Michal Hocko 6c5ab6511f mm: support __GFP_REPEAT in kvmalloc_node for >32kB ... vhost code uses __GFP_REPEAT when allocating vhost_virtqueue resp. vhost_vsock because it would really like to prefer kmalloc to the vmalloc fallback - see 23cc5a991c ("vhost-net: extend device allocation to vmalloc") for more context. Michael Tsirkin has also noted: "__GFP_REPEAT overhead is during allocation time. Using vmalloc means all accesses are slowed down. Allocation is not on data path, accesses are." The similar applies to other vhost_kvzalloc users. Let's teach kvmalloc_node to handle __GFP_REPEAT properly. There are two things to be careful about. First we should prevent from the OOM killer and so have to involve __GFP_NORETRY by default and secondly override __GFP_REPEAT for !costly order requests as the __GFP_REPEAT is ignored for !costly orders. Supporting __GFP_REPEAT like semantic for !costly request is possible it would require changes in the page allocator. This is out of scope of this patch. This patch shouldn't introduce any functional change. Link: http://lkml.kernel.org/r/20170306103032.2540-3-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Michael S. Tsirkin <mst@redhat.com> Cc: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-05-08 17:15:12 -07:00
..
Kconfig	tap: tap as an independent module	2017-02-11 20:59:41 -05:00
Kconfig.vringh	vhost: split out vringh Kconfig	2016-08-02 16:54:28 +03:00
Makefile
net.c	mm: support __GFP_REPEAT in kvmalloc_node for >32kB	2017-05-08 17:15:12 -07:00
scsi.c	vhost/scsi: silence uninitialized variable warning	2017-01-19 23:46:30 +02:00
test.c	Merge 4.8-rc5 into char-misc-next	2016-09-05 08:04:07 +02:00
test.h
vhost.c	mm: support __GFP_REPEAT in kvmalloc_node for >32kB	2017-05-08 17:15:12 -07:00
vhost.h	vhost: introduce O(1) vq metadata cache	2017-03-02 01:35:06 +02:00
vringh.c	vringh: kill off ACCESS_ONCE()	2016-12-16 00:13:36 +02:00
vsock.c	mm: support __GFP_REPEAT in kvmalloc_node for >32kB	2017-05-08 17:15:12 -07:00