• Benjamin Herrenschmidt's avatar
    [POWERPC] vmemmap fixes to use smaller pages · cec08e7a
    Benjamin Herrenschmidt authored
    This changes vmemmap to use a different region (region 0xf) of the
    address space, and to configure the page size of that region
    dynamically at boot.
    
    The problem with the current approach of always using 16M pages is that
    it's not well suited to machines that have small amounts of memory such
    as small partitions on pseries, or PS3's.
    
    In fact, on the PS3, failure to allocate the 16M page backing vmmemmap
    tends to prevent hotplugging the HV's "additional" memory, thus limiting
    the available memory even more, from my experience down to something
    like 80M total, which makes it really not very useable.
    
    The logic used by my match to choose the vmemmap page size is:
    
     - If 16M pages are available and there's 1G or more RAM at boot,
       use that size.
     - Else if 64K pages are available, use that
     - Else use 4K pages
    
    I've tested on a POWER6 (16M pages) and on an iSeries POWER3 (4K pages)
    and it seems to work fine.
    
    Note that I intend to change the way we organize the kernel regions &
    SLBs so the actual region will change from 0xf back to something else at
    one point, as I simplify the SLB miss handler, but that will be for a
    later patch.
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    cec08e7a
pgtable-ppc64.h 14.1 KB