Hi patrick :) On Thu, Nov 10, 2011 at 14:43, Patrick Simmons <[email protected]> wrote: > I'm looking into the Linux memory management subsystem and need to know > when freed pages are zeroed. Specifically, are they zeroed just before > they are reallocated, immediately after they are freed, or sometime > in-between? Also, what files/functions would I need to modify to change > this behavior?
I vaguely recall that zeroing is done in (re)-allocation. Thus, during freeing pages, you just mark it as free and let the allocator handle it further (perhaps doing block combining--forgot the technical name). The function that does allocation while zeroing IIRC is kzalloc. PS: IIRC too, once zero-ing isn't done anywhere. But later, it is found that it could be a security issue since it might leak sensitive data. -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com _______________________________________________ Kernelnewbies mailing list [email protected] http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
