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SubjectRe: Raid 0 Swap?

>> I thought kernel data weren't swapped at all?

If the swap code was swapped, who would swap it in again?

>Well, it's not that simple. Kernel uses both swappable and
>non-swappable memory internally. For some things, it's
>unswappable, for some, it's swappable. In general, it's
>impossible to say which parts of kernel will break (and
>in wich ways) if swap goes havoc.

In general, everything you type in as C code (.bss, .data, .text) should be
unswappable. kmalloc()ed areas are resident too, and kmalloc has a
parameter which defines whether the allocation can/cannot push userspace
pages into the swap (GFP_ATOMIC/GFP_IO). So if there is some
kernel-allocation swapped out, it is most likely to be marked as
'userspace' so that the same algorithms can be used for swapin and -out.


Jan Engelhardt
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VGER BF report: H 5.48632e-07
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