Re: [RFC PATCH 16/22 -v2] add get_monotonic_cycles

[Steven Rostedt]

On Thu, 17 Jan 2008, Paul Mackerras wrote:
>
> It's very hard to do a per-thread counter in the VDSO, since threads
> in the same process see the same memory, by definition.  You'd have to
> have an array of counters and have some way for each thread to know
> which entry to read.  Also you'd have to find space for tens or
> hundreds of thousands of counters, since there can be that many
> threads in a process sometimes.

I was thinking about this. What would also work is just the ability to
read the schedule counter for the current cpu. Now this would require that
the task had a way to know which CPU it was currently on.

-- Steve

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/