Jens Axboe 1429d7c946 blk-mq: switch ctx pending map to the sparser blk_align_bitmap ...

Each hardware queue has a bitmap of software queues with pending
requests. When new IO is queued on a software queue, the bit is
set, and when IO is pruned on a hardware queue run, the bit is
cleared. This causes a lot of traffic. Switch this from the regular
BITS_PER_LONG bitmap to a sparser layout, similarly to what was
done for blk-mq tagging.

20% performance increase was observed for single threaded IO, and
about 15% performanc increase on multiple threads driving the
same device.

Signed-off-by: Jens Axboe <axboe@fb.com>

2014-05-19 11:02:47 -06:00

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acpi

Merge tag 'iommu-updates-v3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

2014-04-05 18:46:26 -07:00

asm-generic

Merge tag 'llvmlinux-for-v3.15' of git://git.linuxfoundation.org/llvmlinux/kernel

2014-04-12 17:00:40 -07:00

clocksource

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crypto

crypto: export NULL algorithms defines

2014-03-21 21:54:26 +08:00

drm

Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-04-11 12:04:15 -07:00

dt-bindings

Merge tag 'clk-for-linus-3.15' of git://git.linaro.org/people/mike.turquette/linux

2014-04-05 18:39:18 -07:00

keys

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kvm

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linux

blk-mq: switch ctx pending map to the sparser blk_align_bitmap

2014-05-19 11:02:47 -06:00

math-emu

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media

[media] rc-core: remove generic scancode filter

2014-04-06 11:30:29 -03:00

memory

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misc

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net

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2014-04-12 17:31:22 -07:00

pcmcia

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ras

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rdma

Merge branches 'core', 'cxgb4', 'ip-roce', 'iser', 'misc', 'mlx4', 'nes', 'ocrdma', 'qib', 'sgwrapper', 'srp' and 'usnic' into for-next

2014-04-03 08:30:17 -07:00

rxrpc

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scsi

scsi: Make sure cmd_flags are 64-bit

2014-04-09 20:26:20 -06:00

sound

ALSA: cs8427: separate HW initialization

2014-04-03 14:59:48 +02:00

target

target/sbc: Add sbc_dif_read_strip software emulation

2014-04-07 01:48:57 -07:00

trace

Merge tag 'trace-3.15-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2014-04-12 13:06:10 -07:00

uapi

Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media

2014-04-12 16:18:17 -07:00

video

Merge tag 'fbdev-omap-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux

2014-04-07 10:47:51 -07:00

xen

xen/acpi-processor: fix enabling interrupts on syscore_resume

2014-03-18 14:40:20 +00:00

Kbuild

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