Hi! On 14:03 Wed 14 Jul , Kulikov Vasiliy wrote: > Hi folks, > > I wonder whether any kernel code is swapped out in some cases? E.g. in > windows NT kernel kernel code is divided into two parts - swappable and > nonswappable, there is specific macros to mark the code being swappable. > > So, as I understand, all kernel code (including modules) and all > static/global data is unswappable, all dynamic memory allocated with > GFP_ATOMIC is unswappable, with GFP_KERNEL is swappable. Am I right? No, GFP_KERNEL is not swappable and I am not aware of any kernel memory which is. This flag determines the behaviour when allocating memory: GFP_ATOMIC fail immediately, if no memory is available; This is needed is some cases where the code cannot sleep (e.g. interrupt context) GFP_KERNEL put the code to sleep and try to free memory e.g. by swapping user space memory to disk; However, this does not mean that allocations are always successful either. -Michi -- programing a layer 3+4 network protocol for mesh networks see http://michaelblizek.twilightparadox.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
