Hello Mulyadi, On Tue, Jul 10, 2012 at 9:42 PM, Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx> wrote: > Hi.. > > On Tue, Jul 10, 2012 at 6:51 PM, Arun KS <getarunks@xxxxxxxxx> wrote: >> Hello Experts, >> >> I have a requirement to change __log_buf memory(kernel printk buffer) >> as non cacheable memory. >> How can I change the page attributes for changing cache policy to non cacheable? > > I just can give short clue. I think somehow you must find its PTE > entry...there, IIRC there is page attribute that can be changed to > make it uncacheable. > > cross check the Intel processor manual for further clarification (if > it's indeed x86 arch) __log_buf size is 512KB and PTE is mapped to a 1MB section. So if I change the attribute for this 1MB section, lot of other stuffs(in this 1MB bss section) will also become non-cachable. Looks like it is not possible unless my __log_buf is 1MB in size. Or I need to create another section like .init, .data, .bss and create 4KB pages(with two levels of Page Tables) instead of 1M section. My arch is arm-v7 Thanks, Arun > > -- > regards, > > Mulyadi Santosa > Freelance Linux trainer and consultant > > blog: the-hydra.blogspot.com > training: mulyaditraining.blogspot.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
