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dkim=pass header.d=fb.com header.s=facebook header.b=P6i+TaxJ; dmarc=pass (policy=reject) header.from=fb.com; spf=pass (imf10.hostedemail.com: domain of "prvs=99209eb3f6=guro@fb.com" designates 67.231.153.30 as permitted sender) smtp.mailfrom="prvs=99209eb3f6=guro@fb.com" X-Rspamd-Server: rspam02 X-HE-Tag: 1634162633-985642 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Oct 13, 2021 at 12:43:38PM -0700, Shakeel Butt wrote: > The commit 5c1f4e690eec ("mm/vmalloc: switch to bulk allocator in > __vmalloc_area_node()") switched to bulk page allocator for order 0 > allocation backing vmalloc. However bulk page allocator does not support > __GFP_ACCOUNT allocations and there are several users of > kvmalloc(__GFP_ACCOUNT). > > For now make __GFP_ACCOUNT allocations bypass bulk page allocator. In > future if there is workload that can be significantly improved with the > bulk page allocator with __GFP_ACCCOUNT support, we can revisit the > decision. > > Fixes: 5c1f4e690eec ("mm/vmalloc: switch to bulk allocator in __vmalloc_area_node()") > Signed-off-by: Shakeel Butt > --- > mm/page_alloc.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 668edb16446a..b3acad4615d3 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -5215,6 +5215,10 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid, > unsigned int alloc_flags = ALLOC_WMARK_LOW; > int nr_populated = 0, nr_account = 0; > > + /* Bulk allocator does not support memcg accounting. */ > + if (unlikely(gfp & __GFP_ACCOUNT)) > + goto out; > + Isn't it a bit too aggressive? How about if (WARN_ON_ONCE(gfp & __GFP_ACCOUNT)) gfp &= ~__GFP_ACCOUNT; And maybe with some explanatory message? Thanks!