linux/arch
Martin Schwidefsky 79741dd357 [PATCH] idle cputime accounting
The cpu time spent by the idle process actually doing something is
currently accounted as idle time. This is plain wrong, the architectures
that support VIRT_CPU_ACCOUNTING=y can do better: distinguish between the
time spent doing nothing and the time spent by idle doing work. The first
is accounted with account_idle_time and the second with account_system_time.
The architectures that use the account_xxx_time interface directly and not
the account_xxx_ticks interface now need to do the check for the idle
process in their arch code. In particular to improve the system vs true
idle time accounting the arch code needs to measure the true idle time
instead of just testing for the idle process.
To improve the tick based accounting as well we would need an architecture
primitive that can tell us if the pt_regs of the interrupted context
points to the magic instruction that halts the cpu.

In addition idle time is no more added to the stime of the idle process.
This field now contains the system time of the idle process as it should
be. On systems without VIRT_CPU_ACCOUNTING this will always be zero as
every tick that occurs while idle is running will be accounted as idle
time.

This patch contains the necessary common code changes to be able to
distinguish idle system time and true idle time. The architectures with
support for VIRT_CPU_ACCOUNTING need some changes to exploit this.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-12-31 15:11:46 +01:00
..
alpha alpha: remove dead BIO_VMERGE_BOUNDARY 2008-12-29 08:29:51 +01:00
arm Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-12-30 17:36:49 -08:00
avr32 avr32: favr-32 build fix 2008-12-18 16:22:13 +01:00
blackfin kbuild: use KECHO convenience echo 2008-12-03 21:32:01 +01:00
cris [CRIS] Remove links from CRIS build 2008-10-31 23:37:57 +01:00
frv frv: fix mmap2 error handling 2008-12-01 19:55:24 -08:00
h8300 Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/dvrabel/uwb 2008-10-23 08:20:34 -07:00
ia64 [PATCH] idle cputime accounting 2008-12-31 15:11:46 +01:00
m32r Merge branch 'sched/urgent' into sched/core 2008-12-08 13:52:00 +01:00
m68k m68k: fix trigraph ignored warning in setox.S 2008-12-28 20:00:05 +01:00
m68knommu
mips Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-12-28 12:27:58 -08:00
mn10300 MN10300: Give correct size when reserving interrupt vector table 2008-12-10 13:34:33 -08:00
parisc Merge branch 'next' into for-linus 2008-12-25 11:40:09 +11:00
powerpc [PATCH] idle cputime accounting 2008-12-31 15:11:46 +01:00
s390 [PATCH] idle cputime accounting 2008-12-31 15:11:46 +01:00
sh Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6 2008-12-28 12:33:21 -08:00
sparc Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 2008-12-28 20:19:47 -08:00
um Merge branch 'core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-12-30 16:10:19 -08:00
x86 [PATCH] idle cputime accounting 2008-12-31 15:11:46 +01:00
xtensa xtensa: Kill directly reference of netdev->priv 2008-12-04 15:06:56 -08:00
.gitignore
Kconfig oprofile: select RING_BUFFER 2008-12-12 09:46:31 +01:00