Re: [PATCH v4 5/7] mm: rework non-root kmem_cache lifecycle management

From: Christopher Lameter
Date: Wed May 15 2019 - 10:01:59 EST

On Tue, 14 May 2019, Roman Gushchin wrote:

> To make this possible we need to introduce a new percpu refcounter
> for non-root kmem_caches. The counter is initialized to the percpu
> mode, and is switched to atomic mode after deactivation, so we never
> shutdown an active cache. The counter is bumped for every charged page
> and also for every running allocation. So the kmem_cache can't
> be released unless all allocations complete.

Increase refcounts during each allocation? Looks to be quite heavy