fileops DTrace provider

(originally published on 01.04.2019, reviewed/rewritten on 30.03.2025, tested on Oracle Solaris 11.4 SRU 79)

Solaris 11.4 got a new fileops provider. This provider is independent from the filesystem you are using. So you can easily trace filesystem accesses with it. For example so see all filenames of accesses on your system, you can just use such a short script

fileops:::write
{
    @[args[0]->fi_name] =
    quantize(args[1]);
}
 

I have saved this script into a file called writeops. The script should show me write latencies for each file i’m writing to.

root@testbed:~# dtrace -s writeops 
dtrace: script 'writeops' matched 1 probe
 

In a second terminal window I started a echo "test" > narf. After terminating the dtrace command, it yielded the following result:

^C
narf                                              
value  ------------- Distribution ------------- count    
 8192 |                                         0        
16384 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1        
32768 |                                         0