Hi Konstantin, I modified our code to check for the map-exclusive flag where it used to compare pageframe numbers. First tests look pretty promising, so this patch looks like a viable approach for us. Is there anything further we can do to help? Thanks, Mark On Tue, May 12, 2015 at 12:13 PM, Mark Williamson <mwilliamson@xxxxxxxxxxxxxxxxx> wrote: > Hi Konstantin, > > Thanks very much for continuing to look at this! It's very much > appreciated. I've been investigating from our end but got caught up > in some gnarly details of our pagemap-consuming code. > > I like the approach and it seems like the information you're exposing > will be useful for our application. I'll test the patch and see if it > works for us as-is. > > Will follow up with any comments on the individual patches. > > Thanks, > Mark > > On Tue, May 12, 2015 at 10:43 AM, Konstantin Khlebnikov > <khlebnikov@xxxxxxxxxxxxxx> wrote: >> This patchset tries to make pagemap useable again in the safe way. >> First patch adds bit 'map-exlusive' which is set if page is mapped only here. >> Second patch restores access for non-privileged users but hides pfn if task >> has no capability CAP_SYS_ADMIN. Third patch removes page-shift bits and >> completes migration to the new pagemap format (flags soft-dirty and >> mmap-exlusive are available only in the new format). >> >> --- >> >> Konstantin Khlebnikov (3): >> pagemap: add mmap-exclusive bit for marking pages mapped only here >> pagemap: hide physical addresses from non-privileged users >> pagemap: switch to the new format and do some cleanup >> >> >> Documentation/vm/pagemap.txt | 3 - >> fs/proc/task_mmu.c | 178 +++++++++++++++++------------------------- >> tools/vm/page-types.c | 35 ++++---- >> 3 files changed, 91 insertions(+), 125 deletions(-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>