David Chinner wrote:
quoted text
> Allow lazy unmapping of vmap()d regions be taking a reference
> on each page in the region being vmap()ed. The page references
> get released after the region is vunmap()ed, thereby ensuring
> we don't leave stray mappings on freed pages that could lead to
> problems pages being reallocated with incorrect mappings
> associated with them.
>
> Tested with XFS filesystems with 64k directory blocks with
> dirstress and XFSQA.
>
> Version 3:
>   - compile on latest -git
>   

Not quite:

  CC      mm/vmalloc.o
/home/jeremy/hg/xen/paravirt/linux/mm/vmalloc.c: In function 'vm_area_alloc_pagearray':
/home/jeremy/hg/xen/paravirt/linux/mm/vmalloc.c:338: error: 'GFP_LEVEL_MASK' undeclared (first use in this function)
/home/jeremy/hg/xen/paravirt/linux/mm/vmalloc.c:338: error: (Each undeclared identifier is reported only once
/home/jeremy/hg/xen/paravirt/linux/mm/vmalloc.c:338: error: for each function it appears in.)
make[3]: *** [mm/vmalloc.o] Error 1
make[2]: *** [mm] Error 2
make[2]: *** Waiting for unfinished jobs....


GFP_RECLAM_MASK now?

J
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