TRACE_SOFTIRQ_ENTRY(9) IRQ TRACE_SOFTIRQ_ENTRY(9)NAME
trace_softirq_entry - called immediately before the softirq handler
SYNOPSIS
void trace_softirq_entry(struct softirq_action * h, struct softirq_action * vec);
ARGUMENTS
h
pointer to struct softirq_action
vec
pointer to first struct softirq_action in softirq_vec array
DESCRIPTION
The h parameter, contains a pointer to the struct softirq_action which has a pointer to the action handler that is called. By subtracting
the vec pointer from the h pointer, we can determine the softirq number. Also, when used in combination with the softirq_exit tracepoint we
can determine the softirq latency.
AUTHORS
Jason Baron <jbaron@redhat.com>
Author.
William Cohen <wcohen@redhat.com>
Author.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 TRACE_SOFTIRQ_ENTRY(9)
Check Out this Related Man Page
DEL_TIMER_SYNC(9) Driver Basics DEL_TIMER_SYNC(9)NAME
del_timer_sync - deactivate a timer and wait for the handler to finish.
SYNOPSIS
int del_timer_sync(struct timer_list * timer);
ARGUMENTS
timer
the timer to be deactivated
DESCRIPTION
This function only differs from del_timer on SMP: besides deactivating the timer it also makes sure the handler has finished executing on
other CPUs.
SYNCHRONIZATION RULES
Callers must prevent restarting of the timer, otherwise this function is meaningless. It must not be called from interrupt contexts unless
the timer is an irqsafe one. The caller must not hold locks which would prevent completion of the timer's handler. The timer's handler must
not call add_timer_on. Upon exit the timer is not queued and the handler is not running on any CPU.
NOTE
For !irqsafe timers, you must not hold locks that are held in interrupt context while calling this function. Even if the lock has nothing
to do with the timer in question. Here's why:
CPU0 CPU1 ---- ---- <SOFTIRQ> call_timer_fn; base->running_timer = mytimer; spin_lock_irq(somelock); <IRQ> spin_lock(somelock);
del_timer_sync(mytimer); while (base->running_timer == mytimer);
Now del_timer_sync will never return and never release somelock. The interrupt on the other CPU is waiting to grab somelock but it has
interrupted the softirq that CPU0 is waiting to finish.
The function returns whether it has deactivated a pending timer or not.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 DEL_TIMER_SYNC(9)
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