On Thu, 2011-02-17 at 17:23 +0100, Peter Zijlstra wrote: > s390 wants a bit more, but more on that in another email. So what s390 wants is something like the below, where a fullmm gather flushes a-priory and then simply gathers and frees the pages. I can't see why something like this shouldn't work on x86 and power (the only two archs I really looked in depth at), but it certainly is something that needs a close look. --- Index: linux-2.6/include/asm-generic/tlb.h =================================================================== --- linux-2.6.orig/include/asm-generic/tlb.h +++ linux-2.6/include/asm-generic/tlb.h @@ -145,7 +145,10 @@ tlb_gather_mmu(struct mmu_gather *tlb, s tlb->need_flush = 0; if (num_online_cpus() == 1) tlb->fast_mode = 1; + tlb->fullmm = full_mm_flush; + if (tlb->fullmm) + tlb_flush(tlb); tlb->local.next = NULL; tlb->local.nr = 0; @@ -162,13 +165,15 @@ tlb_flush_mmu(struct mmu_gather *tlb) { struct mmu_gather_batch *batch; - if (!tlb->need_flush) - return; - tlb->need_flush = 0; - tlb_flush(tlb); + if (tlb->need_flush && !tlb->fullmm) { + tlb_flush(tlb); + tlb->need_flush = 0; + } + #ifdef CONFIG_HAVE_RCU_TABLE_FREE tlb_table_flush(tlb); #endif + if (tlb_fast_mode(tlb)) return; -- 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