On Tue, Mar 22, 2011 at 03:34:10PM -0500, Alex Villacís Lasso wrote: > I have just tested aa.git as of today, with the USB stick formatted > as FAT32. I could no longer reproduce the stalls. There was no need > to format as ext4. No /proc workarounds required. Sounds good. So Andrew the patches to apply to solve this most certainly are: http://userweb.kernel.org/~akpm/mmotm/broken-out/mm-compaction-minimise-the-time-irqs-are-disabled-while-isolating-pages-for-migration.patch http://userweb.kernel.org/~akpm/mmotm/broken-out/mm-compaction-minimise-the-time-irqs-are-disabled-while-isolating-pages-for-migration-fix.patch http://userweb.kernel.org/~akpm/mmotm/broken-out/mm-compaction-minimise-the-time-irqs-are-disabled-while-isolating-free-pages.patch http://git.kernel.org/?p=linux/kernel/git/andrea/aa.git;a=patch;h=6daf7ff3adc1a243aa9f5a77c7bde2b713a3188a (not in -mm, posted to linux-mm Message-ID 20110321134832.GC5719) Very likely it's the combination of all the above that is equally important and needed for this specific compaction issue. ==== rest of aa.git not relevant for this bugreport below ==== http://userweb.kernel.org/~akpm/mmotm/broken-out/mm-compaction-prevent-kswapd-compacting-memory-to-reduce-cpu-usage.patch http://userweb.kernel.org/~akpm/mmotm/broken-out/mm-vmscan-kswapd-should-not-free-an-excessive-number-of-pages-when-balancing-small-zones.patch http://git.kernel.org/?p=linux/kernel/git/andrea/aa.git;a=patch;h=cb107ebbb7541e5442fd897436440e71835b6496 (not in -mm posted to linux-mm Message-ID: alpine.LSU.2.00.1103192318100.1877) http://userweb.kernel.org/~akpm/mmotm/broken-out/mm-add-__gfp_other_node-flag.patch http://userweb.kernel.org/~akpm/mmotm/broken-out/mm-add-__gfp_other_node-flag-checkpatch-fixes.patch http://userweb.kernel.org/~akpm/mmotm/broken-out/mm-use-__gfp_other_node-for-transparent-huge-pages.patch http://userweb.kernel.org/~akpm/mmotm/broken-out/mm-use-__gfp_other_node-for-transparent-huge-pages-checkpatch-fixes.patch http://userweb.kernel.org/~akpm/mmotm/broken-out/mm-add-vm-counters-for-transparent-hugepages.patch http://userweb.kernel.org/~akpm/mmotm/broken-out/mm-add-vm-counters-for-transparent-hugepages-checkpatch-fixes.patch smaps* (5 patches in -mm) This is one experimental new feature that should improve mremap significantly regardless of THP on or off (but bigger boost with THP on). I'm using it for weeks without problem, I'd suggest it for inclusion too. The version in the below link is the most uptodate. It fixes a build trouble (s/__split_huge_page_pmd/split_huge_page_pmd/ in move_page_tables) with CONFIG_TRANSPARENT_HUGEPAGE=n compared to the last version I posted to linux-mm. But this is low priority. http://git.kernel.org/?p=linux/kernel/git/andrea/aa.git;a=patch;h=0e6f8bd8802c3309195d3e1a7af50093ed488f2d -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>