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Message-ID: <20050107041354.45351.qmail@web60603.mail.yahoo.com>
Date: Thu, 6 Jan 2005 20:13:54 -0800 (PST)
From: selvakumar nagendran <kernelselva@yahoo.com>
Subject: Re: finding process blocking on a system call 
To: lkml.ThinkingInBinary@spamgourmet.org
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <e4cb1987050106133642b931ce@mail.gmail.com>
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> You can't both block but have it added to the
> runqueue--blocking means
> it does not run... you either need to use
> non-blocking calls or two
> threads.  If you want to find the process, top can
> do this
> (interactively) or you can use the /proc filesystem.
> 

Hello,
   I accept that we can't have a process both blocked
and in the runqueue. See, I want to give a special
state to the process blocked on a particular resource
like semaphore as TASK_BLOCKED and I will not add it
into the wait queue. 
   If the scheduler picks up this blocked process
again, I will identify the process that is having the
semaphore and I will run that.  with this, I am giving
some timeslice of the blocked process to the process
having that resource so that it can release it soon.
  So, if a process blocks on the syscall, I will
change the state as TASK_MYSTATE. Since, a process may
block on a system call for many reasons, I am not able
to clearly figure out how can I do that? Can u help me
regarding this?

Thanks,
selva


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