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/linux-6.8/include/trace/events/
Dirq.h103 DECLARE_EVENT_CLASS(softirq,
122 * softirq_entry - called immediately before the softirq handler
123 * @vec_nr: softirq vector number
126 * we can determine the softirq handler routine.
128 DEFINE_EVENT(softirq, softirq_entry,
136 * softirq_exit - called immediately after the softirq handler returns
137 * @vec_nr: softirq vector number
140 * we can determine the softirq handler routine.
142 DEFINE_EVENT(softirq, softirq_exit,
150 * softirq_raise - called immediately when a softirq is raised
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/linux-6.8/kernel/
Dsoftirq.c3 * linux/kernel/softirq.c
38 - If a softirq needs serialization, let it serialize itself
40 - Even if softirq is serialized, only local cpu is marked for
46 - NET RX softirq. It is multithreaded and does not require
48 - NET TX softirq. It kicks software netdevice queues, hence
72 * the softirq load for us.
96 * - count is changed by SOFTIRQ_OFFSET on entering or leaving softirq
103 * softirq and whether we just have bh disabled.
110 * softirq disabled section to be preempted.
117 * the task which is in a softirq disabled section is preempted or blocks.
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Duser.c102 * occasionally also taken from softirq/tasklet context, when
103 * task-structs get RCU-freed. Hence all locking must be softirq-safe.
106 * softirq callbacks, and they can unconditionally enable interrupts, and
/linux-6.8/fs/proc/
Dstat.c85 u64 user, nice, system, idle, iowait, irq, softirq, steal; in show_stat() local
93 irq = softirq = steal = 0; in show_stat()
111 softirq += cpustat[CPUTIME_SOFTIRQ]; in show_stat()
133 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq)); in show_stat()
152 softirq = cpustat[CPUTIME_SOFTIRQ]; in show_stat()
163 seq_put_decimal_ull(p, " ", nsec_to_clock_t(softirq)); in show_stat()
185 seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq); in show_stat()
/linux-6.8/Documentation/RCU/
DUP.rst15 Example 1: softirq Suicide
20 this same list in softirq context. Suppose that the process-context scan
21 is referencing element B when it is interrupted by softirq processing,
26 from softirq, the list scan would find itself referencing a newly freed
134 then, since RCU callbacks can be invoked from softirq context,
135 the callback might be called from a softirq that interrupted
Dstallwarn.rst57 is running at a higher priority than the RCU softirq threads.
73 prevent RCU's kthreads and softirq handlers from running.
232 2-...: (3 GPs behind) idle=06c/0/0 softirq=1453/1455 fqs=0
233 16-...: (0 ticks this GP) idle=81c/0/0 softirq=764/764 fqs=0
260 The "softirq=" portion of the message tracks the number of RCU softirq
268 across repeated stall-warning messages, it is possible that RCU's softirq
271 kernels, if a high-priority process is starving RCU's softirq handler.
337 Possible timer handling issue on cpu=4 timer-softirq=11142
340 where it queued the fqs timer. The number following the "timer-softirq"
454 result in softirq execution are confined to other CPUs. In this case,
Dchecklist.rst198 the callback function may be invoked from softirq context,
235 and re-enables softirq, for example, rcu_read_lock_bh() and
266 network-driver NAPI (softirq) context. BPF relies heavily on RCU
371 with softirq disabled, e.g., via spin_lock_bh(). Failing to
372 disable softirq on a given acquisition of that lock will result
373 in deadlock as soon as the RCU softirq handler happens to run
402 might be concurrently invoked by that CPU's softirq handler and
/linux-6.8/kernel/trace/
Dtrace_osnoise.c213 struct osn_softirq softirq; member
379 osn_var->softirq.arrival_time = 0; in timerlat_softirq_exit()
380 osn_var->softirq.delta_start = 0; in timerlat_softirq_exit()
428 seq_puts(s, "# || / _----=> hardirq/softirq\n"); in print_osnoise_headers()
456 seq_puts(s, "# | / _---=> hardirq/softirq\n"); in print_osnoise_headers()
544 seq_puts(s, "# || / _----=> hardirq/softirq\n"); in print_timerlat_headers()
560 seq_puts(s, "# | / _---=> hardirq/softirq\n"); in print_timerlat_headers()
728 * cond_move_softirq_delta_start - Forward the delta_start of a running softirq.
