Messages in this thread |  | | Subject | Re: Deadlock on the mm->mmap_sem | Date | Thu, 20 Sep 2001 08:05:57 +0100 | From | David Howells <> |
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Andrea Arcangeli <andrea@suse.de> wrote: > yes, one solution to the latency problem without writing the > ugly code would be simply to add a per-process counter to pass to a > modified rwsem api, then to hide the trickery in a mm_down_read macro. > such way it will be recursive _and_ fair.
You'd need a counter per-process per-mm_struct. Otherwise you couldn't do a recursive read lock simultaneously in two or more different processes, and also allow any one process to lock multiple mm_structs.
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