Please do not quote on this... I read these thing from a 2.2 kernel book. > > As per my knowledge the default page size is 4K . It is true > > Do you mean to say the ZONE_NORMAL pages are of 4MB > size ? > Yes. Swapper_pg_dir stores ZONE_NORMAL pages as 4MB. There is no page tables For this area. Linux make use of the 4MB page capability of intel pentium Processors. There is a flag in the page global directory saying that the page it points is a 4MB page. Does any one have a different opition on this ? > I'am aware that kmalloc() should be used for smaller > sizes , but would it not be a huge waste & be a cause > of internal fragmentation if vmalloc() were to > allocate 4MB pages ? Vmalloc() allocates 4KB pages only, that is the minimum size and it could only allocate in multiple of 4K. Vmalloc area is above ZONE_NORMAL. While kmalloc() returns an address inside ZONE_NORMAL and the size of the allocated area is nothing to do with the page size. Does any one have a different opition on this ? > > Could somebody please confirm . > > Cheers > > > > > > _______________________________ > Do you Yahoo!? > Declare Yourself - Register online to vote today! > http://vote.yahoo.com > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
