Re: [PATCH 2.6]: Make packet scheduler clock source configurable

[Patrick McHardy <kaber@xxxxxxxxx>]

David S. Miller wrote:
> I also want to add sparc64 %tick register support here too.
> This is an area with a lot of potential cleanup.  We should
> made an asm/pkt_sched.h to abstract out the clock source
> implementation instead of loading net/pkt_sched.h up with
> a pile of ifdefs.
Couldn't we just use get_cycles() ? Something like this:

#include <asm/timex.h>

#if sizeof(cycles_t) == sizeof(u64)

#define PSCHED_GET_TIME(stamp) \
do { \
        u64 cur = get_cycles(); \
        stamp) = cur >> psched_clock_scale; \
} while (0)

#else

#define PSCHED_WATCHER u32
extern PSCHED_WATCHER psched_time_mark;

#define PSCHED_GET_TIME(stamp) \
do { \
        u32 cur = get_cycles(); \
        if (cur <= psched_time_mark) \
                psched_time_base += 0x100000000UL; \
        psched_time_mark = cur; \
        (stamp) = (psched_time_base + cur) >> psched_clock_scale; \
} while (0)

#endif

Regards
Patrick