Linus Torvalds wrote:
On Sat, 22 Feb 2003, Keith Whitwell wrote:
What about processes that *don't* do a close - that just use an fd and exit.
The exit does a close, and you'll see a flush() from the dying process (and a release() if that was the last user).
In the threaded demo I'm looking at, there is only one close -- in the same thread that did the open. The other threads just die.
If a thread does a close(), then that will have closed it in the other threads too. You will not get any notification from the other threads, since they will never have anything to notify about - the file is already dead as far as they are concerned.
But sadly for me, the thread that does the open isn't the one that sees the flush() or release() events:
Whoever does the close() generates the flush().
And the release() can be generated by anybody, although in practice it's going to be the same one that did the final flush() in 99.99% of all cases (but if you depend on it, you're just asking for trouble).
The last line indicates that 1063 held the lock. I never see a flush() for that pid.
The answer really is that you shouldn't care about the pid at all.
OK, here's a patch, first attempt at doing this. It's not ready to commit yet, unless we start a branch for this...
Things actually work pretty well, and a couple of lockups seem to have disappeared as a result. There are at least two issues:
1) Hard lockup when the X server recycles. 2) This breaks other OS's -- they'll need to play catchup, I think.
otherwise, I'm interested in feedback.
Keith
I have applied this to my 2.5.63 kernel. The quake3-smp segfault is gone. :-)
I can't give any feedback wrt issue 1 since my X server can not recycle. :-(
(There is a problem with the Radeon driver after it has initialised the card itself, rather than the BIOS on start-up. The V_BIOS isn't available for subsequent Xserver starts and the PLL settings are _very_ wrong. Perhaps it restores an invalid pre-initialised state to the card on exit?)
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