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![Ingo Molnar](/assets/img/avatar_default.png)
* Get rid of underscores polluting the vtime namespace * Consolidate context switch and tick handling * Improve debuggability by detecting irq unsafe callers Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAABAgAGBQJQq52nAAoJEIUkVEdQjox3ZRoP/RuDC59hNGu3rR0ERMM3TqW3 SIaMSHlHQh3h8P8OASpRqBb9s0BoWD0l3xZ68TEACnRdLS50Rre2P0SSxqpkdbnL cj0+I7gmbxKa9c9zpm+mn1TvL2bEhg6hkWCMK9jn2SSBl33cOqKUGUfy8Gx0nryc q+cOZrXSgMvYKCixGubCqsTl8MKs9CrpyrLSYtFUiHFVWREPfndS9M9BB5yfKHL1 t9qmdb5WRq2NpU6apoZBMBdPQcmQr5WswLpbhoTocpvCiEmt5RZGkSDOawPa1DHP 2SPM7fGZIDrXCMW/g9d2mt43j/HxS9LYu9lToZCbbMqehe2Bf5jYqO1Kwi7FhedR NSofoXbW/j589+7I+pN66lo0pctNWxd59YDvLw22SqUFcBEUSmypM6eUwbrbVUg7 /H0a8T/5bPwx2ukNrCW0+Zsd9X3If4K290j4lNOMLki9ikYG6IXfGw1GMwsiyFSo LNSnDs0ekovvWOAg1iRq8DW8j/TWoZuZUSRME2LdCde9SbkMEGgWaNYCwNLMenie 6jZHar7SfpdRDPP6NCY85jMy5MRbyN3mzSFhMfqMKQgmFNd7ay7oRKppIkwT+qkD VozCvdPmCxd+orNMbWINDAhNY5RUlcPj/Em8Mue1U152rpjfNt/WZOfmujmLwNW2 /RPQtHo+F7w7KhbylFpx =cL3t -----END PGP SIGNATURE----- Merge tag 'sched-cputime-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into sched/core Pull more cputime cleanups from Frederic Weisbecker: * Get rid of underscores polluting the vtime namespace * Consolidate context switch and tick handling * Improve debuggability by detecting irq unsafe callers Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@kernel.org>
589 lines
15 KiB
C
589 lines
15 KiB
C
#include <linux/export.h>
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#include <linux/sched.h>
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#include <linux/tsacct_kern.h>
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#include <linux/kernel_stat.h>
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#include <linux/static_key.h>
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#include "sched.h"
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#ifdef CONFIG_IRQ_TIME_ACCOUNTING
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/*
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* There are no locks covering percpu hardirq/softirq time.
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* They are only modified in vtime_account, on corresponding CPU
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* with interrupts disabled. So, writes are safe.
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* They are read and saved off onto struct rq in update_rq_clock().
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* This may result in other CPU reading this CPU's irq time and can
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* race with irq/vtime_account on this CPU. We would either get old
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* or new value with a side effect of accounting a slice of irq time to wrong
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* task when irq is in progress while we read rq->clock. That is a worthy
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* compromise in place of having locks on each irq in account_system_time.
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*/
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DEFINE_PER_CPU(u64, cpu_hardirq_time);
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DEFINE_PER_CPU(u64, cpu_softirq_time);
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static DEFINE_PER_CPU(u64, irq_start_time);
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static int sched_clock_irqtime;
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void enable_sched_clock_irqtime(void)
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{
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sched_clock_irqtime = 1;
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}
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void disable_sched_clock_irqtime(void)
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{
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sched_clock_irqtime = 0;
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}
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#ifndef CONFIG_64BIT
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DEFINE_PER_CPU(seqcount_t, irq_time_seq);
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#endif /* CONFIG_64BIT */
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/*
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* Called before incrementing preempt_count on {soft,}irq_enter
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* and before decrementing preempt_count on {soft,}irq_exit.
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*/
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void irqtime_account_irq(struct task_struct *curr)
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{
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unsigned long flags;
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s64 delta;
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int cpu;
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if (!sched_clock_irqtime)
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return;
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local_irq_save(flags);
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cpu = smp_processor_id();
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delta = sched_clock_cpu(cpu) - __this_cpu_read(irq_start_time);
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__this_cpu_add(irq_start_time, delta);
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irq_time_write_begin();
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/*
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* We do not account for softirq time from ksoftirqd here.
