Messages in this thread | | | From | "Albert D. Cahalan" <> | Subject | Re: HZ, preferably as small as possible | Date | Mon, 15 Jul 2002 12:07:18 -0400 (EDT) |
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Russell King writes: > On Mon, Jul 15, 2002 at 02:56:14AM -0400, Albert D. Cahalan wrote:
>> Unfortunately, the hack must remain for another 4 years or so. >> Maybe that's not so bad though. I prefer it over this: >> >> #ifdef __386__ >> #define HZ 100 >> #endif >> #ifdef __IA64__ >> #define HZ 1024 >> #endif >> #ifdef __ARM__ >> #define HZ 128 // if they settle on this > > Ehh? It's been 100 on the majority of ARM. If it's different in libproc, > the libproc is broken.
It's not a different value in libproc. There's autodetection. I can't just support "the majority of ARM", and people keep giving me shit about HZ supposedly being a per-arch constant. (not that there's a sane way to get a per-arch constant from user code anyway)
> One (broken) machine type decided it would be a > good idea to change it to 1000. Since no one has paid any attention > to this machine for some time, it's support code will get dropped if > they don't fix it before 2.6.
You have 64, 128, and 1000. See for yourself.
arch-cl7500/param.h #define HZ 100 arch-epxa10db/param.h #define HZ 100 arch-integrator/param.h #define HZ 100 arch-l7200/param.h #define HZ 128 arch-shark/param.h #define HZ 64 arch-tbox/param.h #define HZ 1000
I need to support all of that with one binary. So I'm stuck with:
case 9 ... 11 : Hertz = 10; break; /* S/390 (sometimes) */ case 18 ... 22 : Hertz = 20; break; /* user-mode Linux */ case 30 ... 34 : Hertz = 32; break; /* ia64 emulator */ case 48 ... 52 : Hertz = 50; break; case 58 ... 62 : Hertz = 60; break; case 63 ... 65 : Hertz = 64; break; /* StrongARM /Shark */ case 95 ... 105 : Hertz = 100; break; /* normal Linux */ case 124 ... 132 : Hertz = 128; break; /* MIPS, ARM */ case 195 ... 204 : Hertz = 200; break; /* normal << 1 */ case 253 ... 260 : Hertz = 256; break; case 393 ... 408 : Hertz = 400; break; /* normal << 2 */ case 790 ... 808 : Hertz = 800; break; /* normal << 3 */ case 990 ... 1010 : Hertz = 1000; break; /* ARM */ case 1015 ... 1035 : Hertz = 1024; break; /* Alpha, ia64 */ case 1180 ... 1220 : Hertz = 1200; break; /* Alpha */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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