On Wed, 2009-04-01 at 17:18 -0600, Chris Friesen wrote: > Resending due to lack of response to original post.
Hi Chris, You'll probably get a more useful response on lkml. You CC'ed linux-kernel-owner originally :) > I was validating some code dealing with /proc/<pid>/maps on 2.6.29 and > was surprised when it failed. It turns out that at least on my ppc64 G5 > machine the offset value for the last entry is strange--it shows up as a > 64-bit value even though the process itself is only 32-bit. > > This behaviour also shows up in 2.6.25, but doesn't in 2.6.14. I > haven't yet tested anything else in between. > > [cfrie...@localhost cfriesen]$ cat /proc/self/maps > 00100000-00103000 r-xp 00100000 00:00 0 [vdso] > 0fe70000-0ffbf000 r-xp 00000000 08:03 4312393 /lib/tls/libc-2.3.3.so > 0ffbf000-0ffc0000 ---p 0014f000 08:03 4312393 /lib/tls/libc-2.3.3.so > 0ffc0000-0ffc2000 r--p 00150000 08:03 4312393 /lib/tls/libc-2.3.3.so > 0ffc2000-0ffc6000 rwxp 00152000 08:03 4312393 /lib/tls/libc-2.3.3.so > 0ffc6000-0ffc8000 rwxp 0ffc6000 00:00 0 > 0ffd0000-0ffec000 r-xp 00000000 08:03 4309011 /lib/ld-2.3.3.so > 0fff0000-0fff1000 r--p 00020000 08:03 4309011 /lib/ld-2.3.3.so > 0fff1000-0fff2000 rwxp 00021000 08:03 4309011 /lib/ld-2.3.3.so > 10000000-10004000 r-xp 00000000 08:03 917536 /bin/cat > 10013000-10015000 rwxp 00003000 08:03 917536 /bin/cat > 10015000-10036000 rwxp 10015000 00:00 0 [heap] > f7deb000-f7feb000 r--p 00000000 08:03 2560322 > /usr/lib/locale/locale-archive > f7feb000-f7fec000 rw-p f7feb000 00:00 0 > ffe6d000-ffe82000 rw-p ffffffeb000 00:00 0 [stack] > > I'm at a loss to explain what's going on here. Anyone got any ideas? It looks like for vmas that don't have a vm_file (like the stack), vm_pgoff is basically "internal use" - and so can be > 32 bit. cheers -- Michael Ellerman OzLabs, IBM Australia Development Lab wwweb: http://michael.ellerman.id.au phone: +61 2 6212 1183 (tie line 70 21183) We do not inherit the earth from our ancestors, we borrow it from our children. - S.M.A.R.T Person
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