linux/drivers/char
Theodore Ts'o 1e7f583af6 random: make /dev/urandom scalable for silly userspace programs
On a system with a 4 socket (NUMA) system where a large number of
application threads were all trying to read from /dev/urandom, this
can result in the system spending 80% of its time contending on the
global urandom spinlock.  The application should have used its own
PRNG, but let's try to help it from running, lemming-like, straight
over the locking cliff.

Reported-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2016-07-03 00:57:58 -04:00
..
agp Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2016-03-21 13:48:00 -07:00
hw_random crypto4xx: integrate ppc4xx-rng into crypto4xx 2016-04-20 17:50:02 +08:00
ipmi ipmi: Fix the I2C address extraction from SPMI tables 2016-05-16 19:49:49 -05:00
mwave
pcmcia TTY and Serial driver update for 4.7-rc1 2016-05-20 20:57:27 -07:00
tpm tpm_tis: fix build warning with tpm_tis_resume 2016-02-26 11:32:07 +02:00
xilinx_hwicap char:xilinx_hwicap:buffer_icap - change 1/0 to true/false for bool type variable in function buffer_icap_set_configuration(). 2015-06-12 16:58:33 -07:00
xillybus char: xillybus: use devm_add_action_or_reset 2016-04-30 14:04:45 -07:00
apm-emulation.c
applicom.c
applicom.h
bfin-otp.c
bsr.c
ds1302.c
ds1620.c
dsp56k.c
dtlk.c
efirtc.c drivers/char: make efirtc.c driver explicitly non-modular 2015-09-20 19:32:35 -07:00
generic_nvram.c don't open-code generic_file_llseek_size() 2015-12-09 13:00:45 -05:00
genrtc.c
hangcheck-timer.c
hpet.c hpet: Drop stale URLs 2016-02-17 09:39:56 +01:00
Kconfig char: Drop bogus dependency of DEVPORT on !M68K 2016-05-01 14:20:04 -07:00
lp.c
Makefile hwmon: Rename i8k driver to dell-smm-hwmon and move it to hwmon tree 2015-05-24 12:48:12 -07:00
mbcs.c don't open-code generic_file_llseek_size() 2015-12-09 13:00:45 -05:00
mbcs.h
mem.c drivers: char: mem: fix IS_ERROR_VALUE usage 2016-03-05 12:19:39 -08:00
misc.c char: make misc_deregister a void function 2015-08-05 10:35:49 -07:00
mmtimer.c
mspec.c tree wide: use kvfree() than conditional kfree()/vfree() 2016-01-22 17:02:18 -08:00
nsc_gpio.c
nvram.c char/nvram: set array of const as const 2016-02-08 14:57:30 -08:00
nwbutton.c char: nwbutton: avoid unused variable warning 2016-02-09 17:39:56 -08:00
nwbutton.h
nwflash.c new helpers: no_seek_end_llseek{,_size}() 2015-12-23 10:41:31 -05:00
pc8736x_gpio.c
ppdev.c Revert "ppdev: use new parport device model" 2016-03-25 09:02:13 -07:00
ps3flash.c wrappers for ->i_mutex access 2016-01-22 18:04:28 -05:00
random.c random: make /dev/urandom scalable for silly userspace programs 2016-07-03 00:57:58 -04:00
raw.c drivers: char: raw: Removed unnecessary braces 2016-02-08 14:57:30 -08:00
rtc.c
scx200_gpio.c
snsc_event.c
snsc.c drivers/char: make SGI snsc.c driver explicitly non-modular 2015-09-20 19:32:35 -07:00
snsc.h
sonypi.c
tb0219.c
tile-srom.c fs: move struct kiocb to fs.h 2015-03-25 20:28:11 -04:00
tlclk.c
toshiba.c toshiba laptop: replace ioremap_cache with ioremap 2015-08-05 17:26:00 -07:00
ttyprintk.c char: constify tty_port_operations structs 2016-02-06 23:31:08 -08:00
uv_mmtimer.c
virtio_console.c virtio_console: silence a static checker warning 2015-05-24 12:24:35 -07:00