On Fri, Oct 04, 2002 at 01:08:01PM +0200, R!SC wrote: > what is active_mm field in task_struct? > it's often used in schedule alghoritm. active_mm contains the active user-space virtual memory mappings. For "normal" tasks, mm == active_mm. For kernel tasks, though, they don't care about user-space mappings, so instead of fully flushing page tables etc., active_mm is set to the previous task's (the one being scheduled out) mm (see context_switch), and the mm's mm_count is incremented in case the other "real" users of the mm (mm_users) die. task->mm is NULL for kernel threads. This is very rough, and doesn't seem quite right. I don't know quite what effect TLBSTATE_LAZY actually has on i386 (it only seems to affect SMP which I don't follow ...) With any luck, somebody who has a clue about this can comment regards john -- "Me and my friends are so smart, we invented this new kind of art: Post-modernist throwing darts" - the Moldy Peaches -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
