Laurent Vivier 3bfe57165b numa: equally distribute memory on nodes ... When there are more nodes than available memory to put the minimum allowed memory by node, all the memory is put on the last node. This is because we put (ram_size / nb_numa_nodes) & ~((1 << mc->numa_mem_align_shift) - 1); on each node, and in this case the value is 0. This is particularly true with pseries, as the memory must be aligned to 256MB. To avoid this problem, this patch uses an error diffusion algorithm [1] to distribute equally the memory on nodes. We introduce numa_auto_assign_ram() function in MachineClass to keep compatibility between machine type versions. The legacy function is used with pseries-2.9, pc-q35-2.9 and pc-i440fx-2.9 (and previous), the new one with all others. Example: qemu-system-ppc64 -S -nographic -nodefaults -monitor stdio -m 1G -smp 8 \ -numa node -numa node -numa node \ -numa node -numa node -numa node Before: (qemu) info numa 6 nodes node 0 cpus: 0 6 node 0 size: 0 MB node 1 cpus: 1 7 node 1 size: 0 MB node 2 cpus: 2 node 2 size: 0 MB node 3 cpus: 3 node 3 size: 0 MB node 4 cpus: 4 node 4 size: 0 MB node 5 cpus: 5 node 5 size: 1024 MB After: (qemu) info numa 6 nodes node 0 cpus: 0 6 node 0 size: 0 MB node 1 cpus: 1 7 node 1 size: 256 MB node 2 cpus: 2 node 2 size: 0 MB node 3 cpus: 3 node 3 size: 256 MB node 4 cpus: 4 node 4 size: 256 MB node 5 cpus: 5 node 5 size: 256 MB [1] https://en.wikipedia.org/wiki/Error_diffusion Signed-off-by: Laurent Vivier <lvivier@redhat.com> Message-Id: <20170502162955.1610-2-lvivier@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> [ehabkost: s/ram_size/size/ at numa_default_auto_assign_ram()] Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>		2017-05-11 16:08:47 -03:00
..
accel.h	accel: make configure_accelerator return void	2016-05-18 15:04:27 +03:00
arch_init.h	nios2: Add support for Nios-II R1	2017-01-24 13:10:36 -08:00
balloon.h	Clean up ill-advised or unusual header guards	2016-07-12 16:20:46 +02:00
block-backend.h	block: Add errp to b{lk,drv}_truncate()	2017-04-28 16:02:02 +02:00
blockdev.h	blockdev: Make orphaned -drive fatal	2017-02-21 13:17:45 +01:00
bt.h	Clean up header guards that don't match their file name	2016-07-12 16:19:16 +02:00
char.h	A large set of small patches. I have not included yet vhost-user-scsi,	2017-05-08 13:29:40 -04:00
cpus.h	cpus: define QEMUTimerListNotifyCB for QEMU system emulation	2017-03-14 13:28:29 +01:00
cryptodev.h	cryptodev: wrap the ready flag	2017-01-10 07:02:52 +02:00
device_tree.h	Clean up ill-advised or unusual header guards	2016-07-12 16:20:46 +02:00
dma.h	dma-helpers: explicitly pass alignment into DMA helpers	2016-10-27 16:29:13 -04:00
dump-arch.h	dump: allow target to set the physical base	2016-01-15 14:40:25 +00:00
dump.h	dump: Acquire BQL around vm_start() in dump thread	2017-05-05 12:10:00 +02:00
hax.h	target/i386: Add Intel HAX files	2017-01-19 22:07:46 +01:00
hostmem.h	hostmem: introduce host_memory_backend_mr_inited()	2017-04-20 15:22:41 -03:00
hw_accel.h	Plumb the HAXM-based hardware acceleration support	2017-01-19 22:07:46 +01:00
iothread.h	iothread: add poll-grow and poll-shrink parameters	2017-01-03 16:38:50 +00:00
kvm.h	spapr: Add ibm,processor-radix-AP-encodings to the device tree	2017-04-26 12:00:41 +10:00
kvm_int.h	kvm-all: add support for multiple address spaces	2015-07-06 17:59:43 +02:00
memory_mapping.h	Use scripts/clean-includes to drop redundant qemu/typedefs.h	2016-03-22 22:20:16 +01:00
numa.h	numa: equally distribute memory on nodes	2017-05-11 16:08:47 -03:00
os-posix.h	build: include sys/sysmacros.h for major() and minor()	2017-03-14 10:08:22 +00:00
os-win32.h	log: Add locking to large logging blocks	2016-11-01 10:29:03 -06:00
qtest.h	include: Clean up includes	2016-02-23 12:43:05 +00:00
replay.h	replay: add record/replay for audio passthrough	2017-03-01 15:11:44 +01:00
reset.h	hw: move reset handlers from vl.c to hw/core	2017-01-16 17:52:35 +01:00
rng-random.h	rng-random: rename RndRandom to RngRandom	2016-05-23 12:18:43 +05:30
rng.h	rng: switch request queue to QSIMPLEQ	2016-03-08 12:54:14 +05:30
seccomp.h	include: Clean up includes	2016-02-23 12:43:05 +00:00
sysemu.h	numa: Allow setting NUMA distance for different NUMA nodes	2017-05-11 16:08:37 -03:00
tpm.h	TPM: fix build with tpm disabled	2015-06-03 18:19:15 +02:00
tpm_backend.h	Clean up header guards that don't match their file name	2016-07-12 16:19:16 +02:00
tpm_backend_int.h	Clean up header guards that don't match their file name	2016-07-12 16:19:16 +02:00
watchdog.h	watchdog: introduction of get_watchdog_action	2016-01-27 15:34:47 +01:00
xen-mapcache.h	Clean up decorations and whitespace around header guards	2016-07-12 16:20:46 +02:00