Hi Leo,
On 06/10/2021 10:51, Leo Yan wrote:
On Wed, Oct 06, 2021 at 10:35:20AM +0100, German Gomez wrote:
[...]
So simply say, I think the head pointer monotonically increasing is the right thing to do in Arm SPE driver.
I will talk to James about how we can proceed on this.
Thanks!
I took this offline with James and, though it looks possible to patch the SPE driver to have a monotonically increasing head pointer in order to simplify the handling in the perf tool, it could be a breaking change for users of the perf_event_open syscall that currently rely on the way it works now.
An alternative way we considered to simplify the patch is to change the logic inside the find_snapshot callback so that it records the entire contents of the aux buffer every time.
What do you think?
Many thanks, German