Hi.
I'm trying to port the Solaris iotop script (not the complicated
ksh-iottop, but rather simple iotop) to FreeBSD.
Here's the script:
#!/usr/sbin/dtrace -s
#pragma D option quiet
BEGIN {
printf("%-6s %-20s %s\n", "PID", "COMMAND", "BYTES/SEC");
printf("------ -------------------- ---------");
last = timestamp;
}
io:::start {
@io[pid, execname] = sum(args[0]->b_bcount);
}
tick-5sec {
trunc(@io, 10);
printf("\n");
normalize(@io, (timestamp - last) / 1000000000);
printa("%-6d %-20s %@d\n", @io);
trunc(@io, 0);
last = timestamp;
}
It works fine on Solaris, but on FreeBSD I got the error
dtrace: failed to compile script ./iotop.old: line 12: b_bcount is not a
member of struct bio
I figured out that since the bio struct is mentioned, I have to use the
bio_bcount instead. Is this correct ?
Second issue - when running this modified with bio_bcount script, I get
the actual data, that seems to reflect reality, but I'm also getting
tonnes of errors like:
dtrace: error on enabled probe ID 2 (ID 56400: io:kernel::start):
invalid address (0x20) in action #4 at DIF offset 16
dtrace: error on enabled probe ID 2 (ID 56400: io:kernel::start):
invalid address (0x20) in action #4 at DIF offset 16
dtrace: error on enabled probe ID 2 (ID 56400: io:kernel::start):
invalid address (0x20) in action #4 at DIF offset 16
dtrace: error on enabled probe ID 2 (ID 56400: io:kernel::start):
invalid address (0x20) in action #4 at DIF offset 16
dtrace: error on enabled probe ID 2 (ID 56400: io:kernel::start):
invalid address (0x20) in action #4 at DIF offset 16
- and I want to ask - why. I get no errors on Solaris (and yes - the
modification may be the reason). Is it safe to ignore the errors, or
should the script be modified in some manner ?
Thanks.
Eugene.
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