OpenE2K/qemu-e2k
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0c4356ba7d
qemu-e2k/hw
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Christian Schoenebeck 0c4356ba7d 9pfs: T_readdir latency optimization 
Make top half really top half and bottom half really bottom half:

Each T_readdir request handling is hopping between threads (main
I/O thread and background I/O driver threads) several times for
every individual directory entry, which sums up to huge latencies
for handling just a single T_readdir request.

Instead of doing that, collect now all required directory entries
(including all potentially required stat buffers for each entry) in
one rush on a background I/O thread from fs driver by calling the
previously added function v9fs_co_readdir_many() instead of
v9fs_co_readdir(), then assemble the entire resulting network
response message for the readdir request on main I/O thread. The
fs driver is still aborting the directory entry retrieval loop
(on the background I/O thread inside of v9fs_co_readdir_many())
as soon as it would exceed the client's requested maximum R_readdir
response size. So this will not introduce a performance penalty on
another end.

Also: No longer seek initial directory position in v9fs_readdir(),
as this is now handled (more consistently) by
v9fs_co_readdir_many() instead.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Message-Id: <c7c3d1cf4e86611538cef44897842819d9359d7a.1596012787.git.qemu_oss@crudebyte.com>
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
2020-08-12 09:17:32 +02:00
..
9pfs 9pfs: T_readdir latency optimization 2020-08-12 09:17:32 +02:00
acpi ACPI: Assert that we don't run out of the preallocated memory 2020-07-27 16:12:10 +01:00
adc
alpha sysbus: Convert to sysbus_realize() etc. with Coccinelle 2020-06-15 22:05:28 +02:00
arm hw/arm/nrf51_soc: Set system_clock_scale 2020-08-03 17:55:31 +01:00
audio audio: set default value for pcspk.iobase property 2020-07-06 17:01:11 +02:00
avr hw/avr/boot: Fix memory leak in avr_load_firmware() 2020-07-21 16:13:04 +02:00
block qom: Change object_get_canonical_path_component() not to malloc 2020-07-21 16:23:43 +02:00
char hw/char: Convert the Ibex UART to use the registerfields API 2020-07-13 17:25:37 -07:00
core hw/pci-host: save/restore pci host config register 2020-07-27 10:24:39 -04:00
cpu error: Eliminate error_propagate() with Coccinelle, part 1 2020-07-10 15:18:08 +02:00
cris sysbus: Convert to sysbus_realize() etc. with Coccinelle 2020-06-15 22:05:28 +02:00
display qxl: fix modular builds with dtrace 2020-07-21 10:56:47 +02:00
dma hw: Mark nd_table[] misuse in realize methods FIXME 2020-07-21 08:41:15 +02:00
gpio error: Eliminate error_propagate() with Coccinelle, part 1 2020-07-10 15:18:08 +02:00
hppa sysbus: Convert to sysbus_realize() etc. with Coccinelle 2020-06-15 22:05:28 +02:00
hyperv error: Avoid unnecessary error_propagate() after error_setg() 2020-07-10 15:18:08 +02:00
i2c hw/i2c: Rename i2c_create_slave() as i2c_slave_create_simple() 2020-07-16 12:30:54 -05:00
i386 hw/pci-host: save/restore pci host config register 2020-07-27 10:24:39 -04:00
ide qom: Put name parameter before value / visitor parameter 2020-07-10 15:18:08 +02:00
input hw/input/virtio-input-hid.c: Don't undef CONFIG_CURSES 2020-07-24 16:15:28 +02:00
intc hw/intc/armv7m_nvic: Provide default "reset the system" behaviour for SYSRESETREQ 2020-08-03 17:55:03 +01:00
ipack
ipmi ipmi: add SET_SENSOR_READING command 2020-07-17 11:39:46 -05:00
