Vlastimil Babka 213980c0f2 mm, mempolicy: simplify rebinding mempolicies when updating cpusets ... Commit c0ff7453bb ("cpuset,mm: fix no node to alloc memory when changing cpuset's mems") has introduced a two-step protocol when rebinding task's mempolicy due to cpuset update, in order to avoid a parallel allocation seeing an empty effective nodemask and failing. Later, commit cc9a6c8776 ("cpuset: mm: reduce large amounts of memory barrier related damage v3") introduced a seqlock protection and removed the synchronization point between the two update steps. At that point (or perhaps later), the two-step rebinding became unnecessary. Currently it only makes sure that the update first adds new nodes in step 1 and then removes nodes in step 2. Without memory barriers the effects are questionable, and even then this cannot prevent a parallel zonelist iteration checking the nodemask at each step to observe all nodes as unusable for allocation. We now fully rely on the seqlock to prevent premature OOMs and allocation failures. We can thus remove the two-step update parts and simplify the code. Link: http://lkml.kernel.org/r/20170517081140.30654-5-vbabka@suse.cz Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Michal Hocko <mhocko@suse.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Dimitri Sivanich <sivanich@sgi.com> Cc: Hugh Dickins <hughd@google.com> Cc: Li Zefan <lizefan@huawei.com> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-07-06 16:24:34 -07:00
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acpi	arm64 updates for 4.13:	2017-07-05 17:09:27 -07:00
asm-generic	mm/hugetlb: allow architectures to override huge_pte_clear()	2017-07-06 16:24:34 -07:00
clocksource	…
crypto	crypto: engine - replace pr_xxx by dev_xxx	2017-06-19 14:19:54 +08:00
drm	…
dt-bindings	ARM: 64-bit DT updates	2017-07-04 14:50:59 -07:00
keys	…
kvm	…
linux	mm, mempolicy: simplify rebinding mempolicies when updating cpusets	2017-07-06 16:24:34 -07:00
math-emu	…
media	…
memory	…
misc	…
net	Merge branch 'for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2017-07-06 08:59:41 -07:00
pcmcia	…
ras	trace, ras: add ARM processor error trace event	2017-06-22 18:22:05 +01:00
rdma	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2017-07-05 11:26:35 -07:00
rxrpc	…
scsi	Merge branch 'for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata	2017-07-06 09:41:58 -07:00
soc	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2017-07-05 12:31:59 -07:00
sound	…
target	…
trace	Merge branch 'for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2017-07-06 08:59:41 -07:00
uapi	mm, mempolicy: simplify rebinding mempolicies when updating cpusets	2017-07-06 16:24:34 -07:00
video	…
xen	…