Interception for a resource based scheduler

From: selvakumar nagendran (kernelselva_at_yahoo.com)
Date: 12/31/04

  • Next message: Jesse Allen: "Re: ptrace single-stepping change breaks Wine" 
    Date:	Thu, 30 Dec 2004 22:51:36 -0800 (PST)
To: Arjan van de Ven <arjan@infradead.org>

    hi,
      I am using these information for the scheduler I am
    developing in Linux. The scheduler selects the next
    process to run based on the resources needed so that a
    high priority process will not starve for a semaphore
    key, file lock etc that were acquired by a low
    priority process. The user may change the file
    descriptor only through syscalls. If I intercept them
    and update the resource history that I am maintaining,
    then will the information break?

    Thanks,
    selva

    --- Arjan van de Ven <arjan@infradead.org> wrote:

    > On Thu, 2004-12-30 at 04:13 -0800, selvakumar
    > nagendran wrote:
    > >
    > > Thanks for ur help. The user will be changing
    > > this using system calls like dup,dup2 etc. If I
    > keep
    > > track of all these modifications by intercepting
    > all
    > > those syscalls and use inode number for
    > identifying
    > > the structure uniquely, will it break?
    >
    > it sure is not a reliable method. The user can
    > change the fd's YOU log.
    > So your logging is inaccurate. That may or may not
    > be a problem, it
    > depends on what the application of this is.
    >
    >
    >

                    
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