• D
    [PATCH] x86: enable VMSPLIT for highmem kernels · 753b9f86
    Dave Hansen 提交于
    The current VMSPLIT Kconfig option is disabled whenever highmem is on.
    This is a bit screwy because the people who need to change VMSPLIT the most
    tend to be the ones with highmem and constrained lowmem.
    
    So, remove the highmem dependency.  But, re-include the dependency for the
    "full 1GB of lowmem" option.  You can't have the full 1GB of lowmem and
    highmem because of the need for the vmalloc(), kmap(), etc...  areas.
    
    I thought there would be at least a bit of tweaking to do to
    get it to work, but everything seems OK.
    
    Boot tested on a 4GB x86 machine, and a 12GB 3-node NUMA-Q:
    
    elm3b82:~# cat /proc/meminfo
    MemTotal:      3695412 kB
    MemFree:       3659540 kB
    ...
    LowTotal:      2909008 kB
    LowFree:       2892324 kB
    ...
    elm3b82:~# zgrep PAE /proc/config.gz
    CONFIG_X86_PAE=y
    
    larry:~# cat /proc/meminfo
    MemTotal:     11845900 kB
    MemFree:      11786748 kB
    ...
    LowTotal:      2855180 kB
    LowFree:       2830092 kB
    Signed-off-by: NDave Hansen <haveblue@us.ibm.com>
    Signed-off-by: NAndrew Morton <akpm@osdl.org>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    753b9f86
Kconfig 37.9 KB