Simon Horman wrote:
When I apply this patch and enable VIRT_CPU_ACCOUNTING I get the following build error. Perhaps the fragment that creates account_process_tick in arch/ia64/kernel/time.c is missing? kernel/built-in.o: In function `update_process_times': undefined reference to `account_process_tick'
I found that this error is caused by change of update_process_times, i.e. the following commit. Since my patches are based on 2.6.23, they should be rebased on 2.6.24-rcX and have some fixes.
commit fa13a5a1f25f671d084d8884be96fc48d9b68275 Author: Paul Mackerras <paulus@xxxxxxxxx> Date: Fri Nov 9 22:39:38 2007 +0100 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@xxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Thanks, H.Seto - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
![]() |