Michal Suchanek, le Wed 19 Mar 2008 16:55:48 +0100, a écrit : > On 19/03/2008, Samuel Thibault <[EMAIL PROTECTED]> wrote: > > Yes, that's what I meant actually: the diskfs_sync_everything() function > > is able to trigger a lot of thread creations. > > > > A way to have things work correctly would be by marking threads with a > > "level", i.e. diskfs_sync_everything runs at level 0, threads that it > > generates run at level 1, and threads that process their page faults run > > at level 2, etc. Then we just need to limit the number of threads for a > > given level. That should always permit termination of requests, while > > still limiting the number of thread to a constant times the maximum > > nesting of page faults. > > How would you increase the level?
The kernel would have to transmit it from the page fault to the memory object request. > Would that mean that some initial process is level 1, login level 2, a > user process started from top level shell level 3, from window manager > level n >> 3? No, it's not related to processes, but to threads servicing memory object requests. > Or does the level increase only when the thread goes through some page > fault port? The level doesn't really increase, it's just that the thread servicing a page fault inherits the original thread's level plus one. > How many levels can result from this? The maximum nesting of page faults. Samuel
