Messages in this thread | | | Date | Sun, 10 Jan 2010 10:57:34 +0530 | From | Nitin Gupta <> | Subject | Re: [RFC][PATCH 6/8] mm: handle_speculative_fault() |
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On 01/09/2010 08:17 PM, Ed Tomlinson wrote: > On Friday 08 January 2010 11:53:30 Peter Zijlstra wrote: >> On Tue, 2010-01-05 at 20:20 -0800, Linus Torvalds wrote: >>> >>> On Wed, 6 Jan 2010, KAMEZAWA Hiroyuki wrote: >>>>> >>>>> Of course, your other load with MADV_DONTNEED seems to be horrible, and >>>>> has some nasty spinlock issues, but that looks like a separate deal (I >>>>> assume that load is just very hard on the pgtable lock). >>>> >>>> It's zone->lock, I guess. My test program avoids pgtable lock problem. >>> >>> Yeah, I should have looked more at your callchain. That's nasty. Much >>> worse than the per-mm lock. I thought the page buffering would avoid the >>> zone lock becoming a huge problem, but clearly not in this case. >> >> Right, so I ran some numbers on a multi-socket (2) machine as well: >> >> pf/min >> >> -tip 56398626 >> -tip + xadd 174753190 >> -tip + speculative 189274319 >> -tip + xadd + speculative 200174641 > > Has anyone tried these patches with ramzswap? Nitin do they help with the locking > issues you mentioned? >
Locking problem with ramzswap seems completely unrelated to what is being discussed here.
Thanks, Nitin
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