On Mon, Jul 23, 2012 at 02:38:16PM +0100, Mel Gorman wrote: > commit 938929f14cb595f43cd1a4e63e22d36cab1e4a1f upstream. > > Stable note: Fixes https://bugzilla.novell.com/show_bug.cgi?id=726210 . > Large machines with 1TB or more of RAM take a long time to boot > without this patch and may spew out soft lockup warnings. In comparing this with the upstream version, you have a few different coding style differences, but no real content difference. Why? > > When min_free_kbytes is updated blocks marked MIGRATE_RESERVE are > updated. Ordinarily, this work is unnoticable as it happens early > in boot. However, on large machines with 1TB of memory, this can take > a considerable time when NUMA distances are taken into account. The bulk > of the work is done by pageblock_is_reserved() which examines the > metadata for almost every page in the system. Currently, we are doing > this far more than necessary as it is only required while there are > still blocks to be marked MIGRATE_RESERVE. This patch significantly > reduces the amount of work done by setup_zone_migrate_reserve() > improving boot times on 1TB machines. > > [akpm@xxxxxxxxxxxxxxxxxxxx: coding-style fixes] I'm guessing you didn't pick these up? Anyway, I've taken it now as the original one from Linus's tree, hopefully this doesn't burn me later in the series... thanks, greg k-h -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>