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SubjectRe: [PATCH v4 2/2] mm: avoid slub allocation while holding list_lock
On Sat, 9 Nov 2019, Yu Zhao wrote:

> > struct page *page, *h;
> > + unsigned long *map = bitmap_alloc(oo_objects(s->max), GFP_KERNEL);
> > +
> > + if (!map)
> > + return;
>
> What would happen if we are trying to allocate from the slab that is
> being shut down? And shouldn't the allocation be conditional (i.e.,
> only when CONFIG_SLUB_DEBUG=y)?

Kmalloc slabs are never shut down.

The allocation does not hurt and CONFIG_SLUB_DEBUG is on in most
configurations.


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