AuxXxilium/linux_dsm_epyc7002
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4995f8ef9d
linux_dsm_epyc7002/drivers
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Kay Sievers 4995f8ef9d vcs: hook sysfs devices into object lifetime instead of "binding" 
During bootup performance tracing I noticed many occurrences of
vca* device creation and removal, leading to the usual userspace
uevent processing, which are, in this case, rather pointless.

A simple test showing the kernel timing (not including all the
work userspace has to do), gives us these numbers:
  $ time for i in `seq 1000`; do echo a > /dev/tty2; done
  real    0m1.142s
  user    0m0.015s
  sys     0m0.540s

If we move the hook for the vcs* driver core devices from the
tty "binding" to the vc allocation/deallocation, which is what
the vcs* devices represent, we get the following numbers:
  $ time for i in `seq 1000`; do echo a > /dev/tty2; done
  real    0m0.152s
  user    0m0.030s
  sys     0m0.072s

Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-24 16:38:26 -07:00
..
accessibility
acpi acpi: check for pxm_to_node_map overflow 2009-03-16 00:35:30 -04:00
amba amba: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:22 -07:00
ata ata_piix: add workaround for Samsung DB-P70 2009-03-13 14:56:07 -04:00
atm ATM: misplaced parentheses? 2009-02-18 17:41:38 -08:00
auxdisplay
base driver core: fix passing platform_data 2009-03-24 16:38:26 -07:00
block platform: make better use of to_platform_{device,driver}() macros 2009-03-24 16:38:24 -07:00
bluetooth
cdrom
char vcs: hook sysfs devices into object lifetime instead of "binding" 2009-03-24 16:38:26 -07:00
clocksource
connector
cpufreq Revert "[CPUFREQ] Disable sysfs ui for p4-clockmod." 2009-03-09 15:07:33 -04:00
cpuidle
crypto crypto: ixp4xx - Fix qmgr_request_queue build failure 2009-03-04 08:01:22 +08:00
dca Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-03-23 09:25:58 -07:00
dio dio: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:22 -07:00
dma dma: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:22 -07:00
edac edac: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
eisa eisa: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:22 -07:00
firewire firewire: core: Remove card from list of cards when enable fails 2009-02-01 11:17:24 +01:00
firmware Bernhard has moved 2009-02-18 15:37:56 -08:00
gpio gpio: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:23 -07:00
gpu drm: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:22 -07:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2009-03-19 14:50:15 -07:00
hwmon hwmon: (f75375s) Remove unnecessary and confusing initialization 2009-03-12 13:36:39 +01:00
i2c Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-03-03 14:12:41 -08:00
ide platform driver: fix incorrect use of 'platform_bus_type' with 'struct device_driver' 2009-03-24 16:38:25 -07:00
idle
ieee1394 Make ieee1394_init a fs-initcall 2009-02-26 10:32:31 -08:00
infiniband RDMA/nes: Don't allow userspace QPs to use STag zero 2009-03-12 16:21:41 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2009-03-02 15:43:03 -08:00
isdn platform: make better use of to_platform_{device,driver}() macros 2009-03-24 16:38:24 -07:00
leds lis3lv02d: merge with leds hp disk 2009-01-15 16:39:40 -08:00
lguest lguest: fix for CONFIG_SPARSE_IRQ=y 2009-03-09 10:06:29 +10:30
macintosh
mca mca: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:23 -07:00
md dm crypt: wait for endio to complete before destruction 2009-03-16 17:44:36 +00:00
media v4l: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:22 -07:00
memstick
message [SCSI] mpt: fix disable lsi sas to use msi as default 2009-02-22 08:51:07 -06:00
mfd mfd: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:23 -07:00
misc hpilo: new pci device 2009-02-27 16:26:22 -08:00
mmc mmc: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
mtd platform driver: fix incorrect use of 'platform_bus_type' with 'struct device_driver' 2009-03-24 16:38:25 -07:00
net platform driver: fix incorrect use of 'platform_bus_type' with 'struct device_driver' 2009-03-24 16:38:25 -07:00
nubus
of
oprofile oprofile: fix uninitialized use of struct op_entry 2009-01-17 17:26:39 +01:00
parisc parisc: sba_iommu: fix build bug when CONFIG_PARISC_AGP=y 2009-03-15 13:36:22 -07:00
parport m68k: atari - Rename "mfp" to "st_mfp" 2009-02-22 09:23:02 -08:00
pci pci: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
pcmcia platform driver: fix incorrect use of 'platform_bus_type' with 'struct device_driver' 2009-03-24 16:38:25 -07:00
platform acpi-wmi: unsigned cannot be less than 0 2009-03-16 00:38:24 -04:00
pnp
power ds2760_battery.c: fix division by zero 2009-03-12 16:20:23 -07:00
ps3 powerpc/ps3: Printing fixups for l64 to ll64 conversion drivers/ps3 2009-01-16 16:15:14 +11:00
rapidio rapidio: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
regulator leds: Fix bounds checking of wm8350->pmic.led 2009-01-30 21:50:49 +00:00
rtc rtc: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:22 -07:00
s390 s390: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
sbus sbus: Auto-load openprom module when device opened. 2009-03-13 14:30:08 -07:00
scsi scsi/m68k: Kill NCR_700_detect() warnings 2009-03-24 16:38:25 -07:00
serial serial: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
sh sh: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
sn
spi spi: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
ssb
staging Staging: benet: remove driver now that it is merged in drivers/net/ 2009-03-18 09:22:17 -07:00
tc tc: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:22 -07:00
telephony
thermal
uio UIO: Take offset into account when determining number of pages that can be mapped 2009-03-24 16:38:25 -07:00
usb USB: FHCI: use dev_name() in place of bus_id. 2009-03-24 16:38:23 -07:00
uwb uwb: lock rc->rsvs_lock with spin_lock_bh() 2009-01-23 12:57:20 +00:00
video platform driver: fix incorrect use of 'platform_bus_type' with 'struct device_driver' 2009-03-24 16:38:25 -07:00
virtio virtio-pci: do not oops on config change if driver not loaded 2009-02-02 19:17:56 -08:00
w1 drivers/w1/masters/w1-gpio.c: fix read_bit() 2009-03-12 16:20:23 -07:00
watchdog platform driver: fix incorrect use of 'platform_bus_type' with 'struct device_driver' 2009-03-24 16:38:25 -07:00
xen PM: Split up sysdev_[suspend|resume] from device_power_[down|up] 2009-02-22 10:33:44 -08:00
zorro zorro: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:21 -07:00
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