Re: vmscan.c: shrink_cache() doubt

[Andrew Morton]

[e-mail] wrote:
> 
> In shrink_cache(), we have
> 
>           if (!page->buffers && (page_count(page) != 1 || !page->mapping))
>                goto page_mapped;
>           .
>           .
>           .
> page_mapped:
>           if (--max_mapped >=0)
>                continue;
> 
> Assume page->buffers == NULL and page->count == 1, then why jump to page_mapped
> if page->mapping == NULL ??
> 

These are anonymous pages - memory returned by malloc() rather
than by mmap().

Replace max_mapped with max_unfreeable and replace page_mapped
with page_unfreeable and it may make some sense.

-