Chandra Seetharaman wrote: [snip] >>>> The question is - whether web server is multithreaded or not... >>>> If it is not - then no problem here, you can change current >>>> context and new resources will be charged accordingly. >>>> >>>> And current BC code is _able_ to handle it with _minor_ changes. >>>> (One just need to save bc not on mm struct, but rather on vma struct >>>> and change mm->bc on set_bc_id()). >>>> >>>> However, no one (can some one from CKRM team please?) explained so far >>>> what to do with threads. Consider the following example. >>>> >>>> 1. Threaded web server spawns a child to serve a client. >>>> 2. child thread touches some pages and they are charged to child BC >>>> (which differs from parent's one) >>>> 3. child exits, but since its mm is shared with parent, these pages >>>> stay mapped and charged to child BC. >>>> >>>> So the question is: what to do with these pages? >>>> - should we recharge them to another BC? >>>> - leave them charged? >>>> >>>> >>> Leave them charged. It will be charged to the appropriate UBC when they >>> touch it again. >>> >>> >> Do you mean that page must be re-charged each time someone touches it? >> > > What I meant is that to leave them charged, and if when they are > ummapped and mapped later, charge it to the appropriate BC. > In this case multithreaded apache that tries to serve each domain in separate BC will fill the memory with BC-s, held by pages allocated and mapped in threads.
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