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OpenCloudOS-Kernel
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Toshiaki Makita 027b17603b vhost_net: Avoid tx vring kicks during busyloop 
Under heavy load vhost busypoll may run without suppressing
notification. For example tx zerocopy callback can push tx work while
handle_tx() is running, then busyloop exits due to vhost_has_work()
condition and enables notification but immediately reenters handle_tx()
because the pushed work was tx. In this case handle_tx() tries to
disable notification again, but when using event_idx it by design
cannot. Then busyloop will run without suppressing notification.
Another example is the case where handle_tx() tries to enable
notification but avail idx is advanced so disables it again. This case
also leads to the same situation with event_idx.

The problem is that once we enter this situation busyloop does not work
under heavy load for considerable amount of time, because notification
is likely to happen during busyloop and handle_tx() immediately enables
notification after notification happens. Specifically busyloop detects
notification by vhost_has_work() and then handle_tx() calls
vhost_enable_notify(). Because the detected work was the tx work, it
enters handle_tx(), and enters busyloop without suppression again.
This is likely to be repeated, so with event_idx we are almost not able
to suppress notification in this case.

To fix this, poll the work instead of enabling notification when
busypoll is interrupted by something. IMHO vhost_has_work() is kind of
interruption rather than a signal to completely cancel the busypoll, so
let's run busypoll after the necessary work is done.

Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2018-07-04 21:30:46 +09:00
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accessibility
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acpi acpi: Add helper for deactivating memory region 2018-06-25 21:30:12 +08:00
amba Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2018-06-06 13:49:25 -07:00
android treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
ata treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
atm Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net 2018-07-03 10:29:26 +09:00
auxdisplay treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
base PM / Domains: Rename opp_node to np 2018-06-25 09:41:37 +02:00
bcma dma-mapping updates for 4.18: 2018-06-04 10:58:12 -07:00
block for-linus-20180629 2018-06-30 10:47:46 -07:00
bluetooth bluetooth: hci_nokia: Don't include linux/unaligned/le_struct.h directly. 2018-06-17 08:38:55 +09:00
bus - Error path bug fix for overflow tests (Dan) 2018-06-12 18:28:00 -07:00
cdrom treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
char Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL 2018-06-28 10:40:47 -07:00
clk docs: Fix some broken references 2018-06-15 18:10:01 -03:00
clocksource Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-06-24 19:16:42 +08:00
connector Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2018-06-06 18:39:49 -07:00
cpufreq cpufreq: qcom-kryo: Fix error handling in probe() 2018-06-24 23:00:36 +02:00
cpuidle powerpc updates for 4.18 2018-06-07 10:23:33 -07:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2018-06-24 06:31:54 +08:00
dax dax: check for QUEUE_FLAG_DAX in bdev_dax_supported() 2018-06-28 16:06:08 -04:00
dca
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devfreq treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
dio
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dma fix a series of Documentation/ broken file name references 2018-06-15 18:10:01 -03:00
dma-buf
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edac treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
eisa
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extcon treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
firewire treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
firmware efi/libstub/tpm: Initialize efi_physical_addr_t vars to zero for mixed mode 2018-06-22 10:58:27 +02:00
fmc treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
fpga fpga: clarify that unregister functions also free 2018-05-25 18:23:56 +02:00
fsi
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gpio treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
gpu for-linus-20180629 2018-06-30 10:47:46 -07:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2018-06-20 16:42:39 +09:00
hsi
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hv treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
hwmon hwmon: (nct6775) Fix loop limit 2018-06-16 16:40:36 -07:00
hwspinlock hwspinlock updates for v4.18 2018-06-11 12:09:19 -07:00
hwtracing treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
i2c i2c: gpio: initialize SCL to HIGH again 2018-06-29 08:23:12 +02:00
ide treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
idle
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iio iio: imu: inv_mpu6050: Fix probe() failure on older ACPI based machines 2018-06-24 14:50:52 +01:00
infiniband mlx5-fixes-2018-06-26 2018-06-28 16:21:35 +09:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2018-06-27 09:16:53 -07:00
iommu - Error path bug fix for overflow tests (Dan) 2018-06-12 18:28:00 -07:00
ipack treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
irqchip irqchip/gic-v3-its: Fix reprogramming of redistributors on CPU hotplug 2018-06-22 14:22:02 +02:00
isdn Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net 2018-07-03 10:29:26 +09:00
leds treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
lightnvm for-linus-20180623 2018-06-24 06:33:54 +08:00
macintosh powerpc updates for 4.18 2018-06-07 10:23:33 -07:00
mailbox treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
mcb
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md Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md 2018-07-02 12:40:59 -07:00
media bpf: fix attach type BPF_LIRC_MODE2 dependency wrt CONFIG_CGROUP_BPF 2018-06-26 11:28:38 +02:00
memory - Error path bug fix for overflow tests (Dan) 2018-06-12 18:28:00 -07:00
memstick treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
message treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
mfd Merge branch 'i2c/for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2018-06-14 16:21:46 +09:00
misc Merge branch 'i2c/for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2018-06-14 16:21:46 +09:00
mmc treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
mtd mtd: rawnand: denali_dt: set clk_x_rate to 200 MHz unconditionally 2018-06-22 18:47:56 +02:00
mux
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net sfc: batch up RX delivery 2018-07-04 14:06:19 +09:00
nfc NFC: pn533: Fix wrong GFP flag usage 2018-06-25 21:36:45 +08:00
ntb - Error path bug fix for overflow tests (Dan) 2018-06-12 18:28:00 -07:00
nubus Char/Misc driver patches for 4.18-rc1 2018-06-05 16:20:22 -07:00
nvdimm pmem: only set QUEUE_FLAG_DAX for fsdax mode 2018-06-28 16:05:59 -04:00
nvme nvme-rdma: fix possible double free of controller async event buffer 2018-06-28 16:29:54 +02:00
nvmem treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
of - Error path bug fix for overflow tests (Dan) 2018-06-12 18:28:00 -07:00
opp PM / OPP: Update voltage in case freq == old_freq 2018-06-19 15:53:32 +05:30
oprofile treewide: Use array_size() in vmalloc() 2018-06-12 16:19:22 -07:00
parisc dma-mapping updates for 4.18: 2018-06-04 10:58:12 -07:00
parport docs: Fix some broken references 2018-06-15 18:10:01 -03:00
pci PCI: controller: Move PCI_DOMAINS selection to arch Kconfig 2018-06-26 15:37:37 -05:00
pcmcia treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
perf drivers/perf: xgene_pmu: Fix IOB SLOW PMU parser error 2018-06-18 17:48:42 +01:00
phy Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2018-06-06 18:39:49 -07:00
pinctrl pinctrl: mt7622: fix a kernel panic when pio don't work as EINT controller 2018-06-18 07:55:57 +02:00
platform fix a series of Documentation/ broken file name references 2018-06-15 18:10:01 -03:00
pnp media updates for v4.18-rc1 2018-06-07 12:34:37 -07:00
power treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
powercap treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
pps
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ps3
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ptp ptp: support DPAA FMan 1588 timer in ptp_qoriq 2018-06-26 22:15:14 +09:00
pwm pwm: Changes for v4.18-rc1 2018-06-14 16:25:43 +09:00
rapidio treewide: Use array_size() in vmalloc() 2018-06-12 16:19:22 -07:00
ras
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regulator treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
remoteproc treewide: use PHYS_ADDR_MAX to avoid type casting ULLONG_MAX 2018-06-15 07:55:25 +09:00
reset - Error path bug fix for overflow tests (Dan) 2018-06-12 18:28:00 -07:00
rpmsg rpmsg: smd: do not use mananged resources for endpoints and channels 2018-06-04 12:35:03 -07:00
rtc - New Device Support 2018-06-11 07:20:17 -07:00
s390 Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net 2018-07-03 10:29:26 +09:00
sbus fix a series of Documentation/ broken file name references 2018-06-15 18:10:01 -03:00
scsi SCSI fixes on 20180627 2018-06-27 09:42:16 -07:00
sfi
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sh treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
siox
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slimbus treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
sn
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soc Qualcomm Fixes for v4.18-rc2 2018-06-26 10:42:31 -07:00
soundwire docs: Fix more broken references 2018-06-15 18:11:26 -03:00
spi treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
spmi
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ssb
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staging Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net 2018-07-03 10:29:26 +09:00
target scsi: target: tcmu: add read length support 2018-06-18 21:02:52 -04:00
tc
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tee
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thermal - Error path bug fix for overflow tests (Dan) 2018-06-12 18:28:00 -07:00
thunderbolt
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tty vt: prevent leaking uninitialized data to userspace via /dev/vcs* 2018-06-28 21:34:39 +09:00
uio treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
usb USB-serial fixes for v4.18-rc3 2018-06-28 19:19:10 +09:00
uwb treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
vfio VFIO updates for v4.18 2018-06-12 13:11:26 -07:00
vhost vhost_net: Avoid tx vring kicks during busyloop 2018-07-04 21:30:46 +09:00
video Solve a series of broken links for files under Documentation: 2018-06-17 05:25:18 +09:00
virt treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
virtio virtio, vhost: features, fixes 2018-06-16 06:35:02 +09:00
visorbus
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vlynq
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vme
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w1 Char/Misc driver patches for 4.18-rc1 2018-06-05 16:20:22 -07:00
watchdog MIPS changes for 4.18 2018-06-12 12:56:02 -07:00
xen xen: fixes for 4.18-rc2 2018-06-23 20:44:11 +08:00
zorro - Introduce arithmetic overflow test helper functions (Rasmus) 2018-06-06 17:27:14 -07:00
Kconfig
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Makefile
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