Clocks_calc_mult_shift
Web+ clocks_calc_mult_shift(&mult, &shift, freq, NSEC_PER_SEC, maxsec); + cpts->cc_mult = mult; + cpts->cc.mult = mult; + cpts->cc.shift = shift; + /* Check calculations and inform if not precise */ Contrary to this comment, you are not making any kind of judgment about whether the calculations are precise or not. + frac = 0; WebJun 15, 2011 · Multiplication and division can be achieved using bit operators, for example i*2 = i<<1 i*3 = (i<<1) + i; i*10 = (i<<3) + (i<<1) and so on. Is it actually faster to use say (i<<3)+ (i<<1) to multiply with 10 than using i*10 directly? Is there any sort of input that can't be multiplied or divided in this way? c++ c division multiplication bit-shift
Clocks_calc_mult_shift
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WebOn MIPS, with maxsec=4, clocks_calc_mult_shift () may generate a very big mult, which may easily cause timekeeper.mult overflow within timekeeping jobs. e.g. when clock … WebAug 11, 2011 · Message ID: [email protected] (mailing list archive)State: New, archived: Headers: show
Web+ /* Calc the maximum number of seconds which we can run before + * wrapping around. + */ + maxsec = cpts->cc.mask; + do_div(maxsec, freq); + if (!maxsec) + maxsec = 1; + … Web* clocksource_hz2mult - calculates mult from hz and shift: 179 * @hz: Clocksource frequency in Hz: 180 * @shift _constant: Clocksource shift factor: 181 * 182 * Helper functions that converts a hz counter: 183 * frequency to a timsource multiplier, given the: 184 * clocksource shift value: 185 */ 186: static inline u32 clocksource_hz2mult (u32 ...
Webclocks_calc_mult_shift(&cs->mult,&cs->shift, freq, NSEC_PER_SEC / scale, sec * scale); + + /* + * Since mult may be adjusted by ntp, add an extra saftey margin + * for … Webu32 shift, unsigned int *clock_set) {u64 interval = tk->cycle_interval << shift; tk->tkr_mono.cycle_last += interval; tk->tkr_mono.xtime_nsec += tk->xtime_interval << …
Webclockevents_calc_mult_shift(struct clock_event_device *ce, u32 freq, u32 maxsec) return clocks_calc_mult_shift(&ce->mult, &ce->shift, NSEC_PER_SEC, freq, maxsec); …
WebFor some frequqencies, the clocks_calc_mult_shift() function will unfortunately select mult values very close to 0xffffffff. This has the potential to overflow when NTP adjusts the … ao史密斯热水器排水Webclocks_calc_mult_shift (&new_mult, &new_shift, rate, NSEC_PER_SEC, 3600 ); new_mask = CLOCKSOURCE_MASK (bits); cd. rate = rate; /* Calculate how many nanosecs until we risk wrapping */ wrap = clocks_calc_max_nsecs (new_mult, new_shift, 0, new_mask, NULL ); cd. wrap_kt = ns_to_ktime (wrap); rd = cd. read_data [ 0 ]; ao合格後の辞退Webclocksource的mult和shift计算详解. 要想搞明白内核的各种时钟，搞明白clocks_calc_mult_shift ()函数至关重要，下面就是对该函数的详细注释，内核这样做的 … ao和do输出端各自可以接什么东西WebOct 14, 2015 · The clocksource provides helper to calculate mult and shift values: clocks_calc_mult_shift (u32 *mult, u32 *shift, u32 from, u32 to, u32 maxsec) @to and … ao回流污泥比WebLKML Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH v4 00/17] 64-bit friendly generic sched_clock() @ 2013-07-18 23:21 Stephen Boyd 2013-07-18 23:21 ` [PATCH v4 01/17] clocksource: Extract max nsec calculation into separate function Stephen Boyd ` (20 more replies) 0 siblings, 21 replies; 51+ messages in thread From: Stephen … ao史密斯燃气热水器WebUse this calculator to add up your work week time sheet and calculate work hours for payroll. This online time clock uses a standard 12-hour work clock with am and pm or a … ao商用净水器Web* NOTE: This function includes a safety margin of 50%, so that bad clock values * can be detected. */-u64 clocks_calc_max_nsecs(u32 mult, u32 shift, u32 maxadj, u64 mask) +u64 clocks_calc_max_nsecs(u32 mult, u32 shift, u32 maxadj, u64 mask, u64 *max_cyc) {u64 max_nsecs, max_cycles; @@ -493,6 +495,10 @@ u64 … ao天鹰优化算法