730 * If a softirq is preempted by an IRQ or NMI, its delta_start is pushed
738 if (osn_var->softirq.delta_start) in cond_move_softirq_delta_start()
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/linux-6.8/Documentation/locking/
Dlockdep-design.rst55 - softirq
88 ||| \-> softirq disabled and not in softirq context
89 || \--> acquired in softirq context
120 A softirq-unsafe lock-class is automatically hardirq-unsafe as well. The
125 <softirq-safe> or <softirq-unsafe>
160 <softirq-safe> -> <softirq-unsafe>
164 thus could result in a lock inversion deadlock. Likewise, a softirq-safe
165 lock could be taken by an softirq context, interrupting a softirq-unsafe
178 - if a new softirq-safe lock is discovered, we check whether it took
179 any softirq-unsafe lock in the past.
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/linux-6.8/Documentation/translations/it_IT/kernel-hacking/
Dlocking.rst173 Sincronizzazione fra il contesto utente e i softirq
176 Se un softirq condivide dati col contesto utente, avete due problemi.
177 Primo, il contesto utente corrente potrebbe essere interroto da un softirq,
180 (``include/linux/spinlock.h``) viene utilizzato. Questo disabilita i softirq
192 (``include/linux/interrupt.h``), la quale impedisce ai softirq d'essere
198 Questo caso è uguale al precedente, un tasklet viene eseguito da un softirq.
204 softirq.
229 Sincronizzazione fra softirq
232 Spesso un softirq potrebbe condividere dati con se stesso o un tasklet/timer.
234 Lo stesso softirq argument
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Dhacking.rst40 - non associata ad alcun processo, servendo un softirq o tasklet;
50 softirq è in esecuzione su d'una CPU, nessun altro softirq può avvicendarsi
77 Attenzione che se avete la prelazione o i softirq disabilitati (vedere
101 Contesto d'interruzione software: softirq e tasklet
107 eseguita (``kernel/softirq.c``).
116 Il file ``include/linux/interrupt.h`` elenca i differenti tipi di 'softirq'.
117 Un tipo di softirq molto importante è il timer (``include/linux/timer.h``):
121 Dato che i softirq possono essere eseguiti simultaneamente su più di un
134 Potete determinate se siete in un softirq (o tasklet) utilizzando la
432 Lo scopo è di prevenire l'esecuzione di softirq e tasklet sul processore
/linux-6.8/Documentation/kernel-hacking/
Dlocking.rst164 If a softirq shares data with user context, you have two problems.
165 Firstly, the current user context can be interrupted by a softirq, and
180 (``include/linux/interrupt.h``), which protects you from the softirq
187 from a softirq.
193 from a softirq. From a locking point of view, tasklets and timers are
221 Often a softirq might want to share data with itself or a tasklet/timer.
223 The Same Softirq
226 The same softirq can run on the other CPUs: you can use a per-CPU array
228 going so far as to use a softirq, you probably care about scalable
239 tasklet, different softirq or the same or another softirq: any of them
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/linux-6.8/kernel/locking/
Dlockdep_proc.c157 [LOCK_CHAIN_SOFTIRQ_CONTEXT] = "softirq", in lc_show()
159 LOCK_CHAIN_HARDIRQ_CONTEXT] = "hardirq|softirq", in lc_show()
224 seq_printf(m, " softirq on events: %11llu\n", si1); in lockdep_stats_debug_show()
225 seq_printf(m, " softirq off events: %11llu\n", si2); in lockdep_stats_debug_show()
226 seq_printf(m, " redundant softirq ons: %11llu\n", sr1); in lockdep_stats_debug_show()
227 seq_printf(m, " redundant softirq offs: %11llu\n", sr2); in lockdep_stats_debug_show()
319 seq_printf(m, " in-softirq chains: %11u\n", in lockdep_stats_show()
341 seq_printf(m, " softirq-safe locks: %11lu\n", in lockdep_stats_show()
343 seq_printf(m, " softirq-unsafe locks: %11lu\n", in lockdep_stats_show()
354 seq_printf(m, " softirq-read-safe locks: %11lu\n", in lockdep_stats_show()
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/linux-6.8/arch/sh/kernel/
Dirq.c93 * Copy the softirq bits in preempt_count so that the in handle_one_irq()
94 * softirq checks work in the hardirq context. in handle_one_irq()
118 * allocate per-cpu stacks for hardirq and for softirq processing
164 /* build the stack frame on the softirq stack */ in do_softirq_own_stack()
170 /* switch to the softirq stack */ in do_softirq_own_stack()
/linux-6.8/lib/
Dlocking-selftest.c193 * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests.
