Peter Xu <[email protected]> writes:
> Unfortunately, it was never correctly shown..
>
> This is only found when I started to look into making the blocktime feature
> more useful (so as to avoid using bpftrace, even though I'm not sure which
> one will be harder to use..).
>
> So the old dump would look like this:
>
> Postcopy vCPU Blocktime: 0-1,4,10,21,33,46,48,59
>
> Even though there're actually 40 vcpus, and the string will merge same
> elements and also sort them.
>
> To fix it, simply loop over the uint32List manually. Now it looks like:
>
> Postcopy vCPU Blocktime (ms):
> [15, 0, 0, 43, 29, 34, 36, 29, 37, 41,
> 33, 37, 45, 52, 50, 38, 40, 37, 40, 49,
> 40, 35, 35, 35, 81, 19, 18, 19, 18, 30,
> 22, 3, 0, 0, 0, 0, 0, 0, 0, 0]
>
> Cc: Dr. David Alan Gilbert <[email protected]>
> Cc: Alexey Perevalov <[email protected]>
> Cc: Markus Armbruster <[email protected]>
> Signed-off-by: Peter Xu <[email protected]>
> ---
> migration/migration-hmp-cmds.c | 23 ++++++++++++++---------
> 1 file changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c
> index 367ff6037f..3cf890b887 100644
> --- a/migration/migration-hmp-cmds.c
> +++ b/migration/migration-hmp-cmds.c
> @@ -208,15 +208,20 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict)
> }
>
> if (info->has_postcopy_vcpu_blocktime) {
> - Visitor *v;
> - char *str;
> - v = string_output_visitor_new(false, &str);
> - visit_type_uint32List(v, NULL, &info->postcopy_vcpu_blocktime,
> - &error_abort);
> - visit_complete(v, &str);
> - monitor_printf(mon, "Postcopy vCPU Blocktime: %s\n", str);
> - g_free(str);
> - visit_free(v);
> + uint32List *item = info->postcopy_vcpu_blocktime;
> + int count = 0;
> +
> + monitor_printf(mon, "Postcopy vCPU Blocktime (ms): \n [");
> +
> + while (item) {
> + monitor_printf(mon, "%"PRIu32", ", item->value);
> + item = item->next;
> + /* Each line 10 vcpu results, newline if there's more */
The list can be arbitrarily long?
> + if ((++count % 10 == 0) && item) {
> + monitor_printf(mon, "\n ");
> + }
> + }
> + monitor_printf(mon, "\b\b]\n");
Uh, backspace?
I usually do something like
sep = "";
for (...) {
printf("%s...", sep, ...);
sep = ", "
}
To add line breaks, I'd use something like
sep = ... ? ", " : ",\n";
> }
>
> out:
The less the string visitors are used, the happier I am.
