On Mon, Jan 30, 2017 at 10:49:36AM +0100, Michal Hocko wrote: > From: Michal Hocko <mho...@suse.com> > > There are many code paths opencoding kvmalloc. Let's use the helper > instead. The main difference to kvmalloc is that those users are usually > not considering all the aspects of the memory allocator. E.g. allocation > requests <= 32kB (with 4kB pages) are basically never failing and invoke > OOM killer to satisfy the allocation. This sounds too disruptive for > something that has a reasonable fallback - the vmalloc. On the other > hand those requests might fallback to vmalloc even when the memory > allocator would succeed after several more reclaim/compaction attempts > previously. There is no guarantee something like that happens though. > > This patch converts many of those places to kv[mz]alloc* helpers because > they are more conservative. > > Changes since v1 > - add kvmalloc_array - this might silently fix some overflow issues > because most users simply didn't check the overflow for the vmalloc > fallback. > > Cc: Martin Schwidefsky <schwidef...@de.ibm.com> > Cc: Heiko Carstens <heiko.carst...@de.ibm.com> > Cc: Herbert Xu <herb...@gondor.apana.org.au> > Cc: Anton Vorontsov <an...@enomsg.org> > Cc: Colin Cross <ccr...@android.com> > Cc: Kees Cook <keesc...@chromium.org> > Cc: Tony Luck <tony.l...@intel.com> > Cc: "Rafael J. Wysocki" <r...@rjwysocki.net> > Cc: Ben Skeggs <bske...@redhat.com> > Cc: Kent Overstreet <kent.overstr...@gmail.com> > Cc: Santosh Raspatur <sant...@chelsio.com> > Cc: Hariprasad S <haripra...@chelsio.com> > Cc: Yishai Hadas <yish...@mellanox.com> > Cc: Oleg Drokin <oleg.dro...@intel.com> > Cc: "Yan, Zheng" <z...@redhat.com> > Cc: Alexander Viro <v...@zeniv.linux.org.uk> > Cc: Alexei Starovoitov <a...@kernel.org> > Cc: Eric Dumazet <eric.duma...@gmail.com> > Cc: netdev@vger.kernel.org > Acked-by: Andreas Dilger <andreas.dil...@intel.com> # Lustre > Reviewed-by: Boris Ostrovsky <boris.ostrov...@oracle.com> # Xen bits > Acked-by: Christian Borntraeger <borntrae...@de.ibm.com> # KVM/s390 > Acked-by: Dan Williams <dan.j.willi...@intel.com> # nvdim > Acked-by: David Sterba <dste...@suse.com> # btrfs > Acked-by: Ilya Dryomov <idryo...@gmail.com> # Ceph > Acked-by: Tariq Toukan <tar...@mellanox.com> # mlx4 > Signed-off-by: Michal Hocko <mho...@suse.com>
Acked-by: Leon Romanovsky <leo...@mellanox.com> # mlx5
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