On Wednesday 17 August 2005 21:54, Jan Hudec wrote: > On Wed, Aug 17, 2005 at 12:32:11 +0000, Vincenzo Mallozzi wrote: > > I've also expanded swap memory to include all of the data structures my module > > creates (up to 3.7 GB). > > And did you also teach the module to swap the data? No, I'm not because initially I just think that also kernel data can be swapped out. And then I read from "Understanding Linux Kernel" and other books that the swapout() function acts only on processes address space. > Again, why do the data need to be in kernel. I am not saying there is no > reason for it, but could you explain what you are doing a bit? There may be > another solution. Oh, yes. There's no reason for maintaining data in kernel-space but I know that allocation , from within a kernel module, happens by means of kmalloc, vmalloc and get_free_pages functions but all of these allocate memory in kernel space as they are called from within a kernel module. Now, I briefly explain what I'm doing. I'm creating a kernel module by which I do various checkpoint of some threads I'm monitoring. I've to create various system state, each of which contains a snapshot of the system at any instant. In other word, I've two data structures, one containing usefull info about task_struct of each thread and the other containing usefull information about shared memory descriptor (and related vmas). this two data structures are contained in a greter data structures the describes each state of the system. I've to create such a state when some events occur (I'll not describe the events that have to occur. they're not important for the sake of module description). After I've created such a state, I've to push it on a stack. The problem is that after the creation of some states, system memory will going to empty. So I need to flush the contents of the stack on disk and consequently free memory. I do it monitoring the memory used by the system. I hope I've well explained my problem but I don't know how I can allocate this memory in Userland from within a module. I'm very grateful to you for the moral and technical support you gave me. Thanks. Vincenzo Mallozzi. ___________________________________ Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB http://mail.yahoo.it -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
