Hi :) 2011/10/13 Ezequiel García <elezegarcia@xxxxxxxxxxxx>: > > --- El jue 13-oct-11, Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx> escribió: > >> this is what I am not clear, do those 10 threads allocate 8 >> MB each? >> or 8 MB total? remember that threads share address space by >> default... >> > > I am sorry maybe I explained myself incorrectly, threads don't actually > allocate anything; just mmap it's own stack space (8MB each). I see, so 8 MB each.... and since you created 10 threads, I suppose that would commit 8*10=80 MB of RAM. CMIIW here.... (stack are individual, so they aren't shared between threads) > I looked at the link you provided me and I found this: > > http://lxr.linux.no/linux+v3.0.4/mm/mmap.c#L112 > > mmap.c, line 112: vm_enough_memory() > > It seems here is where the mm subsystem decides to fail with ENOMEM > and uses commit parameters to decide... I found it most interesting. I agree....as you can see there, there is some percentage of VM preserved for root...also for hugetlb etc. -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
