linux/arch/s390
Christian Borntraeger a06afe8383 KVM: s390: vsie/gmap: reduce gmap_rmap overhead
there are cases that trigger a 2nd shadow event for the same
vmaddr/raddr combination. (prefix changes, reboots, some known races)
This will increase memory usages and it will result in long latencies
when cleaning up, e.g. on shutdown. To avoid cases with a list that has
hundreds of identical raddrs we check existing entries at insert time.
As this measurably reduces the list length this will be faster than
traversing the list at shutdown time.

In the long run several places will be optimized to create less entries
and a shrinker might be necessary.

Fixes: 4be130a084 ("s390/mm: add shadow gmap support")
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20220429151526.1560-1-borntraeger@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2022-05-03 15:15:44 +02:00
..
appldata s390/appldata: use struct_size() helper 2020-06-29 16:32:34 +02:00
boot s390: remove invalid email address of Heiko Carstens 2022-02-06 23:31:29 +01:00
configs s390: enable CONFIG_HARDENED_USERCOPY in debug_defconfig 2022-04-12 11:56:08 +02:00
crypto s390: convert ".insn" encoding to instruction names 2022-03-10 15:58:17 +01:00
hypfs s390/extable: move EX_TABLE define to asm-extable.h 2022-03-08 00:33:00 +01:00
include s390: current_stack_pointer shouldn't be a function 2022-04-12 11:56:08 +02:00
kernel s390/kexec: silence -Warray-bounds warning 2022-04-07 12:36:54 +02:00
kvm KVM: s390: Fix lockdep issue in vm memop 2022-05-02 19:45:03 +02:00
lib s390: current_stack_pointer shouldn't be a function 2022-04-12 11:56:08 +02:00
mm KVM: s390: vsie/gmap: reduce gmap_rmap overhead 2022-05-03 15:15:44 +02:00
net s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
pci s390/pci: rename get_zdev_by_bus() to zdev_from_bus() 2022-03-27 22:18:40 +02:00
purgatory s390: enable KCSAN 2021-07-30 17:09:23 +02:00
tools s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
Kbuild kbuild: use more subdir- for visiting subdirectories while cleaning 2021-10-24 13:49:46 +09:00
Kconfig s390: allow to compile with z16 optimizations 2022-04-06 13:08:50 +02:00
Kconfig.debug tracing: Refactor TRACE_IRQFLAGS_SUPPORT in Kconfig 2021-08-16 11:37:21 -04:00
Makefile s390: disable -Warray-bounds 2022-04-27 12:53:07 +02:00