Messages in this thread | | | Date | Fri, 17 Dec 1999 18:14:13 +0100 (CET) | From | Ingo Molnar <> | Subject | Re: VFS?VM - mmap/write deadlock |
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On Fri, 17 Dec 1999, Eleonora Autore wrote:
> I remember very vaguely Alexander Viro mentioning some easily > reproducible deadlock when doing mmap followed by write in some > specific sequence (or a page cache in some specific state?). > > Can you please remind me of the scenario - weekend is at hand and one > needs to do something about it.
actually it was originally noticed by David Miller and mentioned by me :) The deadlock scenario is when you:
ptr = mmap(file, 4096, 0) write (file, ptr, 4096);
the write() generates a pagefault which deadlocks on the page lock. (the process gets 'stuck'.)
the goal is to fix this completely pointless situation in a way that does not slow down normal usage.
-- mingo
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