On Mon, May 19, 2008 at 6:57 PM, Alexei Babich <a.babich@xxxxxx> wrote: > Hi all, > How I can disable printk() output bufferization ? I need that printk() prints symbol-by-symbol or line-by-line. > Check this out - since it has similar embedded requirements like yours (what is a chematic engineer?): http://tree.celinuxforum.org/pipermail/celinux-dev/2006-July/001261.html Read the comments part of kernel/printk.c - printk() is an amazing function, because it can be called in ANY CONTEXT.....which also means that it cannot sleep. But since u know many I/O function involved some form of waiting, therefore printk() necessarily HAVE TO WRITE TO A BUFFER, and it only write to the screen/console whenever it is allowed to sleep (which involved holding a console semaphore). In short, printk() sometimes will output to screen directly, esp when u are not in the interrupt context. Otherwise it may just buffer for later delivery. > Thank you. > -- > Regards, > Alexei Babich, chematic engineer, OOO NPP "Rezonans", Chelyabinsk, Russia > http://www.rez.ru > Jabber ID: impatt@xxxxxxxxx > -- -- Regards, Peter Teoh -- To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs
