This is hopefully the final version that was agreed on. Ingo, you had sent an ack but I had to add a new arch helper after that for accounting purposes and there was a new patch added for the swap cluster suggestion. With the changes I did not include the ack just in case it was no longer valid. Changelog since V6 o Rebase to v4.2-rc1 o Fix TLB flush counter accounting o Drop dynamic allocation patch, no benefit and very messy o Drop targetting flushing, expected to be of dubious merit o Increase swap cluster max Changelog since V5 o Split series to first do a full TLB flush and then targetting flushing Changelog since V4 o Rebase to 4.1-rc6 Changelog since V3 o Drop batching of TLB flush from migration o Redo how larger batching is managed o Batch TLB flushes when writable entries exist When unmapping pages it is necessary to flush the TLB. If that page was accessed by another CPU then an IPI is used to flush the remote CPU. That is a lot of IPIs if kswapd is scanning and unmapping >100K pages per second. There already is a window between when a page is unmapped and when it is TLB flushed. This series ses the window so multiple pages can be flushed using a single IPI. This should be safe or the kernel is hosed already. Patch 1 simply made the rest of the series easier to write as ftrace could identify all the senders of TLB flush IPIS. Patch 2 tracks what CPUs potentially map a PFN and then sends an IPI to flush the entire TLB. Patch 3 tracks when there potentially are writable TLB entries that need to be batched differently Patch 4 increases SWAP_CLUSTER_MAX to further batch flushes The performance impact is documented in the changelogs but in the optimistic case on a 4-socket machine the full series reduces interrupts from 900K interrupts/second to 60K interrupts/second. arch/x86/Kconfig | 1 + arch/x86/include/asm/tlbflush.h | 6 +++ arch/x86/mm/tlb.c | 1 + include/linux/mm_types.h | 1 + include/linux/rmap.h | 3 ++ include/linux/sched.h | 23 ++++++++ include/linux/swap.h | 2 +- include/trace/events/tlb.h | 3 +- init/Kconfig | 10 ++++ mm/internal.h | 15 ++++++ mm/rmap.c | 117 +++++++++++++++++++++++++++++++++++++++- mm/vmscan.c | 30 ++++++++++- 12 files changed, 207 insertions(+), 5 deletions(-) -- 2.3.5 -- 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>