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3467811e26
linux/drivers/block
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Steven Noonan 3467811e26 xen-blkfront: make blkif_io_lock spinlock per-device 
This patch moves the global blkif_io_lock to the per-device structure. The
spinlock seems to exists for two reasons: to disable IRQs when in the interrupt
handlers for blkfront, and to protect the blkfront VBDs when a detachment is
requested.

Having a global blkif_io_lock doesn't make sense given the use case, and it
drastically hinders performance due to contention. All VBDs with pending IOs
have to take the lock in order to get work done, which serializes everything
pretty badly.

Signed-off-by: Steven Noonan <snoonan@amazon.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-03-20 12:52:41 +01:00
..
aoe switch device_get_devnode() and ->devnode() to umode_t * 2012-01-03 22:54:55 -05:00
drbd module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
mtip32xx mtip32xx: removed the irrelevant argument of mtip_hw_submit_io() and the unused member of struct driver_data 2012-02-07 07:54:31 +01:00
paride paride/pcd: fix bool verbose module parameter. 2012-01-13 09:32:26 +10:30
xen-blkback xen/blkback: Enable blkback on HVM guests 2012-03-20 12:52:41 +01:00
amiflop.c fs: move code out of buffer.c 2012-01-03 22:54:07 -05:00
ataflop.c block: unexport DISK_EVENT_MEDIA_CHANGE for legacy/fringe drivers 2011-04-21 21:33:05 +02:00
brd.c fs: move code out of buffer.c 2012-01-03 22:54:07 -05:00
cciss_cmd.h cciss: use new doorbell-bit-5 reset method 2011-05-06 08:23:55 -06:00
cciss_scsi.c cciss: auto engage SCSI mid layer at driver load time 2011-11-16 09:21:49 +01:00
cciss_scsi.h cciss: add cciss_tape_cmds module paramter 2011-05-06 08:23:59 -06:00
cciss.c block: add and use scsi_blk_cmd_ioctl 2012-01-14 15:07:24 -08:00
cciss.h cciss: Adds simple mode functionality 2011-08-08 11:40:15 +02:00
cpqarray.c drivers/block/cpqarray.c: use pci_dev->revision 2011-09-21 10:02:13 +02:00
cpqarray.h
cryptoloop.c
DAC960.c drivers/block/DAC960: fix -Wuninitialized warning 2012-03-02 10:48:35 +01:00
DAC960.h
floppy.c floppy/scsi: fix setting of BIO flags 2012-03-05 15:49:43 -08:00
hd.c i8253: Create linux/i8253.h and use it in all 8253 related files 2011-06-09 15:01:37 +02:00
ida_cmd.h
ida_ioctl.h
Kconfig Merge git://git.infradead.org/users/willy/linux-nvme 2012-01-18 12:34:09 -08:00
loop.c loop: zero fill bio instead of return -EIO for partial read 2012-02-08 22:07:19 +01:00
Makefile Merge git://git.infradead.org/users/willy/linux-nvme 2012-01-18 12:34:09 -08:00
mg_disk.c block: switch s390 tape_block and mg_disk to elevator_change() 2010-08-23 14:02:44 +02:00
nbd.c nbd-replace-some-printk-with-dev_warn-and-dev_info-checkpatch-fixes 2011-08-19 14:48:28 +02:00
nvme.c asm-generic: architecture independent readq/writeq for 32bit environment 2012-02-21 16:47:28 -08:00
osdblk.c block: remove spurious uses of REQ_HARDBARRIER 2010-09-10 12:35:36 +02:00
pktcdvd.c switch device_get_devnode() and ->devnode() to umode_t * 2012-01-03 22:54:55 -05:00
ps3disk.c block: Fix files that are modules and hence need module.h 2011-10-31 19:31:13 -04:00
ps3vram.c Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
rbd_types.h rbd: introduce rados block device (rbd), based on libceph 2010-10-20 15:38:13 -07:00
rbd.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2012-02-02 15:47:33 -08:00
smart1,2.h fix typos 'comamnd' -> 'command' in comments 2011-02-02 11:31:21 +01:00
sunvdc.c block: Consolidate phys_segment and hw_segment limits 2010-02-26 13:58:08 +01:00
swim3.c block/swim3: Locking fixes 2011-12-12 12:42:12 +01:00
swim_asm.S
swim.c m68k/mac: cleanup forward declarations 2011-12-10 19:52:46 +01:00
sx8.c block, sx8: fix pointer math issue getting fw version 2012-03-03 19:44:39 +01:00
ub.c block: add and use scsi_blk_cmd_ioctl 2012-01-14 15:07:24 -08:00
umem.c block: remove support for bio remapping from ->make_request 2011-09-12 12:12:01 +02:00
umem.h
viodasd.c Fix common misspellings 2011-03-31 11:26:23 -03:00
virtio_blk.c block: add and use scsi_blk_cmd_ioctl 2012-01-14 15:07:24 -08:00
xd.c module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
xd.h
xen-blkfront.c xen-blkfront: make blkif_io_lock spinlock per-device 2012-03-20 12:52:41 +01:00
xsysace.c block: xsysace: Don't use NO_IRQ 2012-01-05 08:34:29 +01:00
z2ram.c drivers/block/z2ram.c: correct printing of sector_t 2010-10-28 06:15:26 -06:00