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* We want to continue accounting softirq time to ksoftirqd thread
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* in that case, so as not to confuse scheduler with a special task
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* that do not consume any time, but still wants to run.
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*/
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if (hardirq_count())
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__this_cpu_add(cpu_hardirq_time, delta);
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else if (in_serving_softirq() && curr != this_cpu_ksoftirqd())
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__this_cpu_add(cpu_softirq_time, delta);
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irq_time_write_end();
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL_GPL(irqtime_account_irq);
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static int irqtime_account_hi_update(void)
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{
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u64 *cpustat = kcpustat_this_cpu->cpustat;
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unsigned long flags;
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u64 latest_ns;
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int ret = 0;
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local_irq_save(flags);
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latest_ns = this_cpu_read(cpu_hardirq_time);
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if (nsecs_to_cputime64(latest_ns) > cpustat[CPUTIME_IRQ])
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ret = 1;
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local_irq_restore(flags);
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return ret;
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}
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static int irqtime_account_si_update(void)
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{
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u64 *cpustat = kcpustat_this_cpu->cpustat;
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unsigned long flags;
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u64 latest_ns;
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int ret = 0;
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local_irq_save(flags);
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latest_ns = this_cpu_read(cpu_softirq_time);
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if (nsecs_to_cputime64(latest_ns) > cpustat[CPUTIME_SOFTIRQ])
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ret = 1;
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local_irq_restore(flags);
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return ret;
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}
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#else /* CONFIG_IRQ_TIME_ACCOUNTING */
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#define sched_clock_irqtime (0)
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#endif /* !CONFIG_IRQ_TIME_ACCOUNTING */
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static inline void task_group_account_field(struct task_struct *p, int index,
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u64 tmp)
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{
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#ifdef CONFIG_CGROUP_CPUACCT
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struct kernel_cpustat *kcpustat;
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struct cpuacct *ca;
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#endif
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/*
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* Since all updates are sure to touch the root cgroup, we
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* get ourselves ahead and touch it first. If the root cgroup
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* is the only cgroup, then nothing else should be necessary.
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*
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*/
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__get_cpu_var(kernel_cpustat).cpustat[index] += tmp;
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#ifdef CONFIG_CGROUP_CPUACCT
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if (unlikely(!cpuacct_subsys.active))
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return;
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rcu_read_lock();
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ca = task_ca(p);
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while (ca && (ca != &root_cpuacct)) {
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kcpustat = this_cpu_ptr(ca->cpustat);
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kcpustat->cpustat[index] += tmp;
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ca = parent_ca(ca);
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}
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rcu_read_unlock();
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#endif
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}
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/*
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* Account user cpu time to a process.
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* @p: the process that the cpu time gets accounted to
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* @cputime: the cpu time spent in user space since the last update
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* @cputime_scaled: cputime scaled by cpu frequency
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*/
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void account_user_time(struct task_struct *p, cputime_t cputime,
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cputime_t cputime_scaled)
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{
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int index;
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/* Add user time to process. */
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p->utime += cputime;
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p->utimescaled += cputime_scaled;
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account_group_user_time(p, cputime);
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index = (TASK_NICE(p) > 0) ? CPUTIME_NICE : CPUTIME_USER;
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/* Add user time to cpustat. */
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task_group_account_field(p, index, (__force u64) cputime);
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/* Account for user time used */
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acct_update_integrals(p);
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}
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/*
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* Account guest cpu time to a process.
