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b6ee75ed4f
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David Daney b6ee75ed4f MIPS: Collect FPU emulator statistics per-CPU. 
On SMP systems, the collection of statistics can cause cache line
bouncing in the lines associated with the counters.  Also there are
races incrementing the counters on multiple CPUs.

To fix both problems, we collect the statistics in per-CPU variables,
and add them up in the debugfs read operation.

As a test I ran the LTP float_bessel test on a 12 CPU Octeon system.

Without CONFIG_DEBUG_FS :             2602 seconds.
With CONFIG_DEBUG_FS:                 2640 seconds.
With non-cpu-local atomic statistics: 14569 seconds.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17 01:57:08 +00:00
..
alchemy MIPS: Alchemy: Fix hang with high-frequency edge interrupts 2009-11-02 12:00:08 +01:00
ar7 MIPS: AR7: register watchdog device only if enabled in hw configuration 2009-11-02 12:00:03 +01:00
basler/excite MIPS: Excite: Get rid of BKL. 2009-09-30 21:47:01 +02:00
bcm47xx MIPS: Replace all usages of CL_SIZE by COMMAND_LINE_SIZE 2009-12-17 01:56:56 +00:00
bcm63xx MIPS: bcm63xx: Set the correct BCM3302 CPU name 2009-11-02 12:00:07 +01:00
boot MIPS: Remove addinitrd and CONFIG_PROBE_INITRD_HEADER 2009-12-17 01:57:07 +00:00
cavium-octeon MIPS: Octeon: Add platform devices MGMT Ethernet ports. 2009-12-17 01:56:59 +00:00
cobalt Update Yoichi Yuasa's e-mail address 2009-07-03 15:45:29 +01:00
configs MIPS: Remove addinitrd and CONFIG_PROBE_INITRD_HEADER 2009-12-17 01:57:07 +00:00
dec Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-09-18 09:15:24 -07:00
emma MIPS: Remove useless zero initializations. 2009-09-17 20:07:51 +02:00
fw MIPS: IP22: Remove an unused function 2009-12-17 01:56:56 +00:00
gt64120/wrppmc Update Yoichi Yuasa's e-mail address 2009-07-03 15:45:29 +01:00
include/asm MIPS: Collect FPU emulator statistics per-CPU. 2009-12-17 01:57:08 +00:00
jazz MIPS: Add IRQF_TIMER flag for timer interrupts 2009-11-02 12:00:02 +01:00
kernel MIPS: Remove addinitrd and CONFIG_PROBE_INITRD_HEADER 2009-12-17 01:57:07 +00:00
lasat MIPS: Replace all usages of CL_SIZE by COMMAND_LINE_SIZE 2009-12-17 01:56:56 +00:00
lib MIPS: Fix __ndelay build error and add 'ull' suffix for 32-bit kernel 2009-06-17 11:06:24 +01:00
loongson MIPS: Bonito64: Make Loongson independent from Bonito64 code. 2009-12-17 01:57:06 +00:00
math-emu MIPS: Collect FPU emulator statistics per-CPU. 2009-12-17 01:57:08 +00:00
mipssim MIPS: MIPSsim: Remove unused code 2009-12-17 01:57:01 +00:00
mm MIPS: Put PGD in C0_CONTEXT for 64-bit R2 processors. 2009-12-17 01:57:01 +00:00
mti-malta MIPS: Replace all usages of CL_SIZE by COMMAND_LINE_SIZE 2009-12-17 01:56:56 +00:00
nxp MIPS: Add IRQF_TIMER flag for timer interrupts 2009-11-02 12:00:02 +01:00
oprofile MIPS: Oprofile: Rename cpu_type from godson2 to loongson2 2009-11-02 12:00:08 +01:00
pci MIPS: Bonito64: Make Loongson independent from Bonito64 code. 2009-12-17 01:57:06 +00:00
pmc-sierra cpumask: arch_send_call_function_ipi_mask: mips 2009-09-24 09:34:45 +09:30
power MIPS: Use PAGE_SIZE in assembly instead of _PAGE_SIZE. 2009-09-17 20:07:48 +02:00
rb532 MIPS: Replace all usages of CL_SIZE by COMMAND_LINE_SIZE 2009-12-17 01:56:56 +00:00
sgi-ip22 MIPS: IP22, IP28: Build with -Werror 2009-09-17 20:07:44 +02:00
sgi-ip27 MIPS: Add IRQF_TIMER flag for timer interrupts 2009-11-02 12:00:02 +01:00
sgi-ip32 MIPS: IP32: Remove unnecessary if not even harmful volatile keywords. 2009-05-22 13:52:06 +01:00
sibyte MIPS: Replace all usages of CL_SIZE by COMMAND_LINE_SIZE 2009-12-17 01:56:56 +00:00
sni MIPS: Add IRQF_TIMER flag for timer interrupts 2009-11-02 12:00:02 +01:00
txx9 MIPS: Replace all usages of CL_SIZE by COMMAND_LINE_SIZE 2009-12-17 01:56:56 +00:00
vr41xx genirq: Convert irq_desc.lock to raw_spinlock 2009-12-14 23:55:33 +01:00
Kconfig MIPS: Remove addinitrd and CONFIG_PROBE_INITRD_HEADER 2009-12-17 01:57:07 +00:00
Kconfig.debug MIPS: Kconfig: Fix the arch-specific header path 2008-12-12 18:12:23 +00:00
Makefile MIPS: Add support for GZIP / BZIP2 / LZMA compressed kernel images 2009-12-17 01:56:56 +00:00