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SubjectRe: [PATCH V7 1/4] mm/cma: Add PF flag to force non cma alloc
On Mon, 14 Jan 2019 15:24:33 +0530 "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> wrote:

> This patch adds PF_MEMALLOC_NOCMA which make sure any allocation in that context
> is marked non-movable and hence cannot be satisfied by CMA region.
>
> This is useful with get_user_pages_longterm where we want to take a page pin by
> migrating pages from CMA region. Marking the section PF_MEMALLOC_NOCMA ensures
> that we avoid unnecessary page migration later.
>
> ...
>
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1406,6 +1406,7 @@ extern struct pid *cad_pid;
> #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */
> #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
> #define PF_MEMSTALL 0x01000000 /* Stalled due to lack of memory */
> +#define PF_MEMALLOC_NOCMA 0x02000000 /* All allocation request will have _GFP_MOVABLE cleared */
> #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */
> #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
> #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */

This flag has been taken by PF_UMH so I moved it to 0x10000000.

And we have now run out of PF_ flags.

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