<quote sender="Ed L Cashin"> > Arjan van de Ven <arjanv@redhat.com> writes: > > > On Fri, 2004-03-05 at 19:25, Ed L Cashin wrote: > >> Hi. I read somewhere that seemed authoritative (unfortunately I > >> forget where) that you could use the rmap stuff to get both the > >> mm_struct pointer and the task_struct pointer associated with a PTE > >> given that PTE. > >> > >> I see in mm/rmap.c:try_to_unmap_one that you can use ptep_to_mm to get > >> the mm. I think it's pretty neat: the mm pointer is hidden in the > >> mapping field of the page struct describing the page where the pte > >> lives. > > > > there is a fundamental issue wrt task_struct: there can be *many* of > > those for any given PTE, since tasks can (and do in the case of threads) > > share the mm. > > I should have mentioned that I know that multiple threads can share an > mm. The question is more general: how to get the owner(s) of the mm. what i did is to check the clone_flags, and note which tasks share or do not share the same mm_struct. now, the thing you have to figure out is to find out how to get the owners in the first place, but i guess you already figured that one out. Eugene > > -- > --Ed L Cashin | PGP public key: > ecashin@uga.edu | http://noserose.net/e/pgp/ > > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > > -- Eugene TEO - <eugeneteo%null!cc!uic!edu> <http://www.anomalistic.org/> 1024D/14A0DDE5 print D851 4574 E357 469C D308 A01E 7321 A38A 14A0 DDE5 main(i) { putchar(182623909 >> (i-1) * 5&31|!!(i<7)<<6) && main(++i); } -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
