On Wed, Jun 18, 2025 at 11:33:59AM -0400, Steven Rostedt wrote:

On Wed, 18 Jun 2025 16:13:45 +0200
Peter Zijlstra [off-list ref] wrote:

quoted

quoted

+		info->cache = kzalloc(struct_size(cache, entries, UNWIND_MAX_ENTRIES),
+				      GFP_KERNEL);  

And now you're one 'long' larger than a page. Surely that's a crap size
for an allocator?

Bah, Ingo suggested to put the counter in the allocation and I didn't think
about the size going over the page. Good catch!

Since it can make one per task, it may be good to make this into a
kmemcache.

Well, the trivial solution is to make it 511 and call it a day. Don't
make things complicated if you don't have to.