On 21-11-07 21:12, Rene Herman wrote:
On 21-11-07 04:44, Talib Alim wrote:
Either that or somehow arrange that you'll never be passed a highmem
page to begin with as highmem pages by their nature of not being
permanently mapped do not _have_ a virtual address until after
they're mapped.
How would you arrange so I am passed a higmem page ?
Assumed "not passed". Depends. As said, in the block layer it's a matter
of not telling anyone you know what highmem is. I don't know if/how
other subsystems provide for it.
Due to another kernelnewbies post just now I noticed I should probably also
point you to the VMSPLIT options that are available since a few kernel
versions. On your 2G machine, you could pick VMSPLIT_2G_OPT through the
kernel config after which no such thing as highmem exists anymore which
would ofcourse be an effective way of arranging not being passed any.
Whether or not it's a good idea depends. If you're running, say, large
databases that want large address-spaces, it's not. Also things such as
vmware may crap out...
Rene.
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