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Re: sched: horrible way to detect whether a task has been preempted

From Jiri Kosina <jikos@kernel.org>
Newsgroups linux.kernel
Subject Re: sched: horrible way to detect whether a task has been preempted
Date 2016-04-08 01:00 +0200
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On Thu, 7 Apr 2016, Josh Poimboeuf wrote:

> To do that from C code, I guess we'd still need some arch-specific code
> in an asm() statement to do the actual push?

This could potentially be worked around I believe (thinking for example of 
a onstack-allocated local variable with predefined contents that the 
compiler would not be allowed to optimize out; certainly not the only 
option).

Thanks,

-- 
Jiri Kosina
SUSE Labs

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Thread

Re: sched: horrible way to detect whether a task has been preempted Jessica Yu <jeyu@redhat.com> - 2016-04-07 23:20 +0200
  Re: sched: horrible way to detect whether a task has been  preempted Jiri Kosina <jikos@kernel.org> - 2016-04-07 23:40 +0200
    Re: sched: horrible way to detect whether a task has been preempted Josh Poimboeuf <jpoimboe@redhat.com> - 2016-04-08 00:40 +0200
      Re: sched: horrible way to detect whether a task has been  preempted Jiri Kosina <jikos@kernel.org> - 2016-04-08 01:00 +0200
    Re: sched: horrible way to detect whether a task has been preempted Jessica Yu <jeyu@redhat.com> - 2016-04-08 01:20 +0200
      Re: sched: horrible way to detect whether a task has been  preempted Jiri Kosina <jikos@kernel.org> - 2016-04-08 09:10 +0200
        Re: sched: horrible way to detect whether a task has been preempted Petr Mladek <pmladek@suse.com> - 2016-04-08 10:10 +0200
          Re: sched: horrible way to detect whether a task has been preempted Josh Poimboeuf <jpoimboe@redhat.com> - 2016-04-08 16:40 +0200
            Re: sched: horrible way to detect whether a task has been preempted Petr Mladek <pmladek@suse.com> - 2016-04-11 10:40 +0200

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