Hardirq_offset

Author: gugg

August undefined, 2024

WebLKML Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH 0/5] irq: Reorder time handling against HARDIRQ_OFFSET on IRQ entry v3 @ 2024-12-02 11:57 … http://visa.lab.asu.edu/gitlab/fstrace/android-kernel-msm-hammerhead-3.4-marshmallow-mr3/blob/151db1fc23800875c7ac353b106b7dab77061275/include/linux/hardirq.h

include/linux/hardirq.h · …

Web* @hardirq_offset: the offset to subtract from hardirq_count() * @cputime: the CPU time spent in kernel space since the last update void account_system_time ( struct task_struct *p, int hardirq_offset, u64 cputime) WebApr 10, 2024 · 49 __local_bh_enable (SOFTIRQ_OFFSET); 50 … 51} 第14行代码，把局部变量pending设置为当前处理器的待处理软中断位图。第16行代码，把抢占计数器的软中断计数加1。第20行代码，把当前处理器的待处理软中断位图重新设置为0。第22行代码，开启硬 … clip on bun hairpieces

LKML: riel@redhat ...: [PATCH 4/5] irqtime: add irq type parameter …

WebLinux kernel for Nexus 5 (hammerhead) Toggle navigation Toggle navigation pinning Webdoesn't get preempted after we substract the HARDIRQ_OFFSET until we are entirely done with any code in irq_exit(). This workaround was necessary because some archs may call irq_exit() with irqs enabled and there is still some code … WebDec 4, 2024 · After we add HARDIRQ_OFFSET to preempt_count, the "in_interrupt()" will be set and the function tracer will know its in a new context where its safe to continue tracing. Can you try this patch to see if it fixes it for you?-- Steve diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h clip on bun

LKML: Frederic Weisbecker: Re: Linux 6.3-rc2

Web[PATCH 15/23] hardirq: Split preempt count mask definitions From: Frederic Weisbecker Date: Wed Jul 31 2013 - 20:37:53 EST Next message: Frederic Weisbecker: "[PATCH 11/23] context_tracking: User/kernel broundary cross trace events" Previous message: Joe Perches: "[PATCH 3/8] af_rxrpc.h: Remove extern from function prototypes" In reply to: … WebHello all! Kernel version : 2.6.18. Arch : i386. With the following conditions, it is possible that softirqs are. executed in a interrupt context rather than process one. 1) CONFIG_4KSTACKS ----> ON. That means the dedicated IRQ stack is used for hardirq handler. 2) there exist some Hard IRQ which allows interupt enabled when its. clip on bun hairpieceWebIntroduction ¶. The generic interrupt handling layer is designed to provide a complete abstraction of interrupt handling for device drivers. It is able to handle all the different … clip on bug repellent

"WebThe only downside is that the early entry code up to irq_enter_rcu() must be aware that the preemption count has not yet been updated with the HARDIRQ_OFFSET state. Note … " - Hardirq_offset

Hardirq_offset

Did you know?

WebSubtract HARDIRQ_OFFSET from preempt_count, undoing the previous addition. If this interrupt is not recursive there are no softirq’s in execution on this CPU, and there are pending softirqs, cal do_softirq Return to entry.S. Back in entry.S, again running with IF=0, this irq re-enabled in PIC, and original preempt_count: WebAdd HARDIRQ_OFFSET to preempt_count for this thread, making this execution non-preemptible. This step is not covered in Love. This elevated preempt_count is also how …

WebSep 15, 2004 · the attached patch is a new approach to get rid of Linux's Big Kernel Lock as we know it today. The trick is to turn the BKL spinlock + depth counter into a special type of cpu-affine, recursive semaphore, which gets released by schedule () but not by preempt_schedule (). this gives the following advantages: - BKL critical sections are fully ... Web* We put the hardirq and softirq counter into the preemption * counter. The bitmask has the following meaning: * * - bits 0-7 are the preemption count (max preemption depth: 256) * - bits 8-15 are the softirq count (max # of softirqs: 256) * * The hardirq count could in theory be the same as the number of

WebMar 11, 2024 · The desired outcome is to remove the nasty hack that prevents softirqs from being raised through ksoftirqd instead of the hardirq bottom half. Also tick_irq_enter() … WebThe only downside is that the early entry code up to irq_enter_rcu() must be aware that the preemption count has not yet been updated with the HARDIRQ_OFFSET state. Note that irq_exit_rcu() must remove HARDIRQ_OFFSET from the preemption count before it handles soft interrupts, whose handlers must run in BH context rather than irq-disabled context.

WebMar 13, 2024 · kernel_xiaomi_alioth - Android linux kernel for Redmi K40. Merged CLO/ACK code, imported Xiaomi driver code.

Web* preempt_count and SOFTIRQ_OFFSET usage: * - preempt_count is changed by SOFTIRQ_OFFSET on entering or leaving * softirq processing. * - preempt_count is changed by SOFTIRQ_DISABLE_OFFSET (= 2 * SOFTIRQ_OFFSET) * on local_bh_disable or local_bh_enable. * This lets us distinguish between whether we are … bobrick multifold dispenserWebFeb 2, 2008 · [PATCH] fix boot-time hangs from PREEMPT_RCU and NO_HZ From: Paul E. McKenney Date: Thu Feb 28 2008 - 23:44:05 EST Next message: Roman Zippel: "[PATCH] Remove obsolete CLOCK_TICK_ADJUST" Previous message: Stephen Rothwell: "linux-next: semaphore update merge conflicts" Next in thread: Andrew Morton: "Re: … clip on bulb lamp shades smallWebWarning: not a merge-ready in any sense As discussed, softirqs will be deferred or processed right away according to how much time this type of softirq spent on CPU. clip on bunk bed shelf