Re: [PATCH v3 5/5] mm: add tracepoints for zone lock

[Shakeel Butt]

On Thu, Feb 26, 2026 at 01:25:01PM -0800, Andrew Morton wrote:
> On Thu, 26 Feb 2026 11:14:52 -0800 Shakeel Butt <shakeel.butt@xxxxxxxxx> wrote:
> 
> > On Thu, Feb 26, 2026 at 06:26:22PM +0000, Dmitry Ilvokhin wrote:
> > > Add tracepoint instrumentation to zone lock acquire/release operations
> > > via the previously introduced wrappers.
> > > 
> > > The implementation follows the mmap_lock tracepoint pattern: a
> > > lightweight inline helper checks whether the tracepoint is enabled and
> > > calls into an out-of-line helper when tracing is active. When
> > > CONFIG_TRACING is disabled, helpers compile to empty inline stubs.
> > > 
> > > The fast path is unaffected when tracing is disabled.
> > > 
> > > Signed-off-by: Dmitry Ilvokhin <d@xxxxxxxxxxxx>
> > 
> > ...
> >
> > > +void __zone_lock_do_trace_start_locking(struct zone *zone)
> > > +{
> > > +	trace_zone_lock_start_locking(zone);
> > > +}
> > > +EXPORT_SYMBOL(__zone_lock_do_trace_start_locking);
> > 
> > No reason to not have these as EXPORT_SYMBOL_GPL (& below)
> 
> Do we need the exports at all?

Very good point and we don't. I think this might just be copying the mmap_lock
tracepoint wrappers which might need the exports as some drivers might be taking
the mmap_lock.

Dmitry, please confirm (test) and let us know.