diff options
author | Paul Mackerras <paulus@samba.org> | 2007-11-09 22:39:38 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2007-11-09 22:39:38 +0100 |
commit | fa13a5a1f25f671d084d8884be96fc48d9b68275 (patch) | |
tree | 97dae05bb5baef806a6dcbeed8b7eb5bdc61e4ae /include/asm-powerpc | |
parent | 9a41785cc43d88397f787a651ed7286a33f8462f (diff) |
sched: restore deterministic CPU accounting on powerpc
Since powerpc started using CONFIG_GENERIC_CLOCKEVENTS, the
deterministic CPU accounting (CONFIG_VIRT_CPU_ACCOUNTING) has been
broken on powerpc, because we end up counting user time twice: once in
timer_interrupt() and once in update_process_times().
This fixes the problem by pulling the code in update_process_times
that updates utime and stime into a separate function called
account_process_tick. If CONFIG_VIRT_CPU_ACCOUNTING is not defined,
there is a version of account_process_tick in kernel/timer.c that
simply accounts a whole tick to either utime or stime as before. If
CONFIG_VIRT_CPU_ACCOUNTING is defined, then arch code gets to
implement account_process_tick.
This also lets us simplify the s390 code a bit; it means that the s390
timer interrupt can now call update_process_times even when
CONFIG_VIRT_CPU_ACCOUNTING is turned on, and can just implement a
suitable account_process_tick().
account_process_tick() now takes the task_struct * as an argument.
Tested both with and without CONFIG_VIRT_CPU_ACCOUNTING.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-powerpc')
0 files changed, 0 insertions, 0 deletions