Messages in this thread | | | Date | Sat, 12 Feb 2000 03:55:23 +0100 | From | Artur Skawina <> | Subject | Re: keeping track of time spend in non-user space |
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Sjaak Koot wrote: > > I am using linux kernel 2.2.13 on a Pentium PC. > > I would like to keep track of the CPU time in user space of a process or > task. The user/system time currently implemented is not accurate enough, > its resolution is 10 ms. > > The idea was to keep track when a process enters/leaves the kernel space > and use the time stamp counter to measure the amount of time spend in > the kernel and substract this from the wall clock time. Note that I would like > to know the CPU time in user space for each process separately. > > Anyone already implemented this ?
Jan Astalos <astalos@tuke.sk> has some patches which make use of the TSC for precise time accounting. On 586/686 you could use the MSRs to get exact user/kernel cycle numbers too, but i'm afraid that would be way to slow to be acceptable as a generic solution (a lot extra cycles per every ctx switch).
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