[PATCH] sched_rt: the task in irq context can be migrated during context switching

This issue happens under the following conditions 1. preemption is off 2. __ARCH_WANT_INTERRUPTS_ON_CTXSW is defined. 3. RT scheduling class 4. SMP system Sequence is as follows: 1.suppose current task is A. start schedule() 2.task A is enqueued ...

Message posted on the January 5th, 2012 - 6:10 AM ET

[PATCH 0/5 v3] perf events finer grained context instrumentation / context exclusion

Hi, In this new version, the weird hangs have been fixed. They were due to some ACTIVE state checks that didn't handle the paused mode. And also comes a new pmu->reserve callback to schedule an event on the cpu without actually starting it (as ...

Message posted on the June 12th, 2010 - 3:40 AM ET

[PATCH 1/5] RFC genirq: Add IRQ timestamping

This patch adds the IRQF_TIMESTAMP flag to register_threaded_irq() There are several drivers which record timestamps in their irq handlers. With the appearance of force_threaded irq handlers these timestamps will see higher jitter. So by moving the ...

Message posted on the March 21st, 2011 - 7:10 AM ET

Proper kernel irq time accounting -v4

Previous versions: -v0: http://lkml.indiana.edu/hypermail//linux/kernel/1005.3/00411.html lkml subject - "Finer granularity and task/cgroup irq time accounting" -v1: http://lkml.indiana.edu/hypermail//linux/kernel/1007.2/00987.html lkml ...

Message posted on the October 4th, 2010 - 8:10 PM ET

Bug#550333: INFO: task i915/0:2222 blocked

Package: linux-2.6 Version: 2.6.31-1~experimental.1 Severity: normal I have had a few crashes with the following described in the syslog. The exact appearance of the crash is not clear (the user was not able to give a good explanation other than ...

Message posted on the October 9th, 2009 - 6:10 AM ET

[RFD] Perf generic context based exclusion/inclusion (was Re: [PATCH 0/4] Finer granularity and task/cgroup irq time accounting)

Le 24 août 2010 10:14, Ingo Molnar <mingo@elte.hu> a écrit : * Peter Zijlstra <peterz@infradead.org> wrote: On Thu, 2010-07-22 at 19:12 -0700, Venkatesh Pallipadi wrote: > > > > Well, the task and cgroup ...

Message posted on the November 4th, 2010 - 10:50 AM ET

Proper kernel irq time accounting -v3

Previous versions: -v0: http://lkml.indiana.edu/hypermail//linux/kernel/1005.3/00411.html lkml subject - "Finer granularity and task/cgroup irq time accounting" -v1: http://lkml.indiana.edu/hypermail//linux/kernel/1007.2/00987.html lkml ...

Message posted on the September 29th, 2010 - 3:30 PM ET

[PATCH 0/6] Proper kernel irq time accounting

Here is some background information about interrupt time accounting in kernel and related problems Interrupts always run in the context of currently running task. Softirqs mostly run in the context of currently running task, unless softirqd gets ...

Message posted on the September 16th, 2010 - 10:00 PM ET

[PATCH] x86-32: don't switch to irq stack for a user-mode irq

From: Linus Torvalds <torvalds@linux-foundation.org> Date: Sun Feb 19 11:35:34 2012 -0800 x86-32: don't switch to irq stack for a user-mode irq If the irq happens in user mode, our kernel stack is empty (apart from the pt_regs themselves, of ...

Message posted on the February 19th, 2012 - 2:50 PM ET

[PATCH,RFC] perf: panic due to inclied cpu context task_ctx value

hi, following program triggers panic in the current tip tree. run it like: "while [ 1 ]; do ./ctx ; done" reproducer #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include ...

Message posted on the March 24th, 2011 - 11:50 AM ET

[PATCH RFC -tip 0/6] IRQ-bound performance events

Hello, This patchset is against perf/core branch. This is an an attempt to introduce IRQ-bound performance events - ones that only count in a context of a hardware interrupt handler. The aim is to measure events which can not be measured using ...

Message posted on the December 17th, 2012 - 7:00 AM ET

[PATCH 0/4] perf: Tasks and irq exclusion

Hi, The new task and irq exclusion handling can let you confine tracing and profiling to about everything you want. May be the only class of event I haven't tested yet is the breakpoints and non-tracepoint software events. Otherwise it works fine ...

Message posted on the May 21st, 2010 - 10:10 AM ET

BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1081

The oops below happened today with v2.6.37-rc5-62-g6313e3c with the following hpet oneline fix which should be unrelated (tglx has an equivalent one in -tip/urgent already): diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c index ...

Message posted on the December 14th, 2010 - 4:50 AM ET

interrupt context & current

Hi, I'm working on an XScale based platfrom with 2.6.18-rt5 kernel and there is a strange issue with interrupts going on which I need to debug. In the interrupt context, it is possible to access current? I'd like to know which task was preempted ...

Message posted on the September 17th, 2009 - 5:25 AM ET

task irq context