Messages in this thread | | | Date | Wed, 16 Aug 2006 22:57:26 -0700 | From | Andrew Morton <> | Subject | Re: [RFC][PATCH 2/9] deadlock prevention core |
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On Wed, 16 Aug 2006 20:58:28 -0700 Daniel Phillips <phillips@google.com> wrote:
> Andrew Morton wrote: > > Peter Zijlstra <a.p.zijlstra@chello.nl> wrote: > >>Testcase: > >> > >>Mount an NBD device as sole swap device and mmap > physical RAM, then > >>loop through touching pages only once. > > > > Fix: don't try to swap over the network. Yes, there may be some scenarios > > where people have no local storage, but it's reasonable to expect anyone > > who is using Linux as an "enterprise storage platform" to stick a local > > disk on the thing for swap. > > > > That leaves MAP_SHARED, but mm-tracking-shared-dirty-pages.patch will fix > > that, will it not? > > Hi Andrew, > > What happened to the case where we just fill memory full of dirty file > pages backed by a remote disk? >
Processes which are dirtying those pages throttle at /proc/sys/vm/dirty_ratio% of memory dirty. So it is not possible to "fill" memory with dirty pages. If the amount of physical memory which is dirty exceeds 40%: bug. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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