On Mon, Dec 08 2008, Jan Blunck wrote:
> When running
>
> blktrace -d /dev/sda -o - | ./blkparse -i -
>
> Only a few traces are actually dumped to stdout. Most of the traces are
> stored up and printed only after hitting ^C by forcing show_entries_rb() to
> print them out. I noticed that once pci->smallest_seq_read is zero
> check_sequence always returns 1:
>
> static int check_sequence(struct per_dev_info *pdi, struct trace *t, int
> force)
> {
> ...
>
> if (expected_sequence < pci->smallest_seq_read) {
> __t = trace_rb_find_last(pdi, pci, expected_sequence);
> if (!__t)
> goto skip;
>
> __put_trace_last(pdi, __t);
> return 0;
> } else if (!force) {
> return 1;
>
> ...
> }
>
> Here is a patch to fix this. It uses a global variable to keep track of the
> smallest sequence read yet on any cpu.
Shouldn't this be stored in the per-device info - IOW, the smallest
sequence read yet on this device on any CPU?
--
Jens Axboe
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