On Sun, 25 Mar 2007, Con Kolivas wrote:
On Sunday 25 March 2007 21:46, Con Kolivas wrote:
On Sunday 25 March 2007 21:34, malc wrote:
On Sun, 25 Mar 2007, Ingo Molnar wrote:
* Con Kolivas <[EMAIL PROTECTED]> wrote:
For an rsdl 0.33 patched kernel. Comments? Overhead worth it?
[..snip..]
---
Currently we only do cpu accounting to userspace based on what is
actually happening precisely on each tick. The accuracy of that
accounting gets progressively worse the lower HZ is. As we already keep
accounting of nanosecond resolution we can accurately track user cpu,
nice cpu and idle cpu if we move the accounting to update_cpu_clock with
a nanosecond cpu_usage_stat entry. This increases overhead slightly but
avoids the problem of tick aliasing errors making accounting unreliable.
Signed-off-by: Con Kolivas <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
[..snip..]
Forgot to mention. Given that this goes into the kernel, shouldn't
Documentation/cpu-load.txt be amended/removed?
--
vale
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