2024 Clocks_calc_mult

Clocks_calc_mult_shift

Author: wxtn

August undefined, 2024

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 ... 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 …

[v3] ARM: sched_clock: allow sched_clock to be selected at runtime

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; WebMay 4, 2016 · The call to clocks_calc_mult_shift () at the bottom would need to be modified so that the timer is programmed properly. For more accuracy, you can disable dynamic frequency scaling for the memory controller (if it is enabled). I don’t know how to disable that. Then use the BUS_CYCLES performance counter event as a time base. … science diet perfect weight cat wet food

[PATCH v12 clocksource 4/5] clocksource: Reduce clocksource …

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 … Webvoid __clocksource_update_freq_scale(struct clocksource *cs, u32 scale, u32 freq) { u64 sec; if (freq) { sec = cs->mask; do_div(sec, freq); do_div(sec, scale); if (!sec) sec = 1; … WebJul 19, 2024 · From: John Stultz <> Subject [PATCH 5/5] time: Introduce one suspend clocksource to compensate the suspend time: Date: Thu, 19 Jul 2024 17:38:47 -0700 science diet perfect weight small dog

linux/clocksource.h at master · torvalds/linux · GitHub

linux/sched_clock.c at master · torvalds/linux · GitHub

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 … WebThe minsec argument to clocks_calc_mult_shift() is misnamed. It is used to clamp the magnitude of the mult factor so that a multiplication with any value in the given range … prather meadows dorrington caWebFor 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 … science diet perfect weight wet cat food

"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 … " - Clocks_calc_mult_shift

Clocks_calc_mult_shift

Webclocks_calc_mult_shift(&cs->mult, &cs->shift, freq, NSEC_PER_SEC / scale, sec * scale);} + + /* + * If the uncertainty margin is not specified, calculate it. + * If both scale and freq are non-zero, calculate the clock + * period, but bound below at 2*WATCHDOG_MAX_SKEW. However, + * if either of scale or freq is zero, be very … 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 …

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Web* calculated mult and shift factors. This guarantees that no 64bit * overflow happens when the input value of the conversion is @@ -131,7 +131,7 @@ EXPORT_SYMBOL_GPL(timecounter_cyc2time); * factors. */ void-clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec) Webclocks_calc_max_nsecs (u32 mult, u32 shift, u32 maxadj, u64 mask, u64 *max_cycles); extern void: clocks_calc_mult_shift (u32 *mult, u32 *shift, u32 from, u32 to, u32 …

WebDefined in 1 files as a function: kernel/time/clocksource.c, line 47 (as a function) Web* Re: Export clocks_calc_mult_shift() function 2016-03-08 22:25 Export clocks_calc_mult_shift() function Murali Karicheri @ 2016-03-08 22:53 ` John Stultz …

Web/* Calculate the mult/shift to convert counter ticks to ns. */ clocks_calc_mult_shift (&new_mult, &new_shift, rate, NSEC_PER_SEC, 3600); new_mask = … WebWe need to calculate the same number in the clocksource code and the sched_clock code, so extract this code into its own function. We also drop the min_t and just use min() because the two types are the same.

Web[] (Ldiv0_64\+0x8/0x18) from [] (clocks_calc_mult_shift\+0x70/0xa4) [] …

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; + … science diet puppy chowWebLKML 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 … pratherm ec 20WebAug 11, 2011 · Message ID: [email protected] (mailing list archive)State: New, archived: Headers: show prather meat companyWebu32 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 << … science diet pet food reviewsWebAug 30, 2011 · Message ID: [email protected] (mailing list archive)State: New, archived: Headers: show science diet pet food near meWeb+ clocks_calc_mult_shift(&cc->mult, &cc->shift, cs_ts_freq, + NSEC_PER_SEC, maxsec); +static void i915_perf_init_timecounter(struct i915_perf_stream *stream) +#define SYSTIME_START_OFFSET 350000 /* Counter read takes about 350us */ + … science diet puppy dry foodWeb> CPU Freq:500001000, mult:0xffffde72, shift:30 > CPU Freq:500002000, mult:0xffffbce4, shift:30 > CPU Freq:500003000, mult:0xffff9b56, shift:30 > CPU Freq:500004000, … science diet reviews and complaints