linux/arch
Ingo Molnar d2517a49d5 perf_counter, x86: fix zero irq_period counters
The quirk to irq_period unearthed an unrobustness we had in the
hw_counter initialization sequence: we left irq_period at 0, which
was then quirked up to 2 ... which then generated a _lot_ of
interrupts during 'perf stat' runs, slowed them down and skewed
the counter results in general.

Initialize irq_period to the maximum instead.

[ Impact: fix perf stat results ]

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-05-17 12:27:37 +02:00
..
alpha alpha: convert to use __HEAD and HEAD_TEXT macros. 2009-04-26 09:20:38 -07:00
arm arm: Use __INIT macro instead of .text.init. 2009-04-27 19:51:58 -07:00
avr32 clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
blackfin clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
cris
frv FRV: Use __INIT macro instead of .text.init. 2009-04-27 19:46:30 -07:00
h8300
ia64 KVM: ia64: fix locking order entering guest 2009-04-22 13:52:09 +03:00
m32r m32r: convert to use __HEAD and HEAD_TEXT macros. 2009-04-26 09:20:38 -07:00
m68k m68k: arch/m68k/kernel/sun3-head.S needs <linux/init.h> 2009-04-28 16:07:18 -07:00
m68knommu Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu 2009-04-24 08:45:53 -07:00
microblaze microblaze: add parameter to microblaze_read() 2009-04-23 16:27:38 +02:00
mips clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
mn10300 mn10300: convert to use __HEAD and HEAD_TEXT macros. 2009-04-26 09:20:38 -07:00
parisc
powerpc perf_counter: powerpc: supply more precise information on counter overflow events 2009-05-15 16:38:57 +02:00
s390 s390: convert to use __HEAD and HEAD_TEXT macros. 2009-04-26 09:20:39 -07:00
sh sh: Use __INIT macro instead of .text.init. 2009-04-27 19:51:58 -07:00
sparc sparc: cleanup references to deprecated .text.init* sections. 2009-04-27 19:51:58 -07:00
um uml: kill a kconfig warning 2009-04-21 13:41:50 -07:00
x86 perf_counter, x86: fix zero irq_period counters 2009-05-17 12:27:37 +02:00
xtensa xtensa: convert to use __HEAD and HEAD_TEXT macros. 2009-04-26 09:20:38 -07:00
.gitignore
Kconfig