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> Alan Cox <alan@lxorguk.ukuu.org.uk> writes: > > >>Ar Maw, 2006-08-15 am 12:23 -0600, ysgrifennodd Eric W. Biederman: >>>>>This keeps the wrong process from being notified if the >>>daemon to spawn a new console dies.>>>>Not sure why we count pids not task structs but within the proposed >>implementation this appears correct so > > > Basically struct pid is relatively cheap, 64bytes or so. > struct task is expensive 10K or so, when all of the stacks > and everything are included. > > Counting pids allows the task to exit in user space and free up > all of it's memory. > > When /proc used to count the task struct it was fairly easy to > deliberately oom a 32bit machine just by open up directories in > /proc and then having the process exit. rlimits didn't help because > we don't count processes that have exited. hey, hey. your patch doesn't help in this situation (much)! inodes and dentries can still consume much memory. it just makes the situation a bit better. I wonder whether it is easy to have the following done with your implementation: container tasks visible from host. theoretically having 2 pids (vpid, pid) it should be implementable. Do you see any obstacles? in other regards patches look pretty good. Good job! Kirill - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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