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* @p: the process that the cpu time gets accounted to
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* @cputime: the cpu time spent in virtual machine since the last update
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* @cputime_scaled: cputime scaled by cpu frequency
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*/
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static void account_guest_time(struct task_struct *p, cputime_t cputime,
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cputime_t cputime_scaled)
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{
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u64 *cpustat = kcpustat_this_cpu->cpustat;
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/* Add guest time to process. */
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p->utime += cputime;
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p->utimescaled += cputime_scaled;
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account_group_user_time(p, cputime);
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p->gtime += cputime;
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/* Add guest time to cpustat. */
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if (TASK_NICE(p) > 0) {
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cpustat[CPUTIME_NICE] += (__force u64) cputime;
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cpustat[CPUTIME_GUEST_NICE] += (__force u64) cputime;
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} else {
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cpustat[CPUTIME_USER] += (__force u64) cputime;
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cpustat[CPUTIME_GUEST] += (__force u64) cputime;
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}
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}
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/*
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* Account system cpu time to a process and desired cpustat field
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* @p: the process that the cpu time gets accounted to
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* @cputime: the cpu time spent in kernel space since the last update
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* @cputime_scaled: cputime scaled by cpu frequency
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* @target_cputime64: pointer to cpustat field that has to be updated
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*/
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static inline
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void __account_system_time(struct task_struct *p, cputime_t cputime,
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cputime_t cputime_scaled, int index)
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{
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/* Add system time to process. */
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p->stime += cputime;
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p->stimescaled += cputime_scaled;
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account_group_system_time(p, cputime);
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/* Add system time to cpustat. */
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task_group_account_field(p, index, (__force u64) cputime);
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/* Account for system time used */
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acct_update_integrals(p);
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}
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/*
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* Account system cpu time to a process.
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* @p: the process that the cpu time gets accounted to
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* @hardirq_offset: the offset to subtract from hardirq_count()
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* @cputime: the cpu time spent in kernel space since the last update
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* @cputime_scaled: cputime scaled by cpu frequency
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*/
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void account_system_time(struct task_struct *p, int hardirq_offset,
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cputime_t cputime, cputime_t cputime_scaled)
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{
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int index;
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if ((p->flags & PF_VCPU) && (irq_count() - hardirq_offset == 0)) {
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account_guest_time(p, cputime, cputime_scaled);
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return;
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}
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if (hardirq_count() - hardirq_offset)
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index = CPUTIME_IRQ;
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else if (in_serving_softirq())
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index = CPUTIME_SOFTIRQ;
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else
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index = CPUTIME_SYSTEM;
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__account_system_time(p, cputime, cputime_scaled, index);
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}
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/*
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* Account for involuntary wait time.
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* @cputime: the cpu time spent in involuntary wait
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*/
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void account_steal_time(cputime_t cputime)
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{
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u64 *cpustat = kcpustat_this_cpu->cpustat;
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cpustat[CPUTIME_STEAL] += (__force u64) cputime;
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}
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/*
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* Account for idle time.
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* @cputime: the cpu time spent in idle wait
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*/
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void account_idle_time(cputime_t cputime)
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{
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u64 *cpustat = kcpustat_this_cpu->cpustat;
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struct rq *rq = this_rq();
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if (atomic_read(&rq->nr_iowait) > 0)
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cpustat[CPUTIME_IOWAIT] += (__force u64) cputime;
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else
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cpustat[CPUTIME_IDLE] += (__force u64) cputime;
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}
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static __always_inline bool steal_account_process_tick(void)
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{
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#ifdef CONFIG_PARAVIRT
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if (static_key_false(¶virt_steal_enabled)) {
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u64 steal, st = 0;
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steal = paravirt_steal_clock(smp_processor_id());
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steal -= this_rq()->prev_steal_time;
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st = steal_ticks(steal);
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this_rq()->prev_steal_time += st * TICK_NSEC;
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account_steal_time(st);
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return st;
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}
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#endif
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return false;
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}
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/*
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* Accumulate raw cputime values of dead tasks (sig->[us]time) and live
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* tasks (sum on group iteration) belonging to @tsk's group.
