From 641b9e0e8b7f96425da6ce98f3361e3af0baee29 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Fri, 16 Mar 2007 01:18:42 -0700 Subject: [NET_SCHED]: Use ktime as clocksource Get rid of the manual clock source selection mess and use ktime. Also use a scalar representation, which allows to clean up pkt_sched.h a bit more and results in less ktime_to_ns() calls in most cases. The PSCHED_US2JIFFIE/PSCHED_JIFFIE2US macros are implemented quite inefficient by this patch, following patches will convert all qdiscs to hrtimers and get rid of them entirely. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/sched/sch_api.c | 77 ++--------------------------------------------------- 1 file changed, 2 insertions(+), 75 deletions(-) (limited to 'net/sched/sch_api.c') diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 4a927a5e1fa..d71bf79eb80 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1175,15 +1175,12 @@ reclassify: return -1; } -static int psched_us_per_tick = 1; -static int psched_tick_per_us = 1; - #ifdef CONFIG_PROC_FS static int psched_show(struct seq_file *seq, void *v) { seq_printf(seq, "%08x %08x %08x %08x\n", - psched_tick_per_us, psched_us_per_tick, - 1000000, HZ); + (u32)NSEC_PER_USEC, (u32)PSCHED_US2NS(1), + 1000000, HZ); return 0; } @@ -1202,80 +1199,10 @@ static const struct file_operations psched_fops = { }; #endif -#ifdef CONFIG_NET_SCH_CLK_CPU -psched_tdiff_t psched_clock_per_hz; -int psched_clock_scale; -EXPORT_SYMBOL(psched_clock_per_hz); -EXPORT_SYMBOL(psched_clock_scale); - -psched_time_t psched_time_base; -cycles_t psched_time_mark; -EXPORT_SYMBOL(psched_time_mark); -EXPORT_SYMBOL(psched_time_base); - -/* - * Periodically adjust psched_time_base to avoid overflow - * with 32-bit get_cycles(). Safe up to 4GHz CPU. - */ -static void psched_tick(unsigned long); -static DEFINE_TIMER(psched_timer, psched_tick, 0, 0); - -static void psched_tick(unsigned long dummy) -{ - if (sizeof(cycles_t) == sizeof(u32)) { - psched_time_t dummy_stamp; - PSCHED_GET_TIME(dummy_stamp); - psched_timer.expires = jiffies + 1*HZ; - add_timer(&psched_timer); - } -} - -int __init psched_calibrate_clock(void) -{ - psched_time_t stamp, stamp1; - struct timeval tv, tv1; - psched_tdiff_t delay; - long rdelay; - unsigned long stop; - - psched_tick(0); - stop = jiffies + HZ/10; - PSCHED_GET_TIME(stamp); - do_gettimeofday(&tv); - while (time_before(jiffies, stop)) { - barrier(); - cpu_relax(); - } - PSCHED_GET_TIME(stamp1); - do_gettimeofday(&tv1); - - delay = PSCHED_TDIFF(stamp1, stamp); - rdelay = tv1.tv_usec - tv.tv_usec; - rdelay += (tv1.tv_sec - tv.tv_sec)*1000000; - if (rdelay > delay) - return -1; - delay /= rdelay; - psched_tick_per_us = delay; - while ((delay>>=1) != 0) - psched_clock_scale++; - psched_us_per_tick = 1<>psched_clock_scale; - return 0; -} -#endif - static int __init pktsched_init(void) { struct rtnetlink_link *link_p; -#ifdef CONFIG_NET_SCH_CLK_CPU - if (psched_calibrate_clock() < 0) - return -1; -#elif defined(CONFIG_NET_SCH_CLK_JIFFIES) - psched_tick_per_us = HZ<