Hi Dave, et al.,
I have this little problem. I am trying to get a lustre file system
extension working again. It used to work, but does no more.
It first calls is_page_ptr(kvaddr, &kpaddr) to convert a virtual
address into a physical address, and then calls:
> readmem(kpaddr, PHYSADDR, buf, used,
> "trace page data", RETURN_ON_ERROR)
to fetch the bytes. Updating the release to SLES-11 SP2 causes
this to now fail. In my debugging of crash/gdb, this:
> is_page_ptr (addr=18446719884937843744, phys=0x7fffffffd370) at memory.c:11448
> 11448 if (IS_SPARSEMEM()) {
> (gdb) p/x addr
> $8 = 0xffffea001cdad420
is about to fail. However, this:
> crash> gdb x/4xg 0xffffea001cdad420
works just fine. I've stepped through x_command until it gets to
x86_64_kvtop() where I'm finding the logic a little twisty.
But it pretty clearly does not rely on section_mem_map_addr() stuff.
So, here's my point: this is confusing. What should I look for
to determine why "is_page_ptr()" is saying 0xffffea001cdad420
is invalid while "x86_64_kvtop()" is saying that it is and its
physical address is 0x87afad420?
> 878 return(readmem(addr, memtype, buf, len,
> (gdb) s
> readmem (addr=0xffffea001cdad420, memtype=0x1, buffer=0x5d85d10, size=0x8,
> type=0x945f0a "gdb_readmem_callback", error_handle=0x2) at memory.c:1991
>
> 0xffffea001cdad420: PML4 DIRECTORY: ffffffff81623000
> PAGE DIRECTORY: 87fff7067
> PUD: 87fff7000 => 87fff6067
> PMD: 87fff6730 => 800000087ae001e3
> PAGE: 87ae00000 (2MB)
> PTE PHYSICAL FLAGS
> 800000087ae001e3 87ae00000 (PRESENT|RW|ACCESSED|DIRTY|PSE|GLOBAL|NX)
> (gdb) p physpage
> $34 = 0x87afad420
0xffffea001cdad420: 0x0200000000000000 0xffffffff00000001
0xffffea001cdad430: 0x0000000000000000 0x0000000000000000
Help, please? Thank you!
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