194 * The following functions use a lock from a simulated hardirq/softirq
195 * context, causing the locks to be marked as hardirq-safe/softirq-safe:
818 #include "locking-selftest-spin-softirq.h" in GENERATE_PERMUTATIONS_2_EVENTS()
821 #include "locking-selftest-rlock-softirq.h" in GENERATE_PERMUTATIONS_2_EVENTS()
824 #include "locking-selftest-wlock-softirq.h" in GENERATE_PERMUTATIONS_2_EVENTS()
833 * Enabling hardirqs with a softirq-safe lock held: in GENERATE_PERMUTATIONS_2_EVENTS()
896 #include "locking-selftest-spin-softirq.h"
899 #include "locking-selftest-rlock-softirq.h"
902 #include "locking-selftest-wlock-softirq.h"
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Dirq_poll.c25 * raise of the blk iopoll softirq.
91 * If softirq window is exhausted then punt. in irq_poll_softirq()
192 * set the POLL softirq bit. The local_bh_disable()/enable() pair in irq_poll_cpu_dead()
194 * reach idle with the POLL softirq pending. in irq_poll_cpu_dead()
/linux-6.8/include/linux/
Dtrace_recursion.h56 * if a softirq interrupted the start of graph tracing,
58 * tracing in the softirq, and depth can even be 3
60 * that preempted a softirq start of a function that
106 * SOFTIRQ = 2
Dhrtimer.h152 * @softirq_activated: displays, if the softirq is raised - update of softirq
158 * @softirq_expiry_lock: Lock which is taken while softirq based hrtimer are
168 * @softirq_next_timer: Pointer to the first expiring softirq based timer
375 * softirq based mode is considered for debug purpose only!
Dpreempt.h15 * We put the hardirq and softirq counter into the preemption
19 * - bits 8-15 are the softirq count (max # of softirqs: 256)
86 * 1 - softirq context
123 * in_serving_softirq() - We're in softirq context
139 * in_interrupt() - We're in NMI,IRQ,SoftIRQ context or have BH disabled
Dinterrupt.h559 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */
579 /* map softirq index to softirq name. update 'softirq_to_name' in
580 * kernel/softirq.c when adding a new softirq.
584 /* softirq mask and active fields moved to irq_cpustat_t in
830 * We want to know which function is an entrypoint of a hardirq or a softirq.
/linux-6.8/arch/s390/kernel/
Dvtime.c127 u64 timer, clock, user, guest, system, hardirq, softirq; in do_account_vtime() local
159 softirq = update_tsk_timer(&tsk->thread.softirq_timer, in do_account_vtime()
162 clock - user - guest - system - hardirq - softirq; in do_account_vtime()
179 if (softirq) in do_account_vtime()
180 account_system_index_scaled(tsk, softirq, CPUTIME_SOFTIRQ); in do_account_vtime()
182 return virt_timer_forward(user + guest + system + hardirq + softirq); in do_account_vtime()
/linux-6.8/Documentation/timers/
Dhighres.rst176 red-black tree to a separate double linked list and invokes the softirq
183 context to the softirq and to the task which is woken up by the expired
199 The softirq for running the hrtimer queues and executing the callbacks has been
200 separated from the tick bound timer softirq to allow accurate delivery of high
202 timers. The execution of this softirq can still be delayed by other softirqs,
/linux-6.8/include/net/
Dcls_cgroup.h58 * packets originating from softirq context as accessing `current' in task_get_classid()
62 * disable bh. Knowing this, it is possible to detect softirq based in task_get_classid()
/linux-6.8/drivers/gpu/drm/i915/
Di915_scheduler.h84 local_bh_disable(); /* prevent local softirq and lock recursion */ in i915_sched_engine_active_lock_bh()
92 local_bh_enable(); /* restore softirq, and kick ksoftirqd! */ in i915_sched_engine_active_unlock_bh()
/linux-6.8/include/net/page_pool/
Dtypes.h34 * this array, as it shares the same softirq/NAPI protection. If
144 /* these stats are incremented while in softirq context */
158 * Softirq/BH scheduling and napi_schedule. NAPI schedule

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