On 8/10/2020 5:41 PM, Peter Zijlstra wrote:
On Mon, Aug 10, 2020 at 02:24:23PM -0700, Kan Liang wrote:
From: Stephane Eranian <eran...@google.com>
When studying code layout, it is useful to capture the page size of the
sampled code address.
Add a new sample type for code page size.
The new sample type requires collecting the ip. The code page size can
be calculated from the IRQ-safe perf_get_page_size().
Only the generic support is covered. The large PEBS will be disabled
with this sample type.
-ENOREASON
I think the reason is similar to PERF_SAMPLE_DATA_PAGE_SIZE. For large
PEBS, the mapping could be gone for the earlier PEBS records. Invalid
page size may be retrieved. I will update the commit message.
Thanks,
Kan
