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Jack Steiner 1cf24bdbbb [IA64] - Reduce overhead of FP exception logging messages 
Improve the scalability of the fpswa code that rate-limits
logging of messages.

There are 2 distinctly different problems in this code.

1) If prctl is used to disable logging, last_time is never
   updated. The result is that fpu_swa_count is zeroed out on
   EVERY fp fault. This causes a very very hot cache line.
   The fix reduces the wallclock time of a 1024p FP exception test
   from 28734 sec to 19 sec!!!

2) On VERY large systems, excessive messages are logged because
   multiple cpus can each reset or increment fpu_swa_count at
   about the same time. The result is that hundreds of messages
   are logged each second. The fixes reduces the logging rate
   to ~1 per second.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2006-12-12 11:47:09 -08:00
..
cpufreq [PATCH] Add support for type argument in PAL_GET_PSTATE 2006-12-07 11:21:55 -08:00
acpi-ext.c Pull acpi_os_free into release branch 2006-07-01 17:19:08 -04:00
acpi-processor.c fix file specification in comments 2006-10-03 23:01:26 +02:00
acpi.c [IA64] remove unused acpi_kbd_controller_present, acpi_legacy_devices 2006-10-17 14:57:33 -07:00
asm-offsets.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
audit.c [PATCH] audit: AUDIT_PERM support 2006-09-11 13:32:30 -04:00
brl_emu.c
crash_dump.c [IA64] CONFIG_KEXEC/CONFIG_CRASH_DUMP permutations 2006-12-12 10:11:00 -08:00
crash.c [IA64] CONFIG_KEXEC/CONFIG_CRASH_DUMP permutations 2006-12-12 10:11:00 -08:00
cyclone.c [IA64] don't report !sn2 or !summit hardware as an error 2006-03-07 15:26:49 -08:00
efi_stub.S [IA64] make efi_stub.S fit in 80 cols 2006-06-21 14:35:28 -07:00
efi.c [IA64] resolve name clash by renaming is_available_memory() 2006-12-07 13:46:12 -08:00
entry.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
entry.S [IA64] IA64 Kexec/kdump 2006-12-07 09:51:35 -08:00
esi_stub.S [IA64] esi-support 2006-06-21 11:19:22 -07:00
esi.c [IA64] esi-support 2006-06-21 11:19:22 -07:00
fsys.S [IA64] cleanup in fsys.S 2006-02-28 08:53:32 -08:00
gate-data.S
gate.lds.S [PATCH] vDSO hash-style fix 2006-07-31 13:28:43 -07:00
gate.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head.S [IA64] Save register stack contents on cpu start 2006-09-08 11:05:13 -07:00
ia64_ksyms.c [IA64] Need export for csum_ipv6_magic 2006-12-07 13:18:57 -08:00
init_task.c [PATCH] nsproxy: move init_nsproxy into kernel/nsproxy.c 2006-10-02 07:57:20 -07:00
iosapic.c [IA64] IA64 Kexec/kdump 2006-12-07 09:51:35 -08:00
irq_ia64.c [IA64] use generic_handle_irq() 2006-11-16 09:38:35 -08:00
irq_lsapic.c [IA64] typename -> name conversion 2006-11-16 09:38:02 -08:00
irq.c [IA64] use generic_handle_irq() 2006-11-16 09:38:35 -08:00
ivt.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
jprobes.S
kprobes.c Merge branch 'release' of master.kernel.org:/pub/scm/linux/kernel/git/aegl/linux-2.6 2006-12-07 15:39:22 -08:00
machine_kexec.c [IA64] kexec/kdump: tidy up declaration of relocate_new_kernel_t 2006-12-12 10:12:08 -08:00
machvec.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
Makefile [IA64] CONFIG_KEXEC/CONFIG_CRASH_DUMP permutations 2006-12-12 10:11:00 -08:00
mca_asm.S [IA64] ar.fpsr not set on MCA/INIT kernel entry 2006-09-26 15:20:35 -07:00
mca_drv_asm.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
mca_drv.c [IA64] MCA recovery: Montecito support 2006-10-31 14:30:34 -08:00
mca_drv.h [IA64] printing support for MCA/INIT 2006-09-26 14:44:37 -07:00
mca.c [IA64] CONFIG_KEXEC/CONFIG_CRASH_DUMP permutations 2006-12-12 10:11:00 -08:00
minstate.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
module.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
msi_ia64.c [PATCH] msi: move the ia64 code into arch/ia64 2006-10-04 07:55:29 -07:00
numa.c [PATCH] cpumask: export node_to_cpu_mask consistently 2006-10-02 07:57:17 -07:00
pal.S [IA64] reformat pal.S to fit in 80 columns, fix typos 2006-10-17 14:54:19 -07:00
palinfo.c Merge branch 'release' of master.kernel.org:/pub/scm/linux/kernel/git/aegl/linux-2.6 2006-12-07 15:39:22 -08:00
patch.c [IA64] add init declaration - gate page functions 2006-03-22 16:54:38 -08:00
perfmon_default_smpl.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
perfmon_generic.h
perfmon_itanium.h
perfmon_mckinley.h
perfmon_montecito.h [IA64] sparse cleanups 2006-12-07 10:48:19 -08:00
perfmon.c [PATCH] struct path: convert ia64 2006-12-08 08:28:45 -08:00
process.c [PATCH] remove remaining errno and __KERNEL_SYSCALLS__ references 2006-10-02 07:57:23 -07:00
ptrace.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
relocate_kernel.S [IA64] IA64 Kexec/kdump 2006-12-07 09:51:35 -08:00
sal.c [IA64] move SAL_CACHE_FLUSH check later in boot 2006-10-31 14:32:10 -08:00
salinfo.c [PATCH] struct path: convert ia64 2006-12-08 08:28:45 -08:00
semaphore.c
setup.c [IA64] Kexec/Kdump: honour non-zero crashkernel offset. 2006-12-12 10:11:37 -08:00
sigframe.h
signal.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
smp.c [IA64] CONFIG_KEXEC/CONFIG_CRASH_DUMP permutations 2006-12-12 10:11:00 -08:00
smpboot.c WorkQueue: Fix up arch-specific work items where possible 2006-12-05 19:36:26 +00:00
sys_ia64.c [PATCH] IA64,sparc: local DoS with corrupted ELFs 2006-09-08 08:40:46 -07:00
time.c [IA64] - Allow IPIs in timer loop 2006-10-17 14:51:49 -07:00
topology.c [PATCH] i386: change the 'no_control' field to 'hotpluggable' in the struct cpu 2006-12-07 02:14:10 +01:00
traps.c [IA64] - Reduce overhead of FP exception logging messages 2006-12-12 11:47:09 -08:00
unaligned.c [IA64] sysctl option to silence unaligned trap warnings 2006-02-28 09:42:23 -08:00
uncached.c [PATCH] Define easier to handle GFP_THISNODE 2006-09-26 08:48:50 -07:00
unwind_decoder.c
unwind_i.h
unwind.c
vmlinux.lds.S [PATCH] vmlinux.lds: consolidate initcall sections 2006-10-27 15:34:51 -07:00