From f490c84a396f4de9ef879055e20fbebd224bab06 Mon Sep 17 00:00:00 2001 From: binss Date: Tue, 4 Apr 2017 10:56:41 +0800 Subject: [PATCH] fix typo --- Timers/timers-2.md | 2 +- Timers/timers-3.md | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/Timers/timers-2.md b/Timers/timers-2.md index 1ee2c74..a669361 100644 --- a/Timers/timers-2.md +++ b/Timers/timers-2.md @@ -269,7 +269,7 @@ void __clocksource_update_freq_scale(struct clocksource *cs, u32 scale, u32 freq } ``` -Here we can see calculation of the maximum number of seconds which we can run before a clock source counter will overflow. First of all we fill the `sec` variable with the value of a clock source mask. Remember that a clock source's mask represents maximum amount of bits that are valid for the given clock source. After this, we can see two division operations. At first we divide our `sec` variable on a clock source frequency and then on scale factor. The `freq` parameter shows us how many timer interrupts will be occurred in one second. So, we divide `mask` value that represents maximum number of a counter (for example `jiffy`) on the frequency of a timer and will get the maximum number of seconds for the certain clock source. The second division operation will give us maximum number of seconds for the certain clock source depends on its scale factor which can be `1` hertz or `1` kilohertz (10^ Hz). +Here we can see calculation of the maximum number of seconds which we can run before a clock source counter will overflow. First of all we fill the `sec` variable with the value of a clock source mask. Remember that a clock source's mask represents maximum amount of bits that are valid for the given clock source. After this, we can see two division operations. At first we divide our `sec` variable on a clock source frequency and then on scale factor. The `freq` parameter shows us how many timer interrupts will be occurred in one second. So, we divide `mask` value that represents maximum number of a counter (for example `jiffy`) on the frequency of a timer and will get the maximum number of seconds for the certain clock source. The second division operation will give us maximum number of seconds for the certain clock source depends on its scale factor which can be `1` hertz or `1` kilohertz (10^3 Hz). After we have got maximum number of seconds, we check this value and set it to `1` or `600` depends on the result at the next step. These values is maximum sleeping time for a clocksource in seconds. In the next step we can see call of the `clocks_calc_mult_shift`. Main point of this function is calculation of the `mult` and `shift` values for a given clock source. In the end of the `__clocksource_update_freq_scale` function we check that just calculated `mult` value of a given clock source will not cause overflow after adjustment, update the `max_idle_ns` and `max_cycles` values of a given clock source with the maximum nanoseconds that can be converted to a clock source counter and print result to the kernel buffer: diff --git a/Timers/timers-3.md b/Timers/timers-3.md index d56bd3c..1750a52 100644 --- a/Timers/timers-3.md +++ b/Timers/timers-3.md @@ -330,7 +330,7 @@ if (!tick_nohz_full_running) { } ``` -If this mode is not running we call the `tick_nohz_init_all` function that defined in the same source code file and check its result. The `tick_nohz_init_all` function tries to allocate the `tick_nohz_full_mask` with the call of the `alloc_cpumask_var` that will allocate space for a `tick_nohz_full_mask`. The `tck_nohz_full_mask` will store numbers of processors that have enabled full `NO_HZ`. After successful allocation of the `tick_nohz_full_mask` we set all bits in the `tick_nogz_full_mask`, set the `tick_nohz_full_running` and return result to the `tick_nohz_init` function: +If this mode is not running we call the `tick_nohz_init_all` function that defined in the same source code file and check its result. The `tick_nohz_init_all` function tries to allocate the `tick_nohz_full_mask` with the call of the `alloc_cpumask_var` that will allocate space for a `tick_nohz_full_mask`. The `tick_nohz_full_mask` will store numbers of processors that have enabled full `NO_HZ`. After successful allocation of the `tick_nohz_full_mask` we set all bits in the `tick_nohz_full_mask`, set the `tick_nohz_full_running` and return result to the `tick_nohz_init` function: ```C static int tick_nohz_init_all(void)