Messages in this thread | | | Date | Thu, 19 Jun 2008 16:31:55 -0400 | From | "Ryan Hope" <> | Subject | Re: [BUG] Lockless patches cause hardlock under heavy IO |
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This seems to be hardlocking on anyone that has a 64bit processor, the only one who this has not locked on yet has a 32bit processor. I hope that helps, its the best I can come up with so far.
-Ryan
On Thu, Jun 19, 2008 at 4:19 AM, Nick Piggin <nickpiggin@yahoo.com.au> wrote: > On Thursday 19 June 2008 18:12, Peter Zijlstra wrote: >> On Wed, 2008-06-18 at 17:15 -0400, Ryan Hope wrote: >> > I applied the following patches from 2.6-26-rc5-mm3 to 2.6.26-rc6 and >> > they caused a hardlock under heavy IO: >> >> What kind of machine, how much memory, how many spindles, what >> filesystem and what is heavy load? >> >> Furthermore, try the NMI watchdog with serial/net-console to capture its >> output. > > > Good suggestions. A trace would be really helpful. > > As Arjan suggested, debug options especially CONFIG_DEBUG_VM would be > a good idea to turn on if you haven't already. > > BTW. what was the reason for applying those patches? Did you hit the > problem with -mm also, and hope to narrow it down? > > >> > x86-implement-pte_special.patch >> > mm-introduce-get_user_pages_fast.patch >> > mm-introduce-get_user_pages_fast-fix.patch >> > mm-introduce-get_user_pages_fast-checkpatch-fixes.patch >> > x86-lockless-get_user_pages_fast.patch >> > x86-lockless-get_user_pages_fast-checkpatch-fixes.patch >> > x86-lockless-get_user_pages_fast-fix.patch >> > x86-lockless-get_user_pages_fast-fix-2.patch >> > x86-lockless-get_user_pages_fast-fix-2-fix-fix.patch >> > x86-lockless-get_user_pages_fast-fix-warning.patch >> > dio-use-get_user_pages_fast.patch >> > splice-use-get_user_pages_fast.patch >> > x86-support-1gb-hugepages-with-get_user_pages_lockless.patch >> > # >> > mm-readahead-scan-lockless.patch >> > radix-tree-add-gang_lookup_slot-gang_lookup_slot_tag.patch >> > #mm-speculative-page-references.patch: clameter saw bustage >> > mm-speculative-page-references.patch >> > mm-speculative-page-references-fix.patch >> > mm-speculative-page-references-fix-fix.patch >> > mm-speculative-page-references-hugh-fix3.patch >> > mm-lockless-pagecache.patch >> > mm-spinlock-tree_lock.patch >> > powerpc-implement-pte_special.patch >> > >> > I am on an x86_64. I dont know what other info you need... > > Can you isolate it to one of the two groups of patches? I suspect it > might be the latter so you might try that first -- this version of > speculative page references is very nice in theory but it is a little > more complex to implement the slowpaths so it could be an error there. >
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