On Mon, 14 Aug 2006 07:03:55 +0200 Peter Zijlstra <[EMAIL PROTECTED]> wrote:
> On Sun, 2006-08-13 at 21:58 -0700, Andrew Morton wrote: > > On Mon, 14 Aug 2006 06:40:53 +0200 > > Peter Zijlstra <[EMAIL PROTECTED]> 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. > > I wish you were right, however there seems to be a large demand to go > diskless and swap over iSCSI because disks seem to be the nr. 1 failing > piece of hardware in systems these days. We could track dirty anonymous memory and throttle. Also, there must be some value of /proc/sys/vm/min_free_kbytes at which a machine is no longer deadlockable with any of these tricks. Do we know what level that is? > > That leaves MAP_SHARED, but mm-tracking-shared-dirty-pages.patch will fix > > that, will it not? > > Will makes it less likely. One can still have memory pressure, the > remaining bits of memory can still get stuck in socket queues for > blocked processes. But there's lots of reclaimable pagecache around and kswapd will free it up? - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