isa error: Eliminate error_propagate() with Coccinelle, part 1 2020-07-10 15:18:08 +02:00
lm32 sysbus: Convert to sysbus_realize() etc. with Coccinelle 2020-06-15 22:05:28 +02:00
m68k qom: Put name parameter before value / visitor parameter 2020-07-10 15:18:08 +02:00
mem qom: Change object_get_canonical_path_component() not to malloc 2020-07-21 16:23:43 +02:00
microblaze error: Eliminate error_propagate() with Coccinelle, part 1 2020-07-10 15:18:08 +02:00
mips error: Eliminate error_propagate() with Coccinelle, part 1 2020-07-10 15:18:08 +02:00
misc hw/misc/aspeed_sdmc: Fix incorrect memory size 2020-07-27 16:12:10 +01:00
moxie
net hw/net/net_tx_pkt: fix assertion failure in net_tx_pkt_add_raw_fragment() 2020-08-04 14:14:48 +08:00
nios2 hw/nios2: exit to main CPU loop only when unmasking interrupts 2020-07-13 14:36:11 +01:00
nubus
nvram hw/nvram/fw_cfg: Let fw_cfg_add_from_generator() return boolean value 2020-07-21 16:47:54 +02:00
openrisc sysbus: Convert to sysbus_realize() etc. with Coccinelle 2020-06-15 22:05:28 +02:00
pci hw/pci-host: save/restore pci host config register 2020-07-27 10:24:39 -04:00
pci-bridge sysbus: Convert to sysbus_realize() etc. with Coccinelle 2020-06-15 22:05:28 +02:00
pci-host xen: Use ERRP_GUARD() 2020-07-10 15:18:09 +02:00
pcmcia sysbus: Convert to sysbus_realize() etc. with Coccinelle 2020-06-15 22:05:28 +02:00
ppc pseries: fix kvmppc_set_fwnmi() 2020-07-27 11:09:25 +10:00
rdma
riscv hw/riscv: sifive_e: Correct debug block size 2020-07-22 09:39:46 -07:00
rtc goldfish_rtc: Fix non-atomic read behaviour of TIME_LOW/TIME_HIGH 2020-07-22 09:39:46 -07:00
rx qom: Put name parameter before value / visitor parameter 2020-07-10 15:18:08 +02:00
s390x s390x/s390-virtio-ccw: fix off-by-one in loadparm getter 2020-07-30 16:53:34 +02:00
scsi error: Avoid error_propagate() after migrate_add_blocker() 2020-07-10 15:18:08 +02:00
sd sd/milkymist-memcard: Fix format string 2020-07-24 15:03:09 +02:00
semihosting semihosting: don't send the trailing '\0' 2020-07-27 09:40:08 +01:00
sh4 hw/sh4: Extract timer definitions to 'hw/timer/tmu012.h' 2020-06-22 18:37:12 +02:00
smbios error: Eliminate error_propagate() with Coccinelle, part 1 2020-07-10 15:18:08 +02:00
sparc qom: Put name parameter before value / visitor parameter 2020-07-10 15:18:08 +02:00
sparc64 qom: Put name parameter before value / visitor parameter 2020-07-10 15:18:08 +02:00
ssi ssi: Add ssi_realize_and_unref() 2020-07-03 16:59:44 +01:00
timer hw/timer/imx_epit: Avoid assertion when CR.SWR is written 2020-08-03 17:56:11 +01:00
tpm tpm: tpm_spapr: Exit on TPM backend failures 2020-07-15 14:57:33 -04:00
tricore
unicore32 hw/unicore32/puv3: Use qemu_log_mask(ERROR) instead of debug printf() 2020-06-09 19:01:56 +02:00
usb hw: Only compile the usb-dwc2 controller if it is really needed 2020-07-24 16:15:28 +02:00
vfio vfio: fix use-after-free in display 2020-07-16 10:20:12 +02:00
virtio virtio-mem: Correct format specifier mismatch for RISC-V 2020-08-04 11:48:17 -04:00
watchdog hw/watchdog/cmsdk-apb-watchdog: Add trace event for lock status 2020-06-23 11:39:47 +01:00
xen osdep.h: Always include <sys/signal.h> if it exists 2020-07-13 14:36:09 +01:00
xenpv
xtensa qdev: Make qdev_prop_set_drive() match the other helpers 2020-06-23 16:07:07 +02:00
Kconfig hw/avr: Add limited support for some Arduino boards 2020-07-11 11:02:05 +02:00
Makefile.objs vga: build qxl as module 2020-07-07 15:33:59 +02:00