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/*
$1: dev_t
$2: RWBS
$3: strlen($2)
Track request order between block_io_start and block_rq_complete.
Sequence starts at 1 so 0 means "never seen". On first valid
completion, sync complete_seq to handle probe attachment races.
block_rq_complete listed first to reduce missed completion window.
*/
BEGIN {
@start_seq = (uint64)1;
@complete_seq = (uint64)0;
@out_of_order = (uint64)0;
@start_order[0] = (uint64)0;
delete(@start_order[0]);
printf("BPFTRACE_READY\n");
}
tracepoint:block:block_rq_complete
/(int64)args.dev == $1 && !strncmp(args.rwbs, str($2), $3)/
{
$expected = @start_order[args.sector];
if ($expected > 0) {
if (@complete_seq == 0) {
@complete_seq = $expected;
}
if ($expected != @complete_seq) {
printf("out_of_order: sector %llu started at seq %llu but completed at seq %llu\n",
args.sector, $expected, @complete_seq);
@out_of_order = @out_of_order + 1;
}
delete(@start_order[args.sector]);
@complete_seq = @complete_seq + 1;
}
}
tracepoint:block:block_io_start
/(int64)args.dev == $1 && !strncmp(args.rwbs, str($2), $3)/
{
@start_order[args.sector] = @start_seq;
@start_seq = @start_seq + 1;
}
END {
printf("total_start: %llu total_complete: %llu out_of_order: %llu\n",
@start_seq - 1, @complete_seq, @out_of_order);
clear(@start_order);
clear(@start_seq);
clear(@complete_seq);
clear(@out_of_order);
}
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