack(1) == "submit_bio" ) { // where stack(1) was the last
routine and stack(2) was 2nd last etc
do_test/display
}
}