Re: [PATCH] filemap: add trace events for get_pages, map_pages, and fault

[Takaya Saeki]

Thank you Matthew for taking a look at this!
I fix both points and send a V2 patch.

> This needs to be cast to an loff_t before shifting.

I found that this applies to add_to_page_cache and delete_from_page_cache, too.
I could fix them too, but I didn't since it will change the max value
of those traces from %lu to %lld on 32 bit environments, which would
be a breaking change. However, let me know if you think we should fix
existing events as well.