diff options
Diffstat (limited to 'kernel/events/ring_buffer.c')
| -rw-r--r-- | kernel/events/ring_buffer.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index ed0859e33b2f..6e3be7a10c50 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -287,13 +287,26 @@ int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event, if (!has_aux(event)) return -ENOTSUPP; - if (event->pmu->capabilities & PERF_PMU_CAP_AUX_NO_SG) + if (event->pmu->capabilities & PERF_PMU_CAP_AUX_NO_SG) { /* * We need to start with the max_order that fits in nr_pages, * not the other way around, hence ilog2() and not get_order. */ max_order = ilog2(nr_pages); + /* + * PMU requests more than one contiguous chunks of memory + * for SW double buffering + */ + if ((event->pmu->capabilities & PERF_PMU_CAP_AUX_SW_DOUBLEBUF) && + !overwrite) { + if (!max_order) + return -EINVAL; + + max_order--; + } + } + rb->aux_pages = kzalloc_node(nr_pages * sizeof(void *), GFP_KERNEL, node); if (!rb->aux_pages) return -ENOMEM; |