openssl - Mirror of https://github.com/openssl/openssl

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author	Dr. Stephen Henson <steve@openssl.org>	2004-11-25 17:47:31 +0000
committer	Dr. Stephen Henson <steve@openssl.org>	2004-11-25 17:47:31 +0000
commit	401ee37a3e3d414567e7fa7e683fc176cb12411e (patch)
tree	4e1af58ff404eb4c365da5da521d4f008e1af60f /doc/crypto/EVP_BytesToKey.pod
parent	cb26a20cb105d9ef5cb4706ba18ca2fa5a40a790 (diff)

Allow alternative manual sections to be embedded in .pod file comments.

Diffstat (limited to 'doc/crypto/EVP_BytesToKey.pod')

-rw-r--r--

doc/crypto/EVP_BytesToKey.pod

1 files changed, 1 insertions, 1 deletions

/* * drivers/cpufreq/cpufreq_ondemand.c * * Copyright (C) 2001 Russell King * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. * Jun Nakajima <jun.nakajima@intel.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/smp.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/ctype.h> #include <linux/cpufreq.h> #include <linux/sysctl.h> #include <linux/types.h> #include <linux/fs.h> #include <linux/sysfs.h> #include <linux/sched.h> #include <linux/kmod.h> #include <linux/workqueue.h> #include <linux/jiffies.h> #include <linux/kernel_stat.h> #include <linux/percpu.h> #include <linux/mutex.h> /* * dbs is used in this file as a shortform for demandbased switching * It helps to keep variable names smaller, simpler */ #define DEF_FREQUENCY_UP_THRESHOLD (80) #define MIN_FREQUENCY_UP_THRESHOLD (11) #define MAX_FREQUENCY_UP_THRESHOLD (100) /* * The polling frequency of this governor depends on the capability of * the processor. Default polling frequency is 1000 times the transition * latency of the processor. The governor will work on any processor with * transition latency <= 10mS, using appropriate sampling * rate. * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL) * this governor will not work. * All times here are in uS. */ static unsigned int def_sampling_rate; #define MIN_SAMPLING_RATE_RATIO (2) /* for correct statistics, we need at least 10 ticks between each measure */ #define MIN_STAT_SAMPLING_RATE (MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10)) #define MIN_SAMPLING_RATE (def_sampling_rate / MIN_SAMPLING_RATE_RATIO) #define MAX_SAMPLING_RATE (500 * def_sampling_rate) #define DEF_SAMPLING_RATE_LATENCY_MULTIPLIER (1000) #define DEF_SAMPLING_DOWN_FACTOR (1) #define MAX_SAMPLING_DOWN_FACTOR (10) #define TRANSITION_LATENCY_LIMIT (10 * 1000) static void do_dbs_timer(void *data); struct cpu_dbs_info_s { struct cpufreq_policy *cur_policy; unsigned int prev_cpu_idle_up; unsigned int prev_cpu_idle_down; unsigned int enable; }; static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info); static unsigned int dbs_enable; /* number of CPUs using this policy */ static DEFINE_MUTEX (dbs_mutex); static DECLARE_WORK (dbs_work, do_dbs_timer, NULL); struct dbs_tuners { unsigned int sampling_rate; unsigned int sampling_down_factor; unsigned int up_threshold; unsigned int ignore_nice; }; static struct dbs_tuners dbs_tuners_ins = { .up_threshold = DEF_FREQUENCY_UP_THRESHOLD, .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR, .ignore_nice = 0, }; static inline unsigned int get_cpu_idle_time(unsigned int cpu) { return kstat_cpu(cpu).cpustat.idle + kstat_cpu(cpu).cpustat.iowait + ( dbs_tuners_ins.ignore_nice ? kstat_cpu(cpu).cpustat.nice : 0); } /************************** sysfs interface ************************/ static ssize_t show_sampling_rate_max(struct cpufreq_policy *policy, char *buf) { return sprintf (buf, "%u\n", MAX_SAMPLING_RATE); } static ssize_t show_sampling_rate_min(struct cpufreq_policy *policy, char *buf) { return sprintf (buf, "%u\n", MIN_SAMPLING_RATE); } #define define_one_ro(_name) \ static struct freq_attr _name = \ __ATTR(_name, 0444, show_##_name, NULL) define_one_ro(sampling_rate_max); define_one_ro(sampling_rate_min); /* cpufreq_ondemand Governor Tunables */ #define show_one(file_name, object) \ static ssize_t show_##file_name \ (struct cpufreq_policy *unused, char *buf) \ { \ return sprintf(buf, "%u\n", dbs_tuners_ins.object); \ } show_one(sampling_rate, sampling_rate); show_one(sampling_down_factor, sampling_down_factor); show_one(up_threshold, up_threshold); show_one(ignore_nice_load, ignore_nice); static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused, const char *buf, size_t count) { unsigned int input; int ret; ret = sscanf (buf, "%u", &input); if (ret != 1 ) return -EINVAL; if (input > MAX_SAMPLING_DOWN_FACTOR || input < 1) return -EINVAL; mutex_lock(&dbs_mutex); dbs_tuners_ins.sampling_down_factor = input; mutex_unlock(&dbs_mutex); return count; } static ssize_t store_sampling_rate(struct cpufreq_policy *unused, const char *buf, size_t count) { unsigned int input; int ret; ret = sscanf (buf, "%u", &input); mutex_lock(&dbs_mutex); if (ret != 1 || input > MAX_SAMPLING_RATE || input < MIN_SAMPLING_RATE) { mutex_unlock(&dbs_mutex); return -EINVAL; } dbs_tuners_ins.sampling_rate = input; mutex_unlock(&dbs_mutex); return count; } static ssize_t store_up_threshold(struct cpufreq_policy *unused, const char *buf, size_t count) { unsigned int input; int ret; ret = sscanf (buf, "%u", &input); mutex_lock(&dbs_mutex); if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || input < MIN_FREQUENCY_UP_THRESHOLD) { mutex_unlock(&dbs_mutex); return -EINVAL; } dbs_tuners_ins.up_threshold = input; mutex_unlock(&dbs_mutex); return count; } static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy, const char *buf, size_t count) { unsigned int input; int ret; unsigned int j; ret = sscanf (buf, "%u", &input); if ( ret != 1 ) return -EINVAL; if ( input > 1 ) input = 1; mutex_lock(&dbs_mutex); if ( input == dbs_tuners_ins.ignore_nice ) { /* nothing to do */ mutex_unlock(&dbs_mutex); return count; } dbs_tuners_ins.ignore_nice = input; /* we need to re-evaluate prev_cpu_idle_up and prev_cpu_idle_down */ for_each_online_cpu(j) { struct cpu_dbs_info_s *j_dbs_info; j_dbs_info = &per_cpu(cpu_dbs_info, j); j_dbs_info->prev_cpu_idle_up = get_cpu_idle_time(j); j_dbs_info->prev_cpu_idle_down = j_dbs_info->prev_cpu_idle_up; } mutex_unlock(&dbs_mutex); return count; } #define define_one_rw(_name) \ static struct freq_attr _name = \ __ATTR(_name, 0644, show_##_name, store_##_name) define_one_rw(sampling_rate); define_one_rw(sampling_down_factor); define_one_rw(up_threshold); define_one_rw(ignore_nice_load); static struct attribute * dbs_attributes[] = { &sampling_rate_max.attr, &sampling_rate_min.attr, &sampling_rate.attr, &sampling_down_factor.attr, &up_threshold.attr, &ignore_nice_load.attr, NULL }; static struct attribute_group dbs_attr_group = { .attrs = dbs_attributes, .name = "ondemand", }; /************************** sysfs end ************************/ static void dbs_check_cpu(int cpu) { unsigned int idle_ticks, up_idle_ticks, total_ticks; unsigned int freq_next; unsigned int freq_down_sampling_rate; static int down_skip[NR_CPUS]; struct cpu_dbs_info_s *this_dbs_info; struct cpufreq_policy *policy; unsigned int j; this_dbs_info = &per_cpu(cpu_dbs_info, cpu); if (!this_dbs_info->enable) return; policy = this_dbs_info->cur_policy; /* * Every sampling_rate, we check, if current idle time is less * than 20% (default), then we try to increase frequency * Every sampling_rate*sampling_down_factor, we look for a the lowest * frequency which can sustain the load while keeping idle time over * 30%. If such a frequency exist, we try to decrease to this frequency. * * Any frequency increase takes it to the maximum frequency. * Frequency reduction happens at minimum steps of * 5% (default) of current frequency */ /* Check for frequency increase */ idle_ticks = UINT_MAX; for_each_cpu_mask(j, policy->cpus) { unsigned int tmp_idle_ticks, total_idle_ticks; struct cpu_dbs_info_s *j_dbs_info; j_dbs_info = &per_cpu(cpu_dbs_info, j); total_idle_ticks = get_cpu_idle_time(j); tmp_idle_ticks = total_idle_ticks - j_dbs_info->prev_cpu_idle_up; j_dbs_info->prev_cpu_idle_up = total_idle_ticks; if (tmp_idle_ticks < idle_ticks) idle_ticks = tmp_idle_ticks; } /* Scale idle ticks by 100 and compare with up and down ticks */ idle_ticks *= 100; up_idle_ticks = (


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