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Subject[patch,v3,repost 00/10] make I/O path allocations more numa-friendly
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Hi,

This patch set makes memory allocations for data structures used in
the I/O path more numa friendly by allocating them from the same numa
node as the storage device. I've only converted a handful of drivers
at this point. My testing is limited by the hardware I have on hand.
Using these patches, I was able to max out the bandwidth of the storage
controller when issuing I/O from any node on my 4 node system. Without
the patch, I/O from nodes remote to the storage device would suffer a
penalty ranging from 6-12%. Given my relatively low-end setup[1], I
wouldn't be surprised if others could show a more significant performance
advantage.

This is a repost of the last posting. The only changes are additional
reviewed-by/acked-by tags. I think this version is ready for inclusion.
James, would you mind taking a look?

Cheers,
Jeff

[1] LSI Megaraid SAS controller with 1GB battery-backed cache,
fronting a RAID 6 10+2. The workload I used was tuned to not
have to hit disk. Fio file attached.

--
changes from v2->v3:
- Made the numa_node Scsi_Host structure member dependent on CONFIG_NUMA
- Got rid of a GFP_ZERO I added accidentally
changes from v1->v2:
- got rid of the vfs patch, as Al pointed out some fundamental
problems with it
- credited Bart van Assche properly


Jeff Moyer (10):
scsi: add scsi_host_alloc_node
scsi: make __scsi_alloc_queue numa-aware
scsi: make scsi_alloc_sdev numa-aware
scsi: allocate scsi_cmnd-s from the device's local numa node
sd: use alloc_disk_node
ata: use scsi_host_alloc_node
megaraid_sas: use scsi_host_alloc_node
mpt2sas: use scsi_host_alloc_node
lpfc: use scsi_host_alloc_node
cciss: use blk_init_queue_node

drivers/ata/libata-scsi.c | 3 ++-
drivers/block/cciss.c | 3 ++-
drivers/scsi/hosts.c | 13 +++++++++++--
drivers/scsi/lpfc/lpfc_init.c | 10 ++++++----
drivers/scsi/megaraid/megaraid_sas_base.c | 5 +++--
drivers/scsi/mpt2sas/mpt2sas_scsih.c | 4 ++--
drivers/scsi/scsi.c | 16 ++++++++++------
drivers/scsi/scsi_lib.c | 3 ++-
drivers/scsi/scsi_scan.c | 4 ++--
drivers/scsi/sd.c | 2 +-
include/scsi/scsi_host.h | 28 ++++++++++++++++++++++++++++
11 files changed, 69 insertions(+), 22 deletions(-)


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