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*/
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void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
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{
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struct signal_struct *sig = tsk->signal;
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struct task_struct *t;
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times->utime = sig->utime;
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times->stime = sig->stime;
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times->sum_exec_runtime = sig->sum_sched_runtime;
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rcu_read_lock();
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/* make sure we can trust tsk->thread_group list */
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if (!likely(pid_alive(tsk)))
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goto out;
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t = tsk;
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do {
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times->utime += t->utime;
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times->stime += t->stime;
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times->sum_exec_runtime += task_sched_runtime(t);
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} while_each_thread(tsk, t);
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out:
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rcu_read_unlock();
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}
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#ifndef CONFIG_VIRT_CPU_ACCOUNTING
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#ifdef CONFIG_IRQ_TIME_ACCOUNTING
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/*
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* Account a tick to a process and cpustat
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* @p: the process that the cpu time gets accounted to
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* @user_tick: is the tick from userspace
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* @rq: the pointer to rq
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*
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* Tick demultiplexing follows the order
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* - pending hardirq update
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* - pending softirq update
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* - user_time
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* - idle_time
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* - system time
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* - check for guest_time
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* - else account as system_time
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*
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* Check for hardirq is done both for system and user time as there is
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* no timer going off while we are on hardirq and hence we may never get an
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* opportunity to update it solely in system time.
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* p->stime and friends are only updated on system time and not on irq
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* softirq as those do not count in task exec_runtime any more.
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*/
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static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
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struct rq *rq)
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{
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cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
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u64 *cpustat = kcpustat_this_cpu->cpustat;
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if (steal_account_process_tick())
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return;
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if (irqtime_account_hi_update()) {
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cpustat[CPUTIME_IRQ] += (__force u64) cputime_one_jiffy;
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} else if (irqtime_account_si_update()) {
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cpustat[CPUTIME_SOFTIRQ] += (__force u64) cputime_one_jiffy;
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} else if (this_cpu_ksoftirqd() == p) {
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/*
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* ksoftirqd time do not get accounted in cpu_softirq_time.
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* So, we have to handle it separately here.
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* Also, p->stime needs to be updated for ksoftirqd.
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*/
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__account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
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CPUTIME_SOFTIRQ);
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} else if (user_tick) {
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account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
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} else if (p == rq->idle) {
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account_idle_time(cputime_one_jiffy);
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} else if (p->flags & PF_VCPU) { /* System time or guest time */
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account_guest_time(p, cputime_one_jiffy, one_jiffy_scaled);
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} else {
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__account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
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CPUTIME_SYSTEM);
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}
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}
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static void irqtime_account_idle_ticks(int ticks)
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{
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int i;
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struct rq *rq = this_rq();
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for (i = 0; i < ticks; i++)
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irqtime_account_process_tick(current, 0, rq);
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}
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#else /* CONFIG_IRQ_TIME_ACCOUNTING */
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static void irqtime_account_idle_ticks(int ticks) {}
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static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
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struct rq *rq) {}
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#endif /* CONFIG_IRQ_TIME_ACCOUNTING */
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/*
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* Account a single tick of cpu time.
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* @p: the process that the cpu time gets accounted to
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* @user_tick: indicates if the tick is a user or a system tick
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*/
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void account_process_tick(struct task_struct *p, int user_tick)
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{
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cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
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struct rq *rq = this_rq();
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if (sched_clock_irqtime) {
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irqtime_account_process_tick(p, user_tick, rq);
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return;
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}
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if (steal_account_process_tick())
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return;
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if (user_tick)
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account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
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else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
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account_system_time(p, HARDIRQ_OFFSET, cputime_one_jiffy,
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one_jiffy_scaled);
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else
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account_idle_time(cputime_one_jiffy);
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}
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/*
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* Account multiple ticks of steal time.
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* @p: the process from which the cpu time has been stolen
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* @ticks: number of stolen ticks
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*/
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void account_steal_ticks(unsigned long ticks)
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{
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account_steal_time(jiffies_to_cputime(ticks));
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}
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/*
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* Account multiple ticks of idle time.
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* @ticks: number of stolen ticks
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*/
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void account_idle_ticks(unsigned long ticks)
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{
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if (sched_clock_irqtime) {
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irqtime_account_idle_ticks(ticks);
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return;
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}
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account_idle_time(jiffies_to_cputime(ticks));
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}
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#endif
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/*
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* Use precise platform statistics if available:
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*/
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING
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void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
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{
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*ut = p->utime;
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*st = p->stime;
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}
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void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
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{
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struct task_cputime cputime;
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thread_group_cputime(p, &cputime);
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*ut = cputime.utime;
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*st = cputime.stime;
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}
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void vtime_account_system_irqsafe(struct task_struct *tsk)
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{
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unsigned long flags;
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local_irq_save(flags);
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vtime_account_system(tsk);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL_GPL(vtime_account_system_irqsafe);
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#ifndef __ARCH_HAS_VTIME_TASK_SWITCH
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void vtime_task_switch(struct task_struct *prev)
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{
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if (is_idle_task(prev))
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vtime_account_idle(prev);
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else
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vtime_account_system(prev);
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|
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vtime_account_user(prev);
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arch_vtime_task_switch(prev);
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}
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#endif
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|
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/*
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* Archs that account the whole time spent in the idle task
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* (outside irq) as idle time can rely on this and just implement
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* vtime_account_system() and vtime_account_idle(). Archs that
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|
* have other meaning of the idle time (s390 only includes the
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|
* time spent by the CPU when it's in low power mode) must override
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* vtime_account().
