Re: [PATCH v2] exfat: Add ftrace support for exfat and add some tracepoints

[Matthew Wilcox]

On Tue, Jul 11, 2023 at 08:22:08PM +0800, Zehao Zhang wrote:
> Add ftrace support for exFAT file system,
> and add some tracepoints:

Why?  I don't believe these are useful.  Because if you actually had use
for them, you would have noticed that you're missing 99% of the reads
issued to the filesystem from the VFS -- through exfat_readahead(),
which you didn't instrument.

So what do you actually want to know, and why can't you get that
information already?