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percpu: allow select gfp to be passed to underlying allocators

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The prior patch added support for passing gfp flags through to the
underlying allocators. This patch allows users to pass along gfp flags
(currently only __GFP_NORETRY and __GFP_NOWARN) to the underlying
allocators. This should allow users to decide if they are ok with
failing allocations recovering in a more graceful way.

Additionally, gfp passing was done as additional flags in the previous
patch. Instead, change this to caller passed semantics. GFP_KERNEL is
also removed as the default flag. It continues to be used for internally
caused underlying percpu allocations.

V2:
Removed gfp_percpu_mask in favor of doing it inline.
Removed GFP_KERNEL as a default flag for __alloc_percpu_gfp.

Signed-off-by: Dennis Zhou <[email protected]>
Suggested-by: Daniel Borkmann <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
This commit is contained in:
Dennis Zhou 2018-02-16 12:09:58 -06:00 • committed by Tejun Heo
commit 554fef1c39
3 changed files with 10 additions and 12 deletions
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2
mm/percpu-km.c
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@ -56,7 +56,7 @@ static struct pcpu_chunk *pcpu_create_chunk(gfp_t gfp)
if (!chunk)
return NULL;
pages = alloc_pages(gfp | GFP_KERNEL, order_base_2(nr_pages));
pages = alloc_pages(gfp, order_base_2(nr_pages));
if (!pages) {
pcpu_free_chunk(chunk);
return NULL;