Messages in this thread | | | Date | Mon, 23 Apr 2001 18:27:23 -0500 | From | Bob McElrath <> | Subject | Re: generic rwsem [Re: Alpha "process table hang"] |
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Andrea Arcangeli [andrea@suse.de] wrote: > On Thu, Apr 19, 2001 at 11:21:17AM -0500, Bob McElrath wrote: > > I'm at 2 days uptime now, and have not seen the process-table-hang. > > Looks like this fixed it. Previously I would get a hang in the first > > day or so. I'm using your alpha-numa-3 and rwsem-generic-4 against > > 2.4.4pre3. > > good, thanks for the report. > > BTW, if you upgrade to 2.4.4pre4 you can apply those two patches: > > ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.4pre4aa1/00_alpha-numa-4 > ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.4pre4aa1/00_rwsem-generic-6 > > really the first is not necessary anymore unless you're using a wildfire. The > second also resurrect the optimized rwsemaphores for all archs but alpha and > ia32.
Well, take that back, I just got it to hang. Again, this is 2.4.4pre3 with alpha-numa-3 and rwsem-generic-4. I saw it upon starting mozilla. I also saw some scary filesystem errors that may or may not be related: Apr 23 18:09:40 draal kernel: EXT2-fs error (device sd(8,2)): ext2_new_block: Free blocks count corrupted for block group 252
There has been a lot of discussion on the topic of rwsems (that, admittedly, I haven't followed very closely). It looks like rwsem-generic-6 is the latest from Andrea, I'll build a new 2.4.4pre4 kernel with these patches and let you know the results. Have you made changes between rwsem-generic-4 and rwsem-generic-6 that would fix/prevent a deadlock?
Let me know if there are any useful tests I could perform. Would it be useful for me to run the rwsem benchmarks you've been using? Could these detect a deadlock situation?
Cheers, -- Bob
Bob McElrath (rsmcelrath@students.wisc.edu) Univ. of Wisconsin at Madison, Department of Physics [unhandled content-type:application/pgp-signature] | |