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|
*/
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|
#ifndef __ARCH_HAS_VTIME_ACCOUNT
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void vtime_account(struct task_struct *tsk)
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|
{
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|
if (in_interrupt() || !is_idle_task(tsk))
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|
vtime_account_system(tsk);
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|
else
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|
vtime_account_idle(tsk);
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|
}
|
|
EXPORT_SYMBOL_GPL(vtime_account);
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|
#endif /* __ARCH_HAS_VTIME_ACCOUNT */
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|
|
|
#else
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|
|
|
#ifndef nsecs_to_cputime
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|
# define nsecs_to_cputime(__nsecs) nsecs_to_jiffies(__nsecs)
|
|
#endif
|
|
|
|
static cputime_t scale_utime(cputime_t utime, cputime_t rtime, cputime_t total)
|
|
{
|
|
u64 temp = (__force u64) rtime;
|
|
|
|
temp *= (__force u64) utime;
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|
|
|
if (sizeof(cputime_t) == 4)
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|
temp = div_u64(temp, (__force u32) total);
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|
else
|
|
temp = div64_u64(temp, (__force u64) total);
|
|
|
|
return (__force cputime_t) temp;
|
|
}
|
|
|
|
/*
|
|
* Adjust tick based cputime random precision against scheduler
|
|
* runtime accounting.
|
|
*/
|
|
static void cputime_adjust(struct task_cputime *curr,
|
|
struct cputime *prev,
|
|
cputime_t *ut, cputime_t *st)
|
|
{
|
|
cputime_t rtime, utime, total;
|
|
|
|
utime = curr->utime;
|
|
total = utime + curr->stime;
|
|
|
|
/*
|
|
* Tick based cputime accounting depend on random scheduling
|
|
* timeslices of a task to be interrupted or not by the timer.
|
|
* Depending on these circumstances, the number of these interrupts
|
|
* may be over or under-optimistic, matching the real user and system
|
|
* cputime with a variable precision.
|
|
*
|
|
* Fix this by scaling these tick based values against the total
|
|
* runtime accounted by the CFS scheduler.
|
|
*/
|
|
rtime = nsecs_to_cputime(curr->sum_exec_runtime);
|
|
|
|
if (total)
|
|
utime = scale_utime(utime, rtime, total);
|
|
else
|
|
utime = rtime;
|
|
|
|
/*
|
|
* If the tick based count grows faster than the scheduler one,
|
|
* the result of the scaling may go backward.
|
|
* Let's enforce monotonicity.
|
|
*/
|
|
prev->utime = max(prev->utime, utime);
|
|
prev->stime = max(prev->stime, rtime - prev->utime);
|
|
|
|
*ut = prev->utime;
|
|
*st = prev->stime;
|
|
}
|
|
|
|
void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
|
|
{
|
|
struct task_cputime cputime = {
|
|
.utime = p->utime,
|
|
.stime = p->stime,
|
|
.sum_exec_runtime = p->se.sum_exec_runtime,
|
|
};
|
|
|
|
cputime_adjust(&cputime, &p->prev_cputime, ut, st);
|
|
}
|
|
|
|
/*
|
|
* Must be called with siglock held.
|
|
*/
|
|
void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
|
|
{
|
|
struct task_cputime cputime;
|
|
|
|
thread_group_cputime(p, &cputime);
|
|
cputime_adjust(&cputime, &p->signal->prev_cputime, ut, st);
|
|
}
|
|
#endif
|