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| author | David S. Miller <davem@davemloft.net> | 2015-06-09 05:06:56 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-06-09 05:06:56 +0200 |
| commit | 941742f49762ba4c908510f036b09a46c1b14513 (patch) | |
| tree | aafb7a72c2072f98889406668003234bed56df02 /kernel/events/ring_buffer.c | |
| parent | net: phy: dp83867: Fix device tree entries (diff) | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (diff) | |
| download | linux-941742f49762ba4c908510f036b09a46c1b14513.tar.xz linux-941742f49762ba4c908510f036b09a46c1b14513.zip | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'kernel/events/ring_buffer.c')
| -rw-r--r-- | kernel/events/ring_buffer.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 232f00f273cb..725c416085e3 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -493,6 +493,20 @@ int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event, rb->aux_pages[rb->aux_nr_pages] = page_address(page++); } + /* + * In overwrite mode, PMUs that don't support SG may not handle more + * than one contiguous allocation, since they rely on PMI to do double + * buffering. In this case, the entire buffer has to be one contiguous + * chunk. + */ + if ((event->pmu->capabilities & PERF_PMU_CAP_AUX_NO_SG) && + overwrite) { + struct page *page = virt_to_page(rb->aux_pages[0]); + + if (page_private(page) != max_order) + goto out; + } + rb->aux_priv = event->pmu->setup_aux(event->cpu, rb->aux_pages, nr_pages, overwrite); if (!rb->aux_priv) |