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Re: Simple(?) question

Alan D. Brunelle wrote:
I'm trying to analyze something on RHEL5 GA (errata kernel), and I'm having problems getting a simple piece of histogram code to work. The following compiles & runs:

#include <linux/blkdev.h>
global rd_hist

probe kernel.function("__generic_unplug_device") {
       rd_hist <<< $q->rq.count[READ]


semantic error: unsupported type tag 19: identifier '$q' at adb-timo-hist.stp:7:14
semantic error: probe_1462 with invalid type long for operator '.' at adb-timo-hist.stp:7:20

Strangely enough I was looking into this area of systemtap on Friday, and I decided I didn't like those error messages. So, I worked on improving them a bit. Here's what the new messages will look like for your original code when I check my changes in:

semantic error: struct/union 'rq' is being accessed instead of a member of the struct/union: identifier '$q' at ../struct3.stp:3:23
semantic error: probe_1525 uses invalid operator '.' at ../struct3.stp:3:29

David Smith
Red Hat
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256.837.0057 (fax)

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