SNIP
On Sun, Nov 12, 2017 at 11:46 PM, Jiri Olsa <jolsa@xxxxxxxxxx> wrote:
> but you closed fd4 before openning fd5..?
Yes, that is correct. I closed fd4. The reason is by closing fd4, we
are having a total of 3 hardware breakpoints active, but we are making
the software counting in the kernel think that four TYPE_DATA
breakpoints active. The counting should have disallowed us from
creating fd5 as per the following logic in the kernel:
static int __reserve_bp_slot(struct perf_event *bp)
{
....
/* Flexible counters need to keep at least one slot */
if (slots.pinned + (!!slots.flexible) > nr_slots[type])
return -ENOSPC;